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BENDIX SNA-01 Service Data

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®
BENDIX
SNA-01
®
The Bendix
SNA-01
®
™
single cylinder compressor developed exclusively
for the following engines; Volvo
and the Mack
MP7 and MP8 engines manufactured
®
from 2006 through 2010.
NOTE: A retrofit kit is included with the compressor
and is intended to support the retrofit of this
compressor only on the engines and time frame
specified above.
DESCRIPTION
The function of the air compressor is to provide and
maintain air under pressure to operate devices in air
brake systems. The Bendix
a single-cylinder reciprocating compressor with a rated
displacement of 15.8 cubic feet per minute at 1250 RPM.
The compressor consists of a water-cooled cylinder head
assembly and an integral air-cooled crankcase assembly.
The cylinder head assembly is made up of the cylinder
head, discharge jumper, cooling plate, and valve plate
assembly. It uses two sealing gaskets and two o-rings.
The cylinder head, discharge jumper and cooling plate
are made from aluminum. The cylinder head contains air
and water ports as well as an unloader assembly. The
discharge jumper is connected to the cylinder head and re-
routes the discharge air to the discharge port of the cylinder
head assembly. It assists in cooling the compressor. A
cooling plate is located between the cylinder head and
valve plate assemblies and also assists in cooling.
The valve plate assembly consists of brazed steel plates
which have valve openings and passages for air and
engine coolant to flow into and out of the cylinder head. The
compressor's discharge valves are part of the valve plate
assembly. The inlet reed valve/gasket is installed between
the valve plate assembly and the top of the crankcase.
The cast iron crankcase houses the piston assembly,
connecting rod, crankshaft, and related bearings.
COMPRESSOR
™
compressor is a service new
D11, D13 and D16;
®
SNA-01
Compressor is
®
™
Inlet Fitting
Coolant Fitting
Cylinder
Head
Cooling
Plate
Valve Plate
Assembly
Crankshaft
FIGURE 1 - BENDIX
SNA-01
®
All SNA-01 compressors are equipped with a safety
valve to protect the compressor head in the event of, for
example, a discharge line blockage downstream of the
compressor. Excessive air pressure will cause the safety
valve to unseat, release air pressure, and give an audible
alert to the operator. The safety valve is installed in the
safety valve port of the discharge jumper. The discharge
jumper's function is to relocate the discharge port such
that easy installation to the existing vehicle discharge line
is permitted. It also enhances discharge air cooling.
Discharge Jumper
Safety
Valve
Rear End
Cover
Crankcase
COMPRESSOR
™
1

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Summary of Contents for BENDIX SNA-01

  • Page 1 ® ™ assembly. It uses two sealing gaskets and two o-rings. All SNA-01 compressors are equipped with a safety The cylinder head, discharge jumper and cooling plate valve to protect the compressor head in the event of, for are made from aluminum. The cylinder head contains air example, a discharge line blockage downstream of the and water ports as well as an unloader assembly.

  • Page 2: General Safety Guidelines

    Bendix ® ® ® ™ any vehicle maintenance where one or more dryer reservoir module, or a Bendix AD-9si ® ® wheels on a drive axle are lifted off the ground dryer, be sure to drain the purge reservoir.
  • Page 3 ™ A nameplate; attached to the outboard side of the crankcase; is stamped with information identifying the Customer Model, Bendix piece number and serial number of the compressor. Customer Piece Number, Bendix Piece Number See Figure 3. and Serial Number PRODUCT OF BENDIX MFD.

  • Page 4: Operation

    Discharge Discharge Air Inlet Valve Valve Air Inlet Open Unloader Port Closed Port Port Discharge Discharge Unloader Port Port Port Cooling Cooling Plate Plate Valve Unloader Valve Plate Piston Plate Unloader Down & Piston Seated Down & Inlet Seated Valve Closed Inlet Valve...

  • Page 5: Air Induction

    When the unloader piston is unseated, an air Bendix SNA-01 air compressors are only permitted to be passageway is opened between the cylinder bore and a naturally aspirated — use of engine turbocharger as an air secondary compartment —...

  • Page 6: Compressor Cooling

    Since If compressor oil passing is suspected, refer to the the air supply for SNA-01 compressor and engine is the TROUBLESHOOTING section (starting on page A-1) for engine air cleaner, periodic maintenance of the engine air the symptoms and corrective action to be taken.

  • Page 7: Important Note

    COMPRESSOR DRIVE IN SERVICE OPERATING TESTS Check for noisy compressor operation; which could indicate Compressor Performance: Build-up Test excessive drive component wear. Adjust and/or replace This test is performed with the vehicle parked and the as necessary. Check all compressor mounting bolts and engine operating at maximum recommended governed retighten evenly if necessary.
  • Page 8 Crankcase Alignment Pins Sleeve Bearing Crankcase Plug Rear End Crankshaft Cover Rear Cover Plate Plug Bottom Cover Gasket O-Ring Crankcase Cover Cap Screw Cap Screws Cap Screw Rear Cover Plate Gasket Lockwasher FIGURE 10 - BENDIX SNA-01 COMPRESSOR EXPLODED VIEW. ® ™...
  • Page 9 Volvo P/N 977650 Plug Oil Supply Line (see notes 1 & 2) Plug 1. Available from Volvo distributor or dealer only. ® 2. Required to retrofit the Bendix SNA-01 compressor on a Mack ® ™ ® MP7 or MP8 engine.

  • Page 10: Leakage Tests

    Unloader leakage is generally exhibited by excessive Bendix “Test and Checklist” published in the Air Brake compressor cycling between the loaded and unloaded System Handbook (BW5057) and on the back of the Dual condition.

  • Page 11: Preparation For Disassembly

    2. The inlet fitting (35) and top coolant fitting (36) were to aid in reassembly. pre-installed on the compressor by Bendix to ensure 6. Remove the front flange mounting bolts/nuts and proper positioning when the coolant and air induction remove the compressor from the vehicle.

  • Page 12: Crankcase Cover

    CRANKCASE COVER 2. Carefully inspect both sides of the head gasket surfaces on the cooling plate (15) for deep gouges and nicks. 1. Remove the four crankcase cover cap screws (29) Also, inspect the cooling plate for any cracks or other securing the crankcase cover (28) to the crankcase damage.
  • Page 13 DISCHARGE JUMPER ASSEMBLY REAR COVER PLATE 1. Place the rear cover plate gasket (30) onto the rear Inspect the o-ring grooves on the discharge jumper (37) cover plate (32). Note: This should be the same surface for damage. Inspect the air passageways of the discharge that the old gasket was removed from.
  • Page 14 PART THREE: INLET & TOP COOLANT FITTING 2, 8 1, 7 5, 11 INSTALLATION If the inlet fitting (35) and/or the top coolant fitting (36) where previously removed, they should now be installed; otherwise skip step 13. 13. There are two options for the top coolant fitting (36). Identify the fitting you have from the two options shown in Figure 12a and follow the steps for installation.

  • Page 15: Installing The Compressor

    OPTION 1 OPTION 2 FIGURE 12A - TOP COOLANT FITTING OPTIONS Top Coolant Fitting 0°± 5° Coolant Fitting Orientation 20°–25° Inlet Fitting Orientation Inlet Fitting FIGURE 12 - REQUIRED ORIENTATION OF THE INLET AND TOP COOLANT FITTINGS INSTALLING THE COMPRESSOR 1.
  • Page 16 TESTING THE REBUILT COMPRESSOR 3. Inspect all air, oil, and coolant lines and fittings before reconnecting them to the compressor. Make certain In order to properly test a compressor under operating o-ring seals are in good or new condition, the threads conditions, a test rack for correct mounting, cooling, are clean, and the fittings are free of corrosion.
  • Page 17 BENDIX SNA-01 COMPRESSOR TORQUE SPECIFICATIONS: ® ™ SPECIFICATIONS ASSEMBLY TORQUES Compressor weight ..............41 lbs. M8x1.25-6g Cylinder Head ....270–305 in-lbs (30.5–34.5 N•m) Number of cylinders ................1 M5x0.75-6g Unloader Cap ......62–71 in-lbs (7-8 N•m) Bore diameter ............3.622 in. (92 mm) M8x1.25-6h Discharge Jumper ..115–133 in-lbs (13–15 N•m)
  • Page 19 (2) System Leakage ........A-14 Usage Guidelines (Table A) ..A-3 (3) Compressor Discharge and Air Dryer Inlet Temperature ...... A-15 (4) Governor Malfunction ......A-14 (5) Governor Control Line ......A-15 (6) Compressor Unloader ......A-15 Bendix BASIC Test Information ..A-16-18 ® ™...
  • Page 20 (less than 25%) duty cycle, operating in builds the air pressure for the air brake system. The air a temperate climate. See Bendix and/or other air dryer compressor is typically cooled by the engine coolant system manufacturer guidelines as needed.
  • Page 21 Discharge line upgrades are not covered under warranty. Note: To help prevent discharge line freeze-ups, shorter discharge line For Bendix Tu-Flo 550 and 750 compressors, unloader service is ® ® lengths or insulation may be required in cold climates. (See Bendix recommended every 250,000 miles.
  • Page 22 Discontinue using this test. Results Do not use this card test to diagnose compressor "oil passing" issues. They are subjective  and error prone. Use only the Bendix ® System Inspection Cup (BASIC ) test and the ™ methods described in this guide for advanced troubleshooting.
  • Page 23 Return the vehicle to service. An optional kit (Bendix piece number 5011327 for the Bendix AD-IS or AD-IP ® ® ® air dryers, or 5003838 for the Bendix AD-9 ® ® air dryer) is available to redirect the air dryer exhaust.
  • Page 24 Column 3. (1-800-247-2725), option 2, and speak to a (b) If the vehicle maintenance has  Drain all air tanks into Bendix BASIC test Tech Team member.) been performed as recommended cup (Bendix Air System Inspection Cup).
  • Page 25 45° fitting. For more information on how to help prevent Kinked discharge line shown. discharge line freeze-ups, see Bendix Bulletins TCH-008-021 and TCH-008-022 (Appendix B). Shorter discharge line lengths or insulation may be required in cold climates.
  • Page 26 Note: After all other operating conditions have been investigated. replacing a compressor, residual oil may Bendix compressors are designed to have a 'dry' take a considerable period of time to be sump and the presence of excess oil in the crankcase flushed from the air brake system.
  • Page 27 Symptom: What it may indicate: What you should do: 6.0 Excessive oil A problem with engine or other engine  See engine service manual. accessory. consumption in engine. The engine service manual has more information. 7.0 Oil present Air brake charging system is functioning  Air dryers remove water and oil from at air dryer normally.
  • Page 28 Bendix oil quality. These can increase the rate at which carbon Bulletins TCH-008-021 and TCH-008-022 builds up in the discharge line. Bendix recommends oil (Appendix B). Shorter discharge line soot (solids) be maintained at less than 3%.
  • Page 29 (d) Compressor malfunction.  Replace the compressor only after making certain the preceding conditions do not exist. * Note: For the Bendix DuraFlo 596 air compressor, not only ® ™ the governor, but also the SV-1 synchro valve used would ™...
  • Page 30 Symptom: What it may indicate: What you should do: 12.0 Air dryer (a) Restriction between air dryer and  Inspect the delivery lines to reservoir for safety valve reservoir. restrictions and repair as needed. releases air. (b) Air dryer safety valve  Verify the relief pressure is at the vehicle or malfunction.
  • Page 32 Symptom: What it may indicate: What you should do: (a) Compressor leaks air at connections 16.0 Compressor  Check for leaking, damaged or defective leaks air or ports. compressor fittings, gaskets, etc. Repair or replace as necessary. (b) Compressor unloader mechanism  Go to Test 6 on page A-15.
  • Page 33 Tests Test 1: Excessive Oil Leakage at the Head Gasket Exterior leaks at the head gasket are not a sign that oil is being passed into the air charging system. Oil weepage at the head gasket does not prevent the compressor from building air. Look Weepage Observe the amount of weepage from the head gasket.
  • Page 34 Tests (continued) Test 4: Governor Malfunction reservoir, service reservoir, or reservoir port 1. Inspect control lines to and from the governor of the Bendix governor, verify cut-in ® ® for restrictions (e.g. collapsed or kinked). and cut-out pressures are within vehicle OEM Repair as necessary.
  • Page 35 (Note that 30-90 days is the recommended air tank drain schedule for vehicles equipped with a Bendix air dryer that is properly maintained.) If, in cold weather conditions, the 30 day air tank drain schedule is longer Replace the Compressor.
  • Page 36 Footnote 2: To get an accurate reading for the amount of oil collected during a 30 day period, ask the customer not to drain the air tanks before returning. (Note that 30-90 days is the recommended air tank drain schedule for vehicles equipped with a Bendix air dryer that are properly maintained.) If, in cold weather conditions, the 30 day air tank drain schedule is longer than the customer's usual draining interval, the customer must determine, based on its experience with the vehicle, whether to participate now, or wait for warmer weather.
  • Page 37 Appendix B continued: Information about the BASIC Test Kit (Bendix P/N 5013711) ™ ® Filling in the Checklist for the Bendix Air System Inspection Cup (BASIC ) Test ™ Note: Follow all standard safety precautions. For vehicles using a desiccant air dryer.
  • Page 38 10 feet, insulate the fitting and the last one foot of the line. If the line is 15 feet, insulate the fitting and the last 3 feet of the line. © 2010 Bendix Commercial Vehicle Systems LLC All rights reserved. 3/2010 Printed in U.S.A. A-19...
  • Page 39 Page: 2 of 2 System Leakage Check the air brake system for excessive air leakage using the Bendix “Dual System Air Brake Test and Check List” (BW1396). Excessive system leakage causes the compressor to “pump” more air and also reduce the life of the air dryer desiccant cartridge.
  • Page 40 Appendix D Technical Bulletin Bulletin No.: TCH-008-022 Effective Date: 1/1/1994 Page: 1 of 1 Additional Cold Weather Operation Tips for the Air Brake System Subject: Last year we published Bulletin TCH-008-021 which provided some guidelines for “winterizing” a vehicle air brake system. Here are some additional suggestions for making cold weather vehicle operation just a little more bearable.
  • Page 41 Log-on and Learn from the Best On-line training that's available when you are 24/7/365. Visit www.brake-school.com. SD-01-10142 © 2015 Bendix Commercial Vehicle Systems LLC. All Rights Reserved. 06/2015.

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