Weichai America Corp.
Revision: October 2018 21
E. Rotate the crankshaft (360°) until the number 6 piston is on the compression stroke and
the timing pointer on the front cover is in line with the “TDC” mark on the vibration
dampener.
F. Using Illustration 10, adjust the six (6) valves corresponding with the cylinder 6 “TDC”.
Insert the correct feeler gauge between the rocker arm and valve stem tip. Loosen the
locknut and turn the valve adjustment screw until the rocker are and valve stem tip
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 (0.02” gap)
(0.5 mm).
F. If the plugs have debris or wear or damage, replace with new plug.
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com
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