Weichai America Corp.
Revision: October 2018 22
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.
G. Install new spark plug. Torque to 18 – 20 ft. lbs. (25~ 28N·m)
H. Apply spark plug boot dielectric grease to inside of boot.
I. 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.
9. Inspect Belts, Pipes, Clamps and Hoses
A. Inspect hoses, pipes, clamps, for loose connections, aging, corrosion or leak. Replace
the hoses/ pipes if necessary.
B. Check the belt for fraying or damage. Replace if necessary.
C. Look for fluid leaks under and around the engine.
10. Inspect Ignition System
A. Complete procedure #7 above, and also inspect coils for cracks, heat duress, and any
damage.
B. Ensure all connections are secure.
C. Ensure the high tension leads are routed around any heat sources, circuit boards or
sharp objects that might damage the leads or if COP assure tight mounting.
11. Check Coolant Conditioner
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com
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