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TM 10-3930-671-24
4.5. Engine Valve Clearance Adjustment
Preliminary Service Preparation..................................................... F-79
General Procedures ...................................................................... F-79
Valve Clearance Check ........................................................... F-80
Valve Clearance Adjustment ................................................... F-80
TMD27 (2.7 L) Engine Procedures..... ........................................... F-81
Valve Tappet Clearance Adjustment
1.
Disassemble or move accessory components as
necessary for removal of valve cover.
2.
Remove valve cover.
3.
Check and re-torque cylinder head bolts, as
specified.
4.
Check and adjust tappets when clearance is
found to be incorrect.
5.
Reassemble valve cover and accessories.
NOTE
•
Prior to performing this service procedure,
It is recommended that you first: * Park
truck on a solid, level surface.
•
Lower forks or attachment fully down.
•
Return all controls to NEUTRAL, apply the
parking brake, and turn key switch OFF.
•
It is recommended to use a go/no go
feeler gauge.
Minimum Tools Required
•
Wrenches.
•
Pliers, or hose clamp tool.
•
Screwdriver, or valve adjustment tool.
•
Thickness (feeler) gauge
Preliminary Service Preparation
1. If truck has not been operating, start the engine
and warm it up to normal operating temperature.
Coolant temperature should be 176-194°F (80-
90°C).
2. Turn ignition key switch OFF.
3. Open and remove both side doors, and raise the
seat deck. Be sure the seat deck support is
securely latched.
General Procedures
1. Clean and remove all loose dirt from around
valve cover before removing.
2. Removal of all diesel fuel injectors will allow the
engine to be rotated more easily.
3. Be sure to blow dirt from around fuel injectors
prior to removal.
4. When specified, check and retighten cylinder
head bolts to the correct torque specification in
the
specified
tightening
sequence
before
adjustment of valve clearance.
5. Check and adjust valve clearance with engine
warm (at operating temperature) and stopped.
F-79
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