Weichai America Corp.
Revision: October 2018 21
locknut and turn the valve adjustment screw until the rocker are and valve bridge
contact the feeler gauge.
G. Tighten the locknut once the valve is adjusted properly. Remove the feeler gauge. A
very slight resistance should be felt when removing the feeler gauge.
NOTE
Ensure valve cover is completely seated and not resting on bolts or washers
adjacent to the valve cover.
H. Install gasket onto the valve cover and align the cover and gasket onto the cylinder
head. Tighten the valve cover mounting bolts. Ensure valve cover gasket is aligned
before tightening.
With #1 piston at “TDC”, adjust these valves to: Exhaust 0.8mm/0.031” / Intake 0.5mm/0.02”
INT EXH INT EXT INT EXH
#1@TDC
1
1
2
3
4
5
Illustration 9
With #6 piston at “TDC” adjust these valves to Exhaust 0.8mm/0.031” / Intake 0.5mm/0.02”.
EXH INT EXH INT EXH INT
#6@TDC
2
3
4
5
6
6
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. (Gap: 0.02”
/0.5mm)
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
Under-
tightened could cause the spark plug to overheat, resulting in pre
-
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com
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