ENGINE - GENERAL SERVICES
CYLINDER HEAD SERVICE
After each 500 hours of operation,
the cylinder head should be taken off the engine and serviced.
Remove carbon deposits from combustion chamber in head.
piece of wood
Scrape and remove carbon with a sharp
--wood or similar material is suggested to avoid scratching machined surfaces of head.
Always use new cylinder head gaskets,
make sure head bolts are tightened in the proper sequence and
to the torque value stated in the Specification Section.
Before reinstalling the serviced heads, check
and adjust valve-tappet clearance per the following instructions.
VALVE ADJUSTMENT
Valve
- Tappet Clearance:
Poppet type valve mechanism is used on these engines. With this type,
each valve 1s spring held in the closed position until forced open by the action of the tappet which rides
on a cam of the camshaft.
clearance.
Tappets have self-locking setscre-ws f&r adjusting the valve- &em to tappet
Every 200 hours,
&move valve cover and check valve-tappet clearance.
ance should be . OOP on intake and . 011” on exhaust valves.
Cold (engine cold) clear-
ceed as follows:
To check and adjust clearance (cold) pro-
1.
Remove spark plugs then turn engine over until #I piston is at Top Dead ‘Center (observe through
spark plug hole) on compression stroke.
Both intake and exhaust valves will be closed at this
point.
2.
Insert feeler gauge between tappet and the end of- the exhaust valve.
If necessary, adjust clearance
by moving tappet setscrew so that very slight drag is felt on the feeler gauge as it is withdrawn.
Repeat procedure on intake valve on #I cylinder.
3.
Turn engine over until next piston is at TDC compression and repeat procedure in turn on each
cylinder until all valves are properly adjusted.
VALVE SEQUENCE
VALVES
CLOSED
GENERATOR END-
EXHAUST VALVE CLEARANCE .Oll-
IMTAKE VALVE CLEARANCE .008M
VALVE STEM
TO TAPPET-
CLEARANCE
.
FIGURf 8-l
-- VALVE SEQUENCE--VALYE TO TAPPET CLEARANCE
.
81 l
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