Service Manual

49
Disassembly/Inspection and Service
66 690 01 Rev. C KohlerEngines.com
Remove Valve Covers
1. Remove screws from two lower valve cover
mounting locations on each side.
2. Remove valve covers and valve cover gaskets. Note
on which side oil fi ll or fuel pump is located, for
correct reassembly later.
Remove Spark Plugs
Remove spark plugs from cylinder heads using a spark
plug socket.
Remove Cylinder Heads and Valve Lifters
NOTE: It is not necessary to remove cylinder studs from
crankcase unless replacement is intended. If
studs are removed for any reason, discard old
stud(s), do not reuse/reinstall. Use new studs
and refer to assembly sequence for proper
installation.
1. Rotate crankshaft of engine until valves of one
cylinder are closed. Loosen rocker arm screws until
rocker arms can be pivoted to free push rods.
2. Remove push rods and mark their location as either
intake or exhaust, and cylinder 1 or 2. Push rods
should always be reinstalled in their original position.
3. Repeat for opposite cylinder.
4. Remove nuts and washers from cylinder head studs.
Carefully remove cylinder heads and head gaskets.
5. Remove hydraulic lifters using a hydraulic lifter
removing tool (do not use a magnet). Mark them
similar to push rods (intake or exhaust and cylinder 1
or 2). Hydraulic lifters should always be reinstalled in
their original location.
Hydraulic Lifters Inspection
Check base surface of hydraulic lifters for wear or
damage. If lifters need to be replaced, apply a liberal
coating of Kohler lubricant to base of each new lifter
before it is installed.
Bleeding Lifters
To prevent a possible bent push rod or broken rocker
arm, it is important to bleed any excess oil out of lifters
before they are installed.
1. Cut a 50-75 mm (2-3 in.) piece from end of an old
push rod and chuck it in a drill press.
Cylinder Head Components
A
B
E
F
G
H
I
J
K
L
M
C
D
N
A Valve B Head C Hydraulic Lifter D Push Rods
E Valve Stem Seal F Valve Spring Cap G Spring H Valve Spring Retainers
I Valve Spring Keepers J Rocker Arms K Rocker Arm Pivot L Rocker Arm Screw
M Valve Cover N Fuel Pump