Kohler Command CH20 Service Manual page 61

Cylinder Head Components
A Valve
E Cap
I Valve Spring
M Rocker Arm
Remove Valve Covers
Three valve cover designs have been used. Earliest
type used a gasket and RTV sealant between cover and
sealing surface of cylinder head. Second type had a
black O-ring installed in a groove on underside of cover
and may have metal spacers in bolt holes. Latest design
uses a brown O-ring, and bolt holes spacers are molded
in place.
1. Remove screws securing each valve cover. Note
position of any attached brackets or lifting straps.
2. Remove valve covers, valve cover gaskets or
O-rings and any brackets or lifting straps. Note
which side of engine has oil fi ll valve cover.
Remove Spark Plugs
Remove spark plug from each cylinder head.
Remove Cylinder Heads and Hydraulic Lifters
NOTE: Cylinder heads are retained using either screws
or nuts and washers on studs. Do not
interchange or mix components, as cylinder
heads may have diff erent machining, unique to
each fastening method.
NOTE: Exhaust lifters are located on output shaft side
of engine while intake lifters are located on fan
side of engine. Cylinder head number is
embossed on outside of each cylinder head.
24 690 30 Rev. G
B
A
C
B Stud
F Valve Stem Seal
J Valve Spring Retainer
N Rocker Arm Pivot
KohlerEngines.com
Disassembly/Inspection and Service
K
G
J
I
H
F
E
D
C Gasket
G Hydraulic Lifter
K Push Rod
O Valve Cover O-ring
1. Remove screws or nuts and washers securing each
cylinder head. Unless screws are damaged or
questionable, they can be reused. Discard nuts and
washers once removed; do not reuse. Studs (if
present) should only be removed if damaged or if
cylinder reconditioning is necessary. Once removed,
they must be replaced.
2. Mark position of push rods as either intake or
exhaust and cylinder 1 or 2. Push rods should
always be reinstalled in same positions.
3. Carefully remove push rods, cylinder heads and
head gaskets.
4. Remove lifters from lifter bores. Use a Hydraulic
Lifter Tool. Do not use a magnet to remove lifters.
Mark lifters by location, as either intake or exhaust
and cylinder 1 or 2. Hydraulic lifters should always
be reinstalled in same position.
P
O
N
M
L
D
H
L Valve Keeper
P Valve Cover
Spark Plug
Retainer
61