55
Disassembly/Inspection and Service
32 690 01 Rev. D KohlerEngines.com
Remove Spark Plugs
Remove spark plug from each cylinder head.
Remove Valve Covers and Cylinder Heads
Plastic Valve Covers with O-Rings
Remove screws securing each valve cover. Most valve
covers have screw hole spacers molded in place.
Remove valve covers and O-rings.
Stamped Steel Valve Covers with RTV Sealant
NOTE: Valve cover is sealed to cylinder head using
RTV silicone sealant. When removing valve
cover, use care not to damage gasket surfaces
of cover and cylinder head. To break RTV seal,
hold a block of wood against 1 at face of valve
cover. Strike wood rmly with a mallet. If seal
doesn't break loose after 1 or 2 attempts, repeat
procedure on other side.
1. Remove screws, or Torx screws securing each valve
cover.
2. Using a brass wire brush and gasket remover or
similar solvent, clean old RTV from surface of
cylinder head and valve cover.
Cylinder Head Components
A
B
D
C
J
E
F
H
I
G
L
M
N
O
K
P
Q
A Gasket B Valve C Cylinder Head D Spring Cap
E Valve Stem Seal F Valve Spring G Valve Spring Retainer H Valve Spring Keeper
I Stud J Spark Plug K Guide Plate L Push Rod
M Rocker Arm N Rocker Arm Pivots O Adjusters P O-Ring
Q Valve Cover
3. Sealing surface of stamped steel valve covers must
be checked for atness prior to reinstallation. Hold
valve cover down rmly against a at, level surface
or piece of glass, and check around entire perimeter
that a 0.012 in. (0.30 mm) feeler gauge cannot be
inserted anywhere. If gauge goes in anywhere,
cover needs to be replaced.
Remove Cylinder Heads
NOTE: Exhaust side is located on output shaft side of
engine, while intake side is located on fan side
of engine. Cylinder head number is embossed
on outside of each cylinder head.
1. Loosen rocker arm pivot screws, or inner setscrews
(T25 TORX) based on design, and back off rocker
arm adjusting nuts.
2. Mark location of push rods as either intake or
exhaust and cylinder 1 or 2. Push rods should
always be installed in same positions.
3. Remove screws securing each cylinder head.
Discard screws once removed. Do not reuse.
4. Remove cylinder head and head gasket.
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