Kohler l654 Service Manual - Page 27

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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-

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.

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gauge as it is withdrawn.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.

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