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Westerbeke L25 Operator's Manual
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Westerbeke L25 Operator's Manual

Westerbeke L25 Operator's Manual

Marine diesel
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TECHNICAL MA.NUAL
.
.
WESTERBEKE L25
Mar·lna Diesel Engine
Publication 19419
Edition 4
July 2010
WESTERBEKE .
WESTEFisEi<ECORPORATION
MYLES STANDISH INDUSTRIAL PARK
160 JOHN HANCOCK ROAD, TAUNTON, MA 02780-7319

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Summary of Contents for Westerbeke L25

  • Page 1 TECHNICAL MA.NUAL WESTERBEKE L25 Mar·lna Diesel Engine Publication 19419 Edition 4 July 2010 WESTERBEKE . WESTEFisEi<ECORPORATION MYLES STANDISH INDUSTRIAL PARK 160 JOHN HANCOCK ROAD, TAUNTON, MA 02780-7319...
  • Page 3 SECTION INDEX GENERAL Introduction Operation Insta,lIation Maintenance ENGINE OVERHAUL 'OTHER OVERHAUL Marine Engine Electrical System Cooli!1g System (External) Transmissions GENERATOR SETS HYDRAULIC CRANKING SYSTEM SERVICE BULLETINS...
  • Page 4 . YOUR NOTES...
  • Page 5 INTRODUCTION IMPORTANT THIS MANUAL IS A DETAILED GUIDE TO THE INSTALLATION, START-UP, OPERATION AND MAINTENANCE OF YOUR WESTERBEKE MARINE DIESEL ENGINE. THE INFORMA- TION IT CONTAINS IS VITAL TO THE ENGINE'S DEPENDABLE, LONG TERM OPERA- TION. READ KEEP IT IN A SAFE PLACE...
  • Page 7 J. H. to position as soon as the restriction has Westerbeke Corporation. been passed. In case it is necessary to hoist the RIGGING AND LIFTING engine either front end upwards or reverse The engine is fitted with lifting rings.
  • Page 8 PROPELLER COUPLING FOUNDATION FOR ENGINE A good engine bed contributes much Each Westerbeke Diesel engine is regu- toward the satisfactory operation of the larly fitted with a suitable coupling for engine. The engine bed must be of rigid connecting the propeller shaft to the construction and neither deflect nor twist engine._...
  • Page 9 In making the final check for alignment, ment at frequent intervals and to correct the engine half coupling should be held in any errors when they may appear. Misalignment between the engine and the one position and the alignment with propeller coupling tested with the propeller propeller shaft is the cause of troubles coupling in each of four positions, rotated...
  • Page 10 . support for the rubber hose to prevent cause rapid deterioration. Galvanized iron fittings and galvanized iron pipe is sagging, bending, and fo~ation of water pocket·s. recommended for the exhaust line. The ex- haust line must be at least as l~rge Always arrange that water discharge the engine exhaust manifold flange and be...
  • Page 11 ELECTRIC PANEL interior is gel coated to prevent fibers The Westerbeke all-electric panel util- from contaminating the fuel system. izes ari electronic tachometer with a Copper or galvanized fuel tanks should not built-in hour meter.
  • Page 12 ~elating plied, especially those to fuse/ cicuit breaker requirements. Starter batteries should be located as close to the engine as possible to avoid voltage drop through long leads. It is bad practice to use the starter batteries for other services unless they' require low int~rmitt amperage or are ent '.
  • Page 13 OPERATION BLEEDING THE SYSTEM PREPARATION FOR FIRST START The engine is shipped "dry" ••• with lub- The fuel injection system of a compres- 'ricating oil drained from the crankcase sion ignition engine depends upon very and transmission. Therefore, be sure to high fuel pressure during the injection follow the~e...
  • Page 14 bleeding proceeds as follows. Fig. I for mechanically governed and Fig. "D" Leave the governor bleed screw for hydraulically governed pumps. slackened. Next slacken any two injector pipe line connections at the injector end. , Set the throttle to the fully open pos- ition and turn the engine until fuel free from air flows from the unions.
  • Page 15 cap when refueling - see that it doesn't Do be careful to ,check with the engine pick up dirt or grit - this is how quite parts list regarding whether the engine a lot of dirt gets into the tank. requires injector seating washers or not.
  • Page 16 gine can be warmed up with the clutch reading after a stop does not neces- in neutral at 1000 rpm. Warming up sarily signal against restarting. ala~ with clutch in neutral takes longer and If there is no functional difficulty, tends to overheat the transmission, if temp~ratures will quickly return to...
  • Page 17 TEN MUST RULES IMPORTANT . IMPORTANT IMPORTANT ••• for your safety and your engine's dependability. ALWAYS - 1. Keep this Manual handy and read it whenever in doubt. 2. Use only filtered fuel oil and check lube oil level daily • .
  • Page 18 YOUR NOTES...
  • Page 19 MAINTENANCE PERIODIC ATTENTION: After you have taken delivery of your engine, it is important that you make the following checks right after the first fifty hours of its operation: FIFTY HOUR CHECKOUT (INITIAL) Do the following: 1. Retorque the cylinder head bolts. 2.
  • Page 20 CAUTION: The use of different brands of 3. Fill fresh water cooling system with lubricating oils during oil changes has antifreeze of a reputable make. (Refer been known to cause extensive oil sludg- to Cold Weather Precautions.) 4. Start engine. When temperature gauge ing and may in many instances cause com- plete oil starvation.
  • Page 21 LUBRICATING OILS Lubricating oils are available for Westerbeke Diesel engines which offer an improved standard of performanc'e to meet the requirements of modern operating conditions such as sustained high speeds and temperatures •. These oils meet the requirements of the U. S. Ordnance Specification MIL-L-2l04B (API Service CC).
  • Page 22 YOUR NOTES...
  • Page 23 ENGINE OVERHAUL Two series of engines have be~n used referred to in the text as MK 3 and MK 4. They can be identified by the 2 letter prefix in the serial number. The MK 3 prefix is SP and the MK 4 is FK. TECHNICAL DATA Firing order •...
  • Page 24 Camshaft timi~g 51° -17 Valve Steel backed white metal bush Bearings Oversize bearings available 0·020 in, (0'513 mm.) o/s on 00 std,ID 1 '5597 to 1'.5605 in. (39,617 to 39'637 mm.) Journal diameter _ 0'0025 to 0'0075 in. (0·064 to 0·191 mm.) l;nd-float Connecting Rods and Big End Bearings 4·927 to 4·929 in.
  • Page 25 Cylinder Head Valve guide protrusion above· spring seats 0·260. (inlet and exhaust) Inlet valve depth below head face Mk 3: 0.·0.50 in. Mk 4: 0·050 in. Exhaust valve depth below head face. Mk 3: 0·0.25 in. above Mk4: 0·050 in. Valve spring free length .
  • Page 26 GENERAL DESCRIPTION The engine is a four cylinder, 'in line', overhead valve unit operating on the four stroke cycle w.ith direct flow cylinder head and bowl-in-piston combustion chambers. The cylinder bores are machined directly in. the cast iron cylinder block which is cast integral with the upper half of the crankcase and are provided with full length water jacketing.
  • Page 27 are marked. this is normally done, in production. by a number stamped on the front inter- mediate 'cap . and 4 on the rear intermediate cap. The rear cap is not marked. All caps must be fitted with the cast arrows pointing forwards. The crankshaft bearing.
  • Page 28 The valve seats may be re-faced 'witl.1 a cutter tool with an included angle of 90° 'and the pilot 0·310 (7·S7 diameter of the cutter should be mm.); ,INLET MANIFOLD The inlet manifold is of cast aluminium, and has separate ports for each cylinder. A tap- ped hole is incorporated in the air cleaner mounting flange for the engine ventilation system vacuum connection.
  • Page 29 REAR OIL SEAL CARRIER The crankshaft rear oil seal is pressed into an aluminium carrier which is bolted to the cylinder block rear face, and fitted with a composition type gasket. The oil seal runs on the periphery of the flywheel mounting figure. After removing the carrier, the oil seal can be easily re- placed.
  • Page 30 The camshaft front and rear bushes are both approximately in. (19·1 mm.) wide, the front one having an additional oil hole for the rocker shaft oil feed, and the centre bush approxi- , mately in. (15·9 mm.) wide. Fit the bushes using a replacer detail '-3b' in addition to the adaptors previously used.
  • Page 31 ·The centre main bearing journal has a double radius of 0,070 in. (1'78 mm.) and 0·080 in. (2 ·03 mm.) and the rear main bearing has a double fillet radius, the inner radius of which must .be maintained at 0·100 to 0·110 in. (2' 54 to 2·79 mm.) when regrinding. The remain- ing main journal fillet radii are 0'080to 0·094 in.
  • Page 32 The connecting rod small end bearing is a steel-backed bronze bush, which is not available in service, the connecting rod being serviced with the bush already fitted. ch~ck When dismantling an engine examine the piston markings to the connecting rods for straightness.
  • Page 33 Oversize pistons and rings are not available and replacement cylinder liners should be fitted. Pistons graded to cylinder bore size are fitted to new engines. One grade only is supplied for spares. FLYWHEEL AND RING GEAR The cast iron flywheel is located concentrically on the crankshaft flange and retained by six bolts fitted with washers and Loctite.
  • Page 34 THE OIL FILTER The full flow type oil filter is screwed to a mounting flange integral with the oil pump body and is of the disposable cartridge type. VENTILATION SYSTEM A semi-closed positive ventilation system is fitted as standard and consists of a breather and oil separator and a connecting tube to the inlet manifold.
  • Page 35 MAINTENANCE AND REPAIR Section A TOP ENGINE OVERHAUL - DECARBONISE CYLINDER HEAD AND REGRIND VALVES Ope No. Disconnect battery. Shut off fuel supply. Turn off seacock. Drain cooling system. Drain taps are located on port side of cylinder block and underside of heat exchanger. Disconnect sea water outlet hose on top of sea water pump.
  • Page 36 Check valve rocker oil feed hole is clear of obstruction, hole is located at No. 1 rocker pillar base. Clean tops of pistons of carbon and remove all traces of old cylinder head gasket from top of cylinder block. Thoroughly clean out exhaust manifold. Check injector sprays and pressure setting.
  • Page 37 A15 . THROTT LELEVER VENT SCREW FUEL INJECT.ION PUMP VENTING AND TIMING DETAIL Tighten the bolts as shown in Fig. 1. This should preferably be done with the engine hot, using a Torque wrench and repeating the sequence in . stages until the correct torque figure of 65/70'...
  • Page 38 To replace ball race on driven sprocket, drive off old race with a drift and press on re- placement ensuring that ball race is properly seated against shouider. To replace needle roller inner race use tool No. 52350 and draw off race and press on replacement flush with end of sprocket hub.
  • Page 39 CHAINCASE COVER NEEDLE ROLLER OUTER RACE FLUSH WITH BOSS FACE SECTION OF CHAINCASE COVER FITTING JOINING LINK TO FUEL PUMP DRIVE CHAIN JOINING LINK...
  • Page 40 TO SERVICE FUEL INJECTOR PUMP DRIVE CHAIN ONL V Ope Nos C1-C6 and C16-C17. Replace chain if wear greater than ,002 in. per link. TO SERVICE FRESH WATER PUMP Ope No. Carry out operations C2-CS. Withdraw fresh water pump pulley flange from pump shaft, after removing drive pin when fitted.
  • Page 41 Carefully align the pivot pin hole of yoke with pivot pin hole in end bracket by mov- ing solenoid assembly and fit pin (with head uppermost when installed on engine). Note: A new pin MUST be used after dismantling a starter. Fit the two bolts retaining the solenoid ensuring that the rubber sealing diaphragm is properly seated in the recess and fully tighten bolts.
  • Page 42 DIESEL .ENGINE . FAULT FINDING CHART MECHANICAL FUEL ENGINE OVERHEATS ________________ - r ______ ~----------------~ Faultv injector(s) Insufficient water: Insufficient lubricating oil: Fan belt slack or broken: Thermostat sticking: Injection timing incorrect: Water pump needs attention: Engine needs top overhaul. ENGINE __________________ KNOCK~...
  • Page 43 A19 . TO SERVICE SEA WATER PUMP Ope No. Shut off seacock. Remove hoses. from pump. Remove two tin. bolts and withdraw pump and drive coupling. Remove pump cover plate. Pull out shaft with impellor and remove cam if worn. Replace seals and refit shaft and replacement impellor and cam.
  • Page 44 Remove gearbox if fitted and flywheel housing (6Xr, in. AF bolts). Remove flywheel and stubshaft (r6 in. AF nuts) or flywheel inertia weight (6Xt in. ge~rbox AF bolts) and drive plate if hydrauli.c is fitted. Invert engine and remove sixteen in.
  • Page 45 <l.l OTHER OVERHAUL SECTION PAGE CONTENTS MARINE ENGINE ELECTRICAL SYSTEM •••••••••••••••••• Activation by Fuel Pressure •••••••••••••••••••••••••• Q.2 Activation by Lube Oil Pressure •••••••••••••••••••••• Q.4 COOLING SYSTEM (EXTEBNAL) •••••••••••••••••••••••• R TRA,NSMISSIONS •••••• • ,_ •••••••••••••••••• -•••••••••• S Type SAl Manual •••••••••••••••••••••••••••••••••••••• S.2 'Type SAO Manual ••••••••••••••••••••••••••••••••••••••...
  • Page 46 SECTION MARINE ENGINE ELECTRICAL SYSTEM ACTIVATION BY FUEL·PRESSURE (Push Button Start) This system is supplied on all four and six cylinder Westerbeke engines beginning January 1975. the ·system is Basically~ very simple and eliminates the need for a separate switch position to activate the engine alarm system, when supplied.
  • Page 47 SECTION AcnYATION FUEL PRESSURE (PUSH BurrON START) IN~!RT WIlliNG FOil ..-------1 L-ZS ,sTARTER UOTOlt, · INSTRUMENT PANEL A5SEM8LY 'IltA. YIIE-' _ _ _ INOT uKO r------------~--·- SEE IIOTI ..~W,T,G, 1iI ..=:.I.-..~ • • all , l~.:- _ __ __ _ ALT!RN~!O~R' WIRING F'01!_L-2!1...
  • Page 48 Marine Engine Electrical System ACTIVATION BY LUBE OIL PRESSURE (Keyswitch Start) This system is supplied on all 4 and 6 cylinder Westerbeke diesels produced prior to January 1975. Operation is very simple. Putting the start switch in the Run posi- tion energizes an alarm system (when sup- plied).
  • Page 49 SECTION R COOLING SYSTEM (EXTERNAL) 1. DESCRIPTION the fresh water. The freshwater flows The Four Marine Diesel Engines are from the exp~nsion tank to the heat ex- changer; here it is cooled and discharged equipped with a fresh water cooling system. into the lower part of the cylinder block, Transfer of heat from the fresh water (closed system) circuit to the sea (raw) .
  • Page 50 water via the heat exchanger. This raw 7. IMPELLER REPLACEMENT water is picked up from the sea by a power- a. Remove front end cover and gasket. ful neoprene impeller sea water pump, and b. Remove impeller. passes through the oil cooler to the heat c.
  • Page 51 SECTION S L25 TRANSMISSION ADJUSTMENT OF GEAR MANUAL MARINE REVERSE GEAR First remove Inspection Cover of Gear Box. AHEAD CLUTCH (Ref: Plate "M") Rotate the drum M4 until the locking tab M20 is observed. This tab locks the aft part of drum to the forward part and engages in castellations cut in the forward portion.
  • Page 52 AH~AD Check the adjustments of both and REVERSE to see that these are correct. Check for worn or unevenly adjusted Toggles and Toggle Links. These may have been replaced at sorne time and were not correctly adjusted to produce even pressure on the clutch plates through the plungers.
  • Page 53 GEARBOX AND REDUCTION GEAR Plate Description Ory. Plate Description Oty. clam~ Gearbox nut for bolt S.L. Joint, s~.,ort flange to gearbox Transax pin secur ng lever CroBs ahaft seal Reduction gear housing Dip-stick, gearbox 011· lev.1 Cover, reduction gear ouslng. .
  • Page 54 PLATE -M- CLUTCH Plate Description Oty. Plunger only Gear, forward stub shaft Pilot bush for gear Cone key for gear Split pin M4" Drum Operating collar assembly Drum bush Control shoe Split cone Fork lever Transax pin. pair Forward push plate Cross shaft Stud.
  • Page 55 M52 into the splined plates, finally screwing home the Drum completely dismantle the reverse gear. it is better to slack off ,Arm PiateM19When replacing the coupling L25 before fitting . the nut L27 which secures the coupling BEFORE commenc- the key to the shaft slide the '0' ring upto the bearing, having ing to remove the gearbox as it is then so much easier to first checked there are no cuts in the ring.
  • Page 56 It is sometimes necessary to fit an extra joint between the faces of the housing and the cover to give perfect freeness. When replacing the coupling L25 before fitting 'the key to the shaft slide '0' up to the bearing having first checked there are no.
  • Page 57 SECTION V SERVICE -BULLETINS The following Bulletins contain supplementa~y and up- dated information about various components service pro- cedures which are important to the proper functioning of your engine and its support systems. You should familiarize yourself with the subjects and make su~e that you consult the appropriate Bulletin(s)
  • Page 58 The goal is to prevent excessive exhaust temperatures with the least amount of sea water. PN 19149 May 6, 1974 J H. WESTERBEKE CORP.' AVON INDUSTRIAL PARK· AVON, MASS. 02322 U.S.A.' TELEPHONE: 6i7 588·7700· TELEX: 92·4444· CABLE: WESTCORP.
  • Page 59 WESTERBEKE SERVICE BULLETIN #81 REISSUED: October 3, 1975 SUBJECT: Hydro-Hush Muffler Installation MODEL: DISTR: The diagram on the reverse side shows a proper installation of the Hydro- Hush stainless steel muffler. Make sure installation is such that water cannot enter engine at any an~le of heel or pitch.
  • Page 60 HYDRO-HUSH BELOW ENGI NE . AIR VENT • • PH.llI7" H'tDRO- HU$H 3J"MA.\. SEE WATER PUMP EXHAUST OUTLET. r -. _ - - " .. :r"' : ' : :. II II I..• 11:1 ~INSULATION. It::]. I/~Jr--:.~ '~..?U\ivNT' L.U.L <e:.-"\ \.- ---'if' PN.13171...
  • Page 61 -170-200 V.D.C. Performer-Six, 115 Horsepower, diesel 200 minimum hour range maximum. The ampere shown minimum. There no real TELEP~ONE: 617 588·7700· TELEX 92-4444· CABLE WESTCORP J H WESTERBEKE CORP· AVON INDUSTRIAL PARK· AVON. MASS 02322 USA . 20442 Page 1/1...
  • Page 62 .oil of the same type normally used. Don't forget to drain to normal level before next start. H. WESTERBEKE CORP.' AVON INDUSTRIAl. PARK· AVON, MASS 02322 U S.A ,TELEPHONE, 617 588·7700· TELEX 92·4444· CABLE' WESTCORP PN 20629 7/16/75 . . '...
  • Page 63 BULLETIN #83 can't S~RVICE INSTALLATION ANGLE The installation angle must not exceed to the horizontal. ROTATION This transmission turns a RIGHT HAND propeller on the above engine models. OPERATING TEMPERATURE This transmission is air cooled and proper ventilation of the engine compartment is required.
  • Page 64 This unit is sealed for maximum life and is repairable. Conti nued-Reverse Si de J H WESTERBEKE CORP, AVON INDUSTRIAL PARK, AVON, MASS. 02322 U.S.A.' TELEPHONE: 617 588-7700' TELEX 92-4444· CABLE: WESTCORP, 20701 9/75 Paae 1/1...
  • Page 65 BY-PASSING SPLITTER: In the event of failure, batteries may be charged directly from alternator. by· connecting either splitter terminal 'lor #2 to terminal bYDassing the splitter .i·tself. This should not be done simultaneously for both batteries unless they are, and will remain at, the same voltage (state of charge) •...
  • Page 66 Overleaf is a parts list and an illustration showing the proper installation of the fuel pressure switch used 'on most of our 'engine products. PIN 21564 , 9/9/76 J H. WESTERBEKE CORP.' AVON INDUSTRIAL PARK· AVON. MASS. 02322 U.S.A.' TELEPHONE: 617 588-7700' TELEX: 92-4444' CABLE: WESTCORP.
  • Page 67 //0___., ..------., -1-1 •• rUY"I-1 V ••• OM •• CO.O FUEL INJECTION PUMP. (ON ENGINE) 19187 licK NO. SCREW /9442 1="/.,#/7 WASHER "0" OeD. RINt:; }(" if!) SWlr~H 11.383 FUEl. PRESSURE 1"1 fDI5 PLUt; -Ii, /9321 ·0· RINd: ADAprE~ ·/918S COPP£~ 192GI iAlllSHee...
  • Page 69 PARTSLIST CONTENTS WESTERBEKE L25: BLflCK WESTERBEKE L25: HEAD - MANIFOLDS WESTERBEKE L25: PUMPS - COVERS - ALTERNATOR WESTERBEKE L25: FUEL SYSTEM WESTERBEKE L25: BACK END - STARTER WESTERBEKE L25: ELECTRICAL SYSTEM TYPE MANUAL TRANSMISSION: EXTERNAL - REDUCTION TYPE MANUAL TRANSMISSION: INTERNAL - CLUTCH SUPERCEnF.D...
  • Page 71 BLOCK WESTERBEKE L251 Q' \ JAN NAME REMARKS 8LOCl< CYLINDER-BARE 21224 Pl.UG CORE 21225 DIPSTICK BORE PLUG 21226 PLUG CORE 21227 PIPE OIL PICK-UP 21228 SUPPORT OIL SEAL 21229 OIL SEAL SUPPORT BOLT 212321 OIL SEAL. SUPPORT GASKET 21231 a I"L SEAL.
  • Page 72 L251 BLOCK ~ESTER8EKE...
  • Page 73 WESTERBEKE Bl.OCK L251 ·NAME REMARKS ~F"F' QUAN ;q.4 21287 SUMP REAR SEAL 21288 SCREW SUMP 21289 GASKET SUMP-ONE PAIR 21290 SUMP Pl.UG ADAPTER 21291 ELBOW SUMP PLUG 21292 OIPSTICK 21293 TUBE DIPSTICK 21294 BRACKET DIPSTICK TUBE 21295 TUBE· DIPSTICK EXTENSION...
  • Page 74 HANI~OlDS WESTERBEKE L25. HEAD -...
  • Page 75 WESTERBEKE HEAD - MANIFOLDS L251 REMARKS QUAN NAME ~rF" CYLINDER HEAD 21088 CYLINDER HEAD ROLT 21089 CYLINDER HEAD GASKET 21090 EXHAUST 21396 F"LANGE INLET VALVE 212191 VALVE: EXHAUST 21~92 SPRING VALVE 21093 VALVE SPRING RETAINER 21094 SPLITCONE VALVE SPRING 21a95...
  • Page 76 WESTERBEKE L251 HEAD - MANIFOLDS...
  • Page 77 WESTERBEKE L251 HEAD • HANlrOLDS NAME QUAN ~rF" REMARKS GASKET EXHAUST MANlrOLO-rRONT AND REAR PORTS 21139 ElPOW 19438 EXHAUST-WATER INJECTED 5~-1 INLET 52.2 EXHAUST ELBOW 21141 GASKET EXHAUST F'L.NGE 21142 SCREW EXHAUST F'LANGE 21143 21144 llF'TING GUIDE VALVE 21145 LOCKWASHER...
  • Page 78 WESTERBEKf L25, PUMPS - COVERS. ALTERNATOR...
  • Page 79 WESTERBEKE L2S: PUMPS - COVERS • ALTERNATOR QUAN NAME REMARKS CASE CHAIN 21158 BRACKET TO CHAIN CASE 21160 BOLT SCREW 21161 PUMP DR'I VE SPROCKET 21162 RACE RALL 21163 BALL' RACE RETAINER 21164 NEEDLE ROLLER 21.165 BEARING Al.TERNATOR 21386 INNER...
  • Page 80 W£STERBEKE L25; PUMPS COVERS. ALTERNATOR .,10...
  • Page 81 WESTERBEKE L25: PUMPS - COVERS - ALTERNATOR NAME REMARKS QUAN HOSE SEA WATER PUMP OUTLET 212~6 CL.A.MP HOSE-SEA WATER LINE 212C!J7 HOSE-SEA WATER rROH PU"'1P 21208 CL.AMP BELT 21.209 BUSHING HOSE RtlNFORCING 21210 LOCKWASHER 21211 LOCKWASHER 21212 SEARING ASSEMBLY.FRESH WATER...
  • Page 82 WESTERBEKE L25: FUEL SYSTEM...
  • Page 83 WESTfRBEKE L251 FUEL SYSTEM NAME REMARKS ~F'r QUAN FUEL LI,T PUMP 21.313 PUMP PRIMER F'UEL LIFT 21314 1.-2 FUEL LIFT PUMP GASKET 21315 FUEL LIFT PUMP MOUNTING SCREW 21316 LIFT PUMP TO FILTER LINE 21317 F'ILTER r:UEl 21318 BRACKET LIFT PUMP 21319 ELEMENT FUEL F'ILTER...
  • Page 84 WESTERBEKE L251 FUEL SYSTEM...
  • Page 85 WESTERBEKE L25a FUEL SYSTEM NAME REMARKS. QUAN WASHER 21366 BOLT 21367 LOCKWASHER 21368 WASHER SHAKEP'ROOF' 21369 SCREW 2137ra LOCKWASHER 21371 SPLIT 21372 ANCHOR 21373 SCREW CLIP 21314 BOLT EXTENSION 21375 EXTENSION BOLT 21376 LOCKWASHER 2t377 NOl~LE INJECTOR 21378 COVER INJECTION PUMP...
  • Page 86 WESTERBEKE L25. BACK [NO • STARTER "-.
  • Page 87 WESTERBEKE L251 BACK END - STARTER QUAN NA~E ~'F" REMARKS MOTOR STARTER 2138Z BOLT STARTER HOUNTING 21382 STARTER MOUNTING BOLT 21383 LOCKWASHER 21384 ASSEMBLY 21385 STUD STUB SHAFT 21238 STUD STUB SHAFT 21239 SHAFT STUB 21240 BOLT STARTER MOUNTING 21395...
  • Page 88 WESTERBEKE L25. ELECTRICAL SYSTEM WIRING IN¥!!! VOl! L-l! STARTEA MOTOR. r------------a.;:--·---l J------~ IN~TRUMtNT PANEL AS!'oEMeLY fllUII Yllt-' ..,.. yn lICIT UUO NOTI"", ,~W.T.G. ~WI-I D~~~I METER IT __ __ _ rAINS O"OIl . L ..t.r"N!>!~ • ti , ORWG 19201 •...
  • Page 89 WESTERBEKE L251 ELECTRICAL SYSTEM REMARKS QUAN NAME ~F'F" AMMETER 19165 HOUR METER TACHOMETER 11917 OIL PRESSURE GAUGE 19166 WATER TEMPERATURE GAUGE 19168 PUSHBUTTON SWITCH 1j.957 Al.TERNATOR 21386 SWITCH rUEL N.O. 11383 SENDER OIL PRESSURE 19167 WATER TEMPERATURE SENDE:R 19169 MOTOR...
  • Page 90 EXTERNAL. REDUCTION TYPE MANUAL TRANSMISSIONI...
  • Page 91 EXTERNAL. REDUCTION TYPE MANUAL TRANSMISSIONI QUAN NAME REMARKS ~F'F' rOR TRANSMISSION HOUSING 21~2~ SUPPORT FLANGE TO TRANSH HSING GASKET 21319 CROSS SHAFT SEAL 21421 TRANSM HSING OIL LEVEL DIPSTICK 21~18 DRAIN-TRANSM HSING PLUG 2~991 SET-SAND ANTI-RATTLE SCREW 21ZOJ7 LOCK 20985 INSPECTION COVER 21311...
  • Page 92 TYPE MANUAL TRANSMISSIONI EXTERNAl REDUCTION...
  • Page 93 TYPE MANUAL TRANSMISSIONI EXTERNAL. REDUCTION NAME REMARKS QUAN FOR DRIVE SPROCKET 21028 SPACER BEARING BALL .. AF"T 21~27 PLE-.512J LINKS 21~05 CHAIN TR I 54-1 TRIPLE-46 LINKS ;4 .. 2 21006 CHAIN 21Z30 SPROCKET DRIVEN-J8T 55-1 . OR I VEN-3'1 T 212131 SPROCKET 55-2...
  • Page 95 INTERNAL. CLUTCH TYPE MANUAL TRANSMISSION' ·PN QUAN NAME REMARKS rORwARD STUB SHAFT GEAR 21061 PILOTING.FOR GEAR BUSHING 212162 CONE-FOR TRANSMISSION 21063 DRUM 212143 BUSHING DRUM 21044 SPLIT CONE 21Z54 PUSH PLATE F'ORW~RD 212149 LONG PINION 21048 STUD SHORT PINION STUD· 21047 LONG-WITH BUSHING PINION...
  • Page 97 TYPE MANUAL TRANSMISSION' .. CLUTCH INTERNA~ NAME REMARKS QUAN ~F"r TRANSAX .. F'OR LINK PINS (PAIR.) 21444 PLATE LINK 21QJ81 CROSS/LINK SPACER SHAf'T 21082 MAIN-DO . SHArf 50)-1 21216 SHAFT ·MA 1 ON IN-REDUCT 21017 5t'J·2 & MAIN SHAFT TO TRANSH COUPI.ING 21a60 GEAR...
  • Page 98 PRIOR SUPERCEDED PARTS USED TO SN ~375 NAME REMARKS QUAN ~E'F" r:ORWARO (SN 172 .. 3372) EXCHANGER 21441 F"ORWARO HEAT EXCHANGER (SN 172 .. 3372) BRACKET 21432 OUTLf.T rORWARO HEAT EXCHANGER (SN 172-·3372) 21.427 EXHAUST (SN 172 .. 3372) MANIPOLD 2140.19 EXHAUST ~ANI'OLO...