Weichai Engine WP6GNA Service Manual (EN)

WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM Assembly & Disassembly Manual Gas Engine Model: WP6GNA WEICHAI AMERICA CORP. GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM

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WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM Weichai America Corp. Purpose This manual is intended to inform customers on how to assemble and disassemble the Weichai America 6 Liters naturally aspirated engine. This document will be provided to customer so they can incorporate this information into their manuals and service documents. Maintenance Providers Maintenance and repair services may be performed by you or any qualified engine service provider that you choose. However, your engine warranty does not cover damage or failure caused by improper maintenance or repairs.

Owner’s Manual & Maintenance Records Storage & Use Store this Owner’s Manual and Maintenance Records in a safe, visible place by your engine. The maintenance log must be updated whenever your engine is serviced. If repairs are being done under warranty be sure to follow proper warranty procedures. (see Weichai America Corp Warranty Procedure Manual) Revision: August 2019 1 GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM

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WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM Weichai America Corp. Table of Contents 1 Disassembly & Assembly of Engine ..................................................................................... 5 1.1 Safety Precautions ............................................................................................................ 5 1.2 Environmental Protection Measures ................................................................................. 5 1.3 Notes for Disassembly and Assembly of Engine ...............................................................

5 2 Fuel System ......................................................................................................................... 6 2.1 Fuel System Assembly and Disassembly ......................................................................... 6 2.2 LPG Intake System Assembly and Disassembly ............................................................... 7 2.3 NG Shut-Off Valve Assembly and Disassembly ................................................................ 8 2.4 Electronic Pressure Regulator (EPR) Assembly and Disassembly ....................................

9 2.5 Mixer Assembly and Disassembly .................................................................................... 9 3 Intake and Exhaust System ............................................................................................... 12 3.1 Intake and Exhaust System Assembly and Disassembly ................................................ 12 3.2 Intake Manifold Assembly and Disassembly ................................................................... 14 3.3 Exhaust Manifold Assembly and Disassembly ................................................................ 14 3.4 Ignition System Assembly and Disassembly ...................................................................

16 3.5 Signal Generator Assembly and Disassembly ................................................................ 17 3.6 Engine Control Unit (ECU) Assembly and Disassembly .................................................. 19 4 Starting System ................................................................................................................. 19 4.1 Starting System Assembly and Disassembly .................................................................. 19 5 Engine Accessory System .................................................................................................

21 5.1 Engine Accessory System Assembly and Disassembly .................................................. 21 5.2 Alternator Assembly and Disassembly ............................................................................ 21 6 Closed Crankcase Ventilation (CCV) Breather System Assembly and Disassembly .......... 23 6.1 CCV Breather System Assembly and Disassembly ........................................................ 23 6.2 CCV Breather Assembly and Disassembly ..................................................................... 24 7 Cooling System ..................................................................................................................

26 7.1 Cooling System Disassembly and Assembly .................................................................. 26 Revision: August 2019 2 GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM

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WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM Weichai America Corp. 7.2 Fan Assembly and Disassembly ..................................................................................... 27 7.3 Thermostat Disassembly and Assembly ......................................................................... 28 7.4 Water Pump Assembly and Disassembly ....................................................................... 29 8 Front Cover Components ................................................................................................... 30 8.1 Torque Vibration Damper and Crankshaft Pulley Assembly and Disassembly ................

30 8.2 Gear Housing Assembly and Disassembly ..................................................................... 31 8.3 Intermediate Gear Assembly and Disassembly ............................................................... 34 9 Cylinder Heads and Valves ................................................................................................ 36 9.1 Lifting Lugs Assembly and Disassembly ......................................................................... 36 9.2 Cylinder Head Cover Assembly and Disassembly .......................................................... 36 9.3 Rocker and Rocker Shaft Assembly and Disassembly ....................................................

38 9.4 Tappet and Pushrod Assembly and Disassembly ........................................................... 39 9.5 Cylinder Heads Assembly and Disassembly ................................................................... 41 9.6 Assembly and disassembly of valve................................................................................ 44 10 Oil & Lubrication System ...................................................................................... 47 10.1 Assembly and disassembly of oil sump. ................................................................ 47 10.2 Disassembly and Assembly of Engine Oil Strainer ...............................................

48 10.3 Disassembly and Assembly of Lubricating System ............................................... 49 10.4 Assembly and disassembly of piston nozzle. ........................................................ 49 10.5 Disassembly and Assembly of Engine Oil Pump ................................................... 51 10.6 Disassembly and Assembly of Engine Oil Filter .................................................... 51 10.7 Disassembly and Assembly of Engine Oil Cooler ................................................. 52 10.8 Disassembly and Assembly of Main Oil Gallery Pressure Limiting Valve ..............

53 10.9 Disassembly and Assembly of Deputy Oil Pressure Limiting Valve ....................... 54 11 Crank-rod mechanism .......................................................................................... 55 11.1 Assembly and disassembly of flywheel housing .................................................... 55 11.2 Assembly and disassembly of flywheel and ring gear ........................................... 57 11.3 Assembly and disassembly of front oil seal and rear oil seal ................................. 59 Revision: August 2019 3 GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM

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