Weichai America Corp.
Revision: August 2019 23
With #4 piston at “TDC” adjust these valves to: WP04GNA Exhaust 0.3mm/0.012” / Intake
0.2mm/0.008”;
EXH INT EXH INT
#4@TDC
2
3
4
4
Illustration 10
7.Inspect Spark Plugs
A. Inspect high tension leads from coils for shorts, cracking and damage. (if used)
B. Remove/blow out any debris from the cylinder head spark plug hole before removing
the spark plug to prevent any debris falling into the combustion chamber.
C. Remove wires or coil on plug (COP) from spark plugs.
D. Remove the spark plug and inspect the electrode and threads for wear or debris.
E. If the plugs do not show wear or debris or damage, re-gap and reinstall (WP04GNA:
0.014”/0.35mm gap).
F. If the plugs have debris or wear or damage, replace with new plug.
CAUTION
Before installing spark plug, ensure plug and cylinder threads are clean and undamaged.
Torque spark plugs to specifications. Over-tightened can cause damage and removal of spark
plug difficult. Under-tightened could cause the spark plug to overheat, resulting in pre-ignition
and possible engine damage.
A. Install new spark plug. Torque to 18 – 20 ft. lbs. (25 – 28N·m)
B. Apply spark plug boot dielectric grease to inside of boot.
C. Reconnect the spark plug wire or COP to the spark plug in the proper order.
8. Check Air Filter
A. Inspect the air filter reminder.
B. Record the reading on the gauge.
C. If the reading is in the red, replace filter, and reset the gauge.
D. If the reading has decreased significantly from the last reading, check for leaks, holes
in the filter or leakage paths – replace/repair as necessary.
E. If filter minder is the same as last reading or higher but not in the red, leave filter in
place.
F. After each air filter check, record and reset the gauge.
NOTE: Do not attempt to blow out, jar debris loose, or otherwise tap filter in an attempt
to clean the filter.
WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM
GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM
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