Table of Contents
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Table of Contents
Related Manuals for Mercedes-Benz OM 904 LA
Summary of Contents for Mercedes-Benz OM 904 LA
- Page 1 ® OM 904-926 LA BlueTec , OM 904-926 LA Operating Instructions...
- Page 2 Symbols Warning Environmental note Possible vehicle/equipment dam- Instructions Continuation symbol (Y page) Page reference...
- Page 3 Welcome to the world of Mercedes-Benz Familiarise yourself with your engine and read the Operating Instructions before you use the engine. This will help you to avoid endanger- ing yourself or others. The standard equipment and product descrip- tion of your engine may vary, depending on individual specifications.
- Page 5 Contents Index ............4 At a glance ........... 13 Introduction ........... 7 Safety ........... 29 Driving mode/working mode ..... 33 Maintenance and care ......47 Notes on maintenance ....... 59 Decommission and protection ... 79 Breakdown assistance ....... 85 Technical data ........99...
- Page 6 Index Cooling system Degreasing ........77 Adaptation module ......21 Flushing ........... 77 ® AdBlue /DEF Correct use ..........9 Components ........19 Corrosion inhibitor/antifreeze Consumption ........43 agent ............ 50 Refuelling ......... 44 Cranking device ........64 Replacing the filter ......70 Service product .......
- Page 7 ..........23 Maintenance Exhaust gas aftertreatment indica- Notes ..........57 tor lamp ..........95 Mercedes-Benz Service Centre see Qualified specialist workshop Modifications and changes ....7 Filling up the pressure reservoir ..72 MR control unit FR (drive control) unit...
- Page 8 Index Operating restriction override ... 40 Diesel fuel ........51 Operating safety ........7 Disposal ........... 48 Operational monitoring ...... 38 ® Disposing of AdBlue /DEF ....55 Organisational measures ....30 Engine oil ......... 48 Original parts ......... 7 FAME fatty acid methyl ester fuel ..
- Page 9 Introduction Environmental note Therefore, please follow the engine operating instructions included in the Owner's Manual. Environmental note WARNING Daimler AG has a declared policy of compre- Faulty or incomplete maintenance work, as hensive environmental protection. well as disregarded maintenance intervals, The objective is to use resources sparingly can decrease the engine's operating life, and in a manner that takes natural resources...
- Page 10 Mercedes-Benz or MTU Service Centre page 11). Always state the engine number with the model designation when ordering genuine Mercedes-Benz parts. You can find the num- bers on the identification plate of your engine...
- Page 11 DEF in order to meet the emissions laws and The engine may not be modified. If the engine regulations. is modified, Mercedes-Benz and MTU do not accept responsibility for any damage arising The operating permit is invalidated if the vehi- as a result.
- Page 12 The Operating Instructions contains informa- tion required for installation in the "Technical Data" section" ( page 101). Please consult a Mercedes-Benz or MTU Example display for OM 457 hLA Service Centre ( page 11) if you have any The engine may only be lifted using a beam/ questions.
- Page 13 Maintenance work does not include repair work. Repair work requires a separate order. You may also consult a Mercedes-Benz or MTU Service Centre for further information. Qualified specialist workshop A qualified specialist workshop has the nec-...
- Page 15 Exterior view ........14 General information ......21...
- Page 16 Exterior view Exterior view Engine overview Engine overview: OM 904 LA Engine oil filler neck Stop button Start button Air compressor Power-steering pump Engine control unit (MR) Dipstick Refrigerant compressor Poly V-belt tensioning device Coolant pump Fuel prefilter Fuel filter...
- Page 17 Exterior view Engine overview: OM 904 LA ® AdBlue /DEF metering unit Charge-air pipe from the charge-air cooler Charge-air pipe to the charge-air cooler Engine ventilation hose Oil filter Poly V-belt tensioning device Alternator Starter motor Intake air inlet Engine brake...
- Page 18 Exterior view Engine overview: OM 906 LA Engine oil filler neck Stop button Start button Air compressor Power-steering pump Engine control unit (MR) Dipstick Refrigerant compressor Poly V-belt tensioning device Fuel filter Coolant pump Fuel prefilter Coolant outlet to the radiator...
- Page 19 Exterior view Engine overview: OM 906 LA ® AdBlue /DEF metering unit Charge-air pipe from the charge-air cooler Charge-air pipe to the charge-air cooler Engine ventilation hose Oil filter Poly V-belt tensioning device Alternator Starter motor Intake air inlet Exhaust gas turbocharger Engine brake...
- Page 20 Exterior view Sensors overview Sensors, general Example: OM 926 LA Oil temperature Oil pressure Coolant temperature Charge-air temperature/charge-air pressure Camshaft position sensor (on camshaft gear) Crankshaft position sensor (on flywheel) Oil level Fuel temperature...
- Page 21 Exterior view ® AdBlue /DEF components ® BlueTec sensors, overview: OM 924 LA ® Valve preheating, AdBlue /DEF system Exhaust aftertreatment unit Temperature and humidity sensor (air filter, clean air side) Metering unit Temperature sensor downstream of catalytic converter NOx sensor Temperature sensor upstream of catalytic converter Exhaust gas aftertreatment control unit Supply unit...
- Page 22 Exterior view ® BlueTec sensors, overview: OM 926 LA ® Valve preheating, AdBlue /DEF system Exhaust aftertreatment unit Temperature and humidity sensor (air filter, clean air side) Metering unit Temperature sensor downstream of catalytic converter NOx sensor Temperature sensor upstream of catalytic converter Exhaust gas aftertreatment control unit Supply unit ®...
- Page 23 General information ® Example: BlueTec sensors and test connection on the metering unit ® AdBlue /DEF pressure sensor ® AdBlue /DEF temperature sensor Pressure sensor for compressed air Metering unit test connection Metering unit heater Metering valve pumps sit directly in the crankcase and are General information driven by the camshaft.
- Page 24 General information adaptation module (ADM). These are, for Electronic engine control unit example, the signal from the position sensor The engine has a fully electronic management (accelerator pedal), the engine brake or system which, along with the engine and its engine start/stop, etc.
- Page 25 General information The drive control (FR) unit or the adaptation module (ADM) receives data from: user (signal from the position sensor, engine Start/Stop) engine brake switch other systems (e.g. acceleration skid con- trol) engine management (MR) control unit (e.g. oil pressure and coolant temperature) Values for the engine management (MR) con- trol unit are derived from this and transferred via the CAN line.
- Page 26 ® a malfunction with the BlueTec exhaust gas aftertreatment system, have it checked and repaired at a qualified specialist workshop. Mercedes-Benz recommends that you use a Mercedes-Benz or MTU Service Centre for this purpose. ® BlueTec technology is one part of the engine homologation that requires certification.
- Page 27 General information ® BlueTec exhaust gas aftertreatment indicator and warning lamps Engine, general Reason for display/displayed message Symbol Malfunction Impermissible operating conditions lamp Text in the engine symbol: "CHECK" Stop lamp Severe fault Text in the engine symbol: "STOP" Malfunction in Lights up in the event of an electronic engine con- the electronic trol unit malfunction.
- Page 28 The constant throttle valves bring about a reduction of the compression pressure in the power stroke OM 904 LA/OM 924 LA constant throttle valve (third stroke), whilst the compression (sec- Constant throttle valve ond stroke) is not significantly affected.
- Page 29 Have the cold-start aid checked and repaired only at a qualified specialist workshop. Cold-start aid Mercedes-Benz recommends that you use a The cold-start aid makes it easier to start the Mercedes-Benz or MTU Service Centre for engine at low outside temperatures (below this purpose ( page 11).
- Page 31 Safety precautions ......30 Staff qualifications ......30 Organisational measures ....30...
- Page 32 Only use the appropriate testing probes When doing so, put special emphasis on when taking measurements from electri- safety-relevant information. This is particu- cal connectors (e.g. a Mercedes-Benz larly important for personnel that only work connection set). Telephones and two- occasionally on the engine.
- Page 33 Organisational measures Always keep the Operating Instructions and the Maintenance Booklet readily accessible, in the area of engine operation. In addition to the Operating Instructions, other general, country-specific, legal and other binding regulations on accident preven- tion and environmental protection must be adhered to.
- Page 35 Operation ..........34 Continuous brake ........ 41 Driving tips .......... 42 Refuelling ..........43 Winter operation ......... 45...
- Page 36 Sheet Num- possible with the engine switched off and the ber 225.6 of the Mercedes-Benz Specifica- ignition switched on. tions for Service Products. Park the vehicle/equipment on a horizontal These high-quality engine oils are beneficial surface.
- Page 37 Operation ® Refuelling with AdBlue /DEF ® Only use AdBlue /DEF that complies with DIN 70070/ISO 22241. Do not use any addi- ® tives. If AdBlue /DEF comes into contact with painted or aluminium surfaces, rinse the affected surfaces immediately with plenty of water.
- Page 38 Operation Check the engine for leaks. the coolant expansion tank are pressurised Check all hose fittings, hose clamps and when the engine is at normal operating tem- pipe connections on the engine, as well as perature. Wear gloves and eye protection. the oil feed and return on the exhaust gas Only open the coolant expansion tank when turbocharger, for leaks and correct seating.
- Page 39 Operation Wait approximately 1 minute each time before repeating the starting procedure. After three starting attempts, wait approx- imately three minutes each time before try- ing again. Observe the oil pressure gauge immedi- ately after having started the engine. Starting and stopping the engine with the Start/Stop button Switch on the ignition.
- Page 40 Operation speed. The engine speed can be increased Operational monitoring up to the limiting speed. Charge current To stop the engine: press Start/Stop but- ton : again. The charge current indicator lamp must go The engine switches off. out after the engine has started. Engine with two buttons Example: charge current indicator lamp If the # indicator lamp does not go out, or...
- Page 41 Operation Requirements for vehicles The engine output can be automatically reduced the first time the vehicle is stationary ® the AdBlue /DEF reservoir is empty the permitted thresholds for nitric oxide (NOx) emissions are exceeded Torque reduction ® If the AdBlue /DEF is used up or if there is a fault, the indicator lamp in the instrument Example: electronics warning lamp...
- Page 42 Operation Torque/time diagrams Major operating restriction The transition between a minor and a major ® AdBlue /DEF level low operating restriction is achieved by a gradual reduction in engine speed and torque. The engine torque is linearly reduced to 20% of the nominal value. At the same time, the engine speed is slowly reduced to 1000 rpm.
- Page 43 Continuous brake Recurring fault To switch off the engine: turn the vehicle key in the ignition lock back to the stop at position u. Press the Start/Stop button on the engine or on the engine shutoff device on the equipment. Secure the vehicle/equipment against roll- ing away.
- Page 44 Driving tips After 2000 km (30 operating hours), you can WARNING gradually bring the vehicle up to full road and Do not activate the continuous brake (engine increased engine speeds. brake/retarder) on slippery road surfaces. The wheels may otherwise become locked and the vehicle could skid.
- Page 45 Refuelling ® AdBlue consumption change out of clothing which has come into contact with fuel immediately. ® AdBlue /DEF consumption is between 4 and if fuel is swallowed, a doctor should be con- 8% of the fuel consumption, depending on sulted immediately.
- Page 46 Refuelling Before filling the tank Change clothing that is soiled with ® AdBlue /DEF immediately. Switch off the engine. If allergic reactions occur, consult a doctor Secure the vehicle/equipment against roll- immediately. ing away. ® Keep AdBlue /DEF out of the reach of chil- Switch off the auxiliary heating system.
- Page 47 Winter operation using the integrated hand pump WARNING page 86). Coolant contains glycol and is therefore toxic. Do not swallow the coolant. See a doctor immediately if you swallow coolant. Winter operation Make sure that coolant does not come into Cold-start aids contact with skin, eyes or clothing.
- Page 48 Winter operation Keep children away. Observe this Owner's Man- ual. Always aim to achieve the full charge status. You can do this by means of careful mainte- nance and low electrical consumption. The cold start capacity is reduced when it is very cold.
- Page 49 Service products ......... 48 Cleaning and care ....... 56 Maintenance ........57...
- Page 50 Do not inhale the vapours. When indoors, You can recognise service products approved always ensure there is sufficient ventilation by Mercedes-Benz by the following inscrip- to prevent intoxication. tion on the container: Do not let service products come into con- MB Approval (e.g.
- Page 51 (viscosity) classification for certain tempera- engine oils that comply with Sheet No. 228.5 ture ranges. Change the engine oil to an SAE or Sheet no 228.51 of the Mercedes-Benz class suitable for the time of year and the Specification for Service Products.
- Page 52 You can only achieve the maximum oil change intervals by using engine oils of particularly high quality (e.g. in accordance Coolant with Sheet No. 228.5 of the Mercedes-Benz Specifications for Service Products). Coolant additive with antifreeze prop- erties Environmental note...
- Page 53 Further information about operating and road that is 50 % by volume. safety for your engine/vehicle/equipment is Before topping up, check the quality of the available from any Mercedes-Benz or MTU antifreeze/corrosion inhibitor (Sheet. No.) in Service Centre ( page 11).
- Page 54 Information about current country-specific EN 590 describes a sulphur-free fuel with a fuel sulphur contents can be obtained from maximum sulphur content of 10 ppm. How- any Mercedes-Benz or MTU Service Centre ever, it is also permitted to operate engines page 11). ®...
- Page 55 The cold flow properties of the fuel may dete- available at any qualified specialist work- riorate as a consequence of the flow shop, e.g. a Mercedes-Benz or MTU improver. Service Centre. If summer diesel fuel or winter diesel fuel with...
- Page 56 Allow the engine to run for at least Observe the specifications in accordance one hour before switching off the vehi- with Sheet no. 135.0 of the Mercedes-Benz cle/equipment. Specifications for Service Products for oper- ation with FAME fatty acid methyl ester fuel.
- Page 57 Service products High outside temperatures ® of BlueTec exhaust gas aftertreatment. The ® AdBlue /DEF crystals can be removed with WARNING clean water if necessary. ® If the AdBlue /DEF tank cap is opened at high temperatures, ammonia vapours may escape. Additives, tap water Ammonia vapours have a pungent odour and ®...
- Page 58 Mercedes-Benz recommends that you only use care products that have been approved Make sure that no water enters the air for Mercedes-Benz. You can obtain these intake and ventilation openings. care products from any Mercedes-Benz or Treat the engine with preservative MTU Service Centre ( page 11).
- Page 59 Maintenance All maintenance work and maintenance Maintenance intervals refer to genuine Mercedes-Benz Introduction parts and accessories that have been expressly approved for the engine by WARNING Mercedes Benz. Before carrying out maintenance or repair The scope of maintenance and frequency of...
- Page 61 Work schedule overview ....60 Work schedules ........62...
- Page 62 Adjustment subject to a separate invoice. In the event of fluid loss, find the cause and remedy it. For further information, see the vehicle manufacturer's instructions. Engine AP13.22-G-1351DD Check poly-V-belt for wear and damage. • • Work item number of the Mercedes-Benz workshop information system (WIS).
- Page 63 Work schedule overview Additional maintenance work every second maintenance service (Z2) AP05.30-G-0560DD Check V2 valve clearance, adjust (first maintenance service, • • 3rd, 5th, 7th etc.). • ® AP14.40-G-1481DD Replace AdBlue /DEF filter. Additional work every third maintenance service (Z3) AP47.20-G-0730DD Fuel prefilter: clean the filter element.
- Page 64 Work schedules AP09.00-W-0953A Intake pipe between air filter, charge-air cooler and engine: • • check for leaks and condition. AP20.20-W-T052A All reservoirs, covers, bellows, protective caps. • • AP20.00-W-2050A Heating system: condition check, radiator, lines and hoses. • • Every three years (J3) Engine AP20.00-W-2080A Renew coolant, according to Sheet Number of the antifreeze/ •...
- Page 65 Work schedules Unscrew oil filter cap : using a socket To siphon off engine oil: pull out dip- stick ;. spanner insert (SW 36). Allow the oil to drain from the filter housing. Insert the extractor system into the guide Remove oil filter cap : with oil filter ele- tube, using an O-ring to seal it.
- Page 66 Work schedules Adding engine oil Checking and adjusting valve clearan- Layout of cylinders and valves Example: OM 926 LA Filler neck Dipstick Cylinder number : - B Add the new engine oil at filler neck :. Intake valve Select the SAE viscosity class of engine oil Exhaust valve in accordance with outside temperatures.
- Page 67 Work schedules Removing and fitting the cylinder head Test toler- Inlet +/- 0.05 mm covers ance valves Exhaust +/- 0.10 mm valve The tolerance is only applicable for checking, not as a valve clearance setting. Adjust the valve clearance when the engine is cold (at least 30 minutes after stopping the engine, even if it has only been operated for a brief period).
- Page 68 Work schedules Valve clearance setting OM 906/926 LA Crankshaft Cylinder/valves to be position adjusted Cylinder no. 6, valve overlap Cylinder no. 1, valve overlap I – inlet valve E – exhaust valve Example: flywheel inspection hole Adjust all valve clearances at two crankshaft positions.
- Page 69 Work schedules Measure the valve clearance between the Check the poly-V-belt condition regu- rocker arm and the valve bridge using a larly. feeler gauge (arrow). It should be possible Replace the poly-V-belt concerned to pull the feeler gauge through with only immediately if there are any signs of light resistance.
- Page 70 Work schedules Breaks in the ribs Cord torn out of the side Transverse cracks in several ribs Outer cord frayed Rubber nodules at the base of the belt Transverse cracks on the back of the belt Deposits of dirt and stones Transverse cracks in several ribs Check the poly-V-belt for damage regularly.
- Page 71 Work schedules Leakage fuel from the engine Vehicle with fuel prefilter at tank level: To the fuel pump close shutoff valve ?. From the fuel tank Place a collector under water drain valve Fuel return line to the fuel tank Open water drain valve E and bleed screw Fuel pump =.
- Page 72 Work schedules Start the engine and bleed the fuel system. Clean the outside of the filter housing. Run the engine for approximately 1 minute. Open the fuel filler cap to prevent excess The fuel system is self-bleeding. pressure in the fuel tank. If the engine stalls or does not start, bleed Unscrew fuel filter cap : using a socket the fuel system manually (...
- Page 73 Work schedules ® ! If AdBlue /DEF gets into the coolant cir- Ammonia vapours have a pungent odour and cuit (even minute amounts), thermostats particularly irritate: and temperature sensors will be damaged. skin ® Always keep AdBlue /DEF completely mucous membranes separate from other service products.
- Page 74 Work schedules Insert new filter element ; into filter bowl ?. Use MB silicon grease as a lubri- cant. Screw filter bowl ? into pump module : and tighten. Tightening torque: 32 Nm. ! Only MB silicon grease is permissible as a lubricant.
- Page 75 Work schedules ing hose is disconnected from the valve, a ® Keep AdBlue /DEF out of the reach of chil- pressure loss of 0.2 bar takes place. dren. To reduce the pressure: press but- ton ; several times. Environmental note ®...
- Page 76 Work schedules Engine cooling system Checking and correcting the fluid level and the antifreeze/corrosion inhibitor WARNING When opening the coolant expansion tank, there is a risk of scalding from hot coolant spraying out. The engine cooling system and the coolant expansion tank are pressurised when the engine is at normal operating tem- perature.
- Page 77 Work schedules correct concentration of 50% antifreeze/ Mount pressure tester tool : on the filler corrosion inhibitor by volume in the coolant neck of the coolant expansion tank. provides antifreeze protection down to Connect the compressed-air hose with tyre Ò37 †. If a lower level of antifreeze protec- inflation connection to pressure tester tion is indicated, correct the mixture ratio.
- Page 78 Work schedules Renewing the coolant WARNING When opening the coolant expansion tank, there is a risk of scalding from hot coolant spraying out. The engine cooling system and the coolant expansion tank are pressurised when the engine is at normal operating tem- perature.
- Page 79 If necessary, degrease the cooling system WARNING with a suitable cleaning agent. Information Coolant contains glycol and is therefore toxic. is available from any Mercedes-Benz or Do not swallow the coolant. See a doctor MTU Service Centre ( page 11).
- Page 80 Work schedules Checking for leaks and general condi- WARNING tion – assemblies There is a danger of limbs being caught, pulled in and thereby crushed or severed by rotating Carry out a visual inspection of the engine engine parts. Therefore you should: for signs of leaks.
- Page 81 Decommissioning the engine .... 80 Protecting the engine ......81...
- Page 82 Decommissioning the engine ® Top up the AdBlue /DEF tank until it is full, Decommissioning the engine ® to prevent AdBlue /DEF from crystallising. Particular measures are necessary when the Fuel prefilter with heated water separator: engine/vehicle/equipment is to be decom- drain off the water separator.
- Page 83 Protecting the engine Fuel prefilter with heated water separator: Check that the electrical system, steering drain off the water separator. system and brakes are functioning cor- rectly. Recharge the batteries every three months. Check the battery fluid levels before and Clean the engine/vehicle/equipment thor- after charging.
- Page 84 Protecting the engine Close off all openings on the engine (e.g. Detach the charge-air distributor from the on the charge-air distributor, exhaust etc.) cylinder heads. with an oil-soaked rag. Briefly press the start button on the engine. Drain off the coolant completely for At the same time, pour approximately engines that have been removed.
- Page 85 Protecting the engine The following work is required for engines New engines: add initial operation oil com- that have already been in operation (distance pliant with Sheet No. 225.6. of over 300 km or running time of over 6 For engines that have already been in oper- operating hours): ation (distance over 300 km or running time of over 6 operating hours): before starting...
- Page 87 General notes ........86 Bleeding the fuel system ....86 Activating engine emergency run- ning mode ..........87 Troubleshooting ........89 ® BlueTec exhaust gas aftertreat- ment indicator (on-highway ver- sion) ............. 94 ® BlueTec exhaust gas aftertreat- ment indicator lamp (off-highway version) ..........
- Page 88 Bleeding the fuel system General notes Fuel system with fuel prefilter Fuel prefilter overview WARNING If maintenance and repair work is carried out on the engine incorrectly, this can cause engine failure. Engine failure can lead to an increased risk of accidents. Maintenance and repair work on the engine may only be carried out by personnel who have undergone the appropriate training.
- Page 89 The fault memory and engine data can be read out using this Activating engine emergency running diagnostic equipment. Information is avail- mode able from any Mercedes-Benz or MTU Emergency mode for on-highway Service Centre ( page 11). applications...
- Page 90 Activating engine emergency running mode Emergency mode for off-highway applications Full engine output can be activated with an emergency switch for devices with Euromot 3B or Tier 4i certified engines (off-highway applications). Emergency mode can only be activated for 30 minutes, and only if the vehi- cle has the appropriate equipment.
- Page 91 Troubleshooting Troubleshooting Engine problems WARNING The operating safety of your vehicle could be affected if maintenance work is carried out incor- rectly. You could lose control of the vehicle and cause an accident. The safety systems may also no longer be able to protect you or others as they are designed to do. Always have maintenance work carried out at a qualified specialist workshop.
- Page 92 Troubleshooting Problem Possible causes/consequences and M Solutions The engine oil viscosity is incorrect. Alter the engine oil viscosity to the conditions of use page 49). The engine does not There is a malfunction in the engine control unit. start correctly. Read out the MR (engine control) unit;...
- Page 93 Troubleshooting Problem Possible causes/consequences and M Solutions The coolant temperature is too high. Check the temperature sensor; replace if necessary. Check the fan speed. The thermostat is malfunctioning: consult a qualified specialist workshop. Malfunction in the fuel system (blocked, leaking). Visual inspection for leaks Consult a qualified specialist workshop.
- Page 94 Troubleshooting Problem Possible causes/consequences and M Solutions Fuel consumption is Connection points (unit pump – line and fuel injectors) are leaking. too high. Have a qualified specialist workshop check for leaks. Misfiring: have the engine checked at a qualified specialist workshop.
- Page 95 Troubleshooting Problem Possible causes/consequences and M Solutions The engine emits black The air filter is heavily contaminated. smoke. Replace the air filter element. The engine brake is faulty. Consult a qualified specialist workshop. The exhaust gas turbocharger is faulty. Carry out a visual check. Consult a qualified specialist workshop.
- Page 96 ® BlueTec exhaust gas aftertreatment indicator (on-highway version) ® BlueTec exhaust gas aftertreatment indicator (on-highway version) WARNING The operating safety of your vehicle could be affected if maintenance work is carried out incor- rectly. You could lose control of the vehicle and cause an accident. The safety systems may also no longer be able to protect you or others as they are designed to do.
- Page 97 Replacing the poly-V-belt ® BlueTec exhaust gas aftertreatment indicator lamp (off-highway version) System messages Problem System message ® ® AdBlue /DEF level low The å AdBlue /DEF indicator lamp lights up. ® AdBlue /DEF quality not OK ® ® AdBlue /DEF level too low, no sup- The å...
- Page 98 Replacing the poly-V-belt risk of injury from crushing or entrapment in pretensioned parts. Always carry out work on the tensioning device with extreme care. Make sure that the tool is handled cor- rectly. Belt profiles Poly-V-belt routing (engine without refrigerant compressor) Alternator Tensioning pulley...
- Page 99 Replacing the poly-V-belt and for wear of the tooth profile on the belt pulleys. Replace faulty parts. Route the new poly-V-belt over all belt pul- leys except the tensioning pulley (observe the poly-V-belt routing shown in the illus- tration). Swing the tensioning pulley up using the lever, lay the poly-V-belt over the tension- ing pulley and allow the tensioning pulley to swing back.
- Page 101 Engine data plate ......100 Information on the engine data plate ........... 100 Engine model designation ....100 Engine data card ....... 100 Engine data ........101...
- Page 102 Manufacturer's name The engine data card must be presented or Engine model designation the complete engine number must be speci- Engine number fied for the procurement of genuine Mercedes-Benz parts.
- Page 103 Later changes to the scope of delivery are not recorded on the data card. Conversion parts on the engine which change the scope of the engine delivered by Mercedes-Benz must be recorded on the data card. In order to prevent incorrect ordering of replacement parts, the Mercedes-Benz replacement parts service must also be informed.
- Page 104 Engine data Weights OM 904 LA OM 906 LA OM 924 LA OM 926 LA Dry engine 395 kg 530 kg maximum Wet engine 420 kg 573 kg maximum...
- Page 105 General data All data refers to the standard version of the respective engine type. Data for other versions is available on request. Engine Engine type OM 904 LA OM 906 LA OM 924 LA OM 926 LA Assembly model series 904.9...
- Page 106 Engine data Operating data Engine type OM 904 LA/OM 924 LA OM 906 LA/OM 926 LA Rated engine speed 2200 rpm 2200 rpm Effective engine speed range 2500 rpm 2500 rpm Idling speed Approximately 600 rpm Approximately 600 rpm Engine brake permissible up to...
- Page 107 Engine data Capacity Service product approx- (Sheet No. imately ® MB silicon grease AdBlue /DEF filter sealing rings Cooling sys- Total capacity OM 904/924 LA 8.5 l Coolant (310.1, 325.0/2, 326.0/2, OM 906/926 LA 12.5 l 325.3, 326.3) Corrosion inhib- OM 904/924 LA 4.25 l itor/antifreeze...
- Page 108 Engine data Oil circuit Drain plug on the oil pan M 20 x 1.5 70 Nm M 26 x 1.5 90 Nm Oil filter cap on the oil filter housing 40 Nm Cooling system Coolant drain screw On the crankcase 60 Nm On the radiator 2 Nm...
- Page 111 Imprint Internet Further information about Mercedes-Benz engines, Daimler AG and Tognum AG can be found on the Internet at: www.mercedes-benz.com www.daimler.com www.mtu-online.com Documentation team Should you have any questions or sugges- tions regarding this manual, you can reach the technical documentation team at the fol-...
- Page 112 É9265842181fËÍ 9265842181 Order no. 6462 9827 02 Part no. 926 584 21 81 Edition B 06-12...