77
Disassembly/Inspection and Service
66 690 14 Rev. A
KohlerEngines.com
Remove Cylinder Heads and Hydraulic 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.
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 Style A (Ribbed)
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.
2. Lay a rag or shop towel on table of drill press and
place lifter, open end up, on towel.
3. Lower chucked push rod until it contacts plunger in
lifter. Slowly pump plunger 2 or 3 times to force oil
out of feed hole in side of lifter.
Bleeding Lifters Style B (Smooth)
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. Lay a rag or shop towel on table of drill press. Place
an 8 mm (5/16 in.) socket on towel with well end up,
then place open end of lifter on socket. Ensure
socket does not contact lifter ball surface.
2. Place some material, such as wood, plastic, or
aluminum on top of lifter to protect lifter
fi
nish.
3. Lower drill press chuck until it contacts material on
lifter. Slowly pump lifter 2 or 3 times to force oil out of
feed hole in side of lifter.
Disassemble Cylinder Heads
NOTE: These engines use a valve stem seal on intake
and exhaust valves. Always use new seals when
valves are removed from cylinder head. Replace
seals if they are deteriorated or damaged in any
way. Never reuse an old seal.
1. Remove screws, rocker arms and pivots from
cylinder head(s).
2. Compress valve springs using a valve spring
compressor and remove valve spring keepers.
Remove compressor.
3. With keepers taken out following items can be
removed.
●
valve spring retainers
●
valve springs
●
valve spring caps
●
intake and exhaust valves
●
valve stem seals
4. Repeat above procedure for other cylinder head. Do
not interchange parts from one cylinder head with
parts from other cylinder head.
