Remove Spark Plugs; Remove Valve Covers; Remove Cylinder Heads And Hydraulic Lifters; Disassemble Cylinder Heads - Kohler Command PRO EFI Series Service Manual

Remove Spark Plugs

Remove spark plug from each cylinder head.

Remove Valve Covers

1. Remove screw and grommet securing each valve
cover.
2. Remove valve cover and seal from each cylinder
head. Note locations of individual valve covers if
they are diff erent.

Remove Cylinder Heads and Hydraulic Lifters

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.
1. Non-adjustable Valve Train
a. Remove rocker arm screws, rocker arm pivots
and rocker arms.
Adjustable Valve Lash
a. Loosen set screws and remove adjusting nuts on
rocker arm pivot studs.
b. Remove rocker arm pivot and rocker arms.
2. Remove pipe plug from cylinder head to access
screw in center location.
3. Remove screws securing each cylinder head. Note
locations of washers and spacer.
4. Mark position of push rods as either intake or
exhaust and cylinder #1 or #2. Push rods should
always be reinstalled in same positions.
5. Carefully remove push rods, cylinder head, and
head gasket.
6. Repeat procedure for other cylinder head.

Disassemble Cylinder Heads

NOTE: These engines use valve stem seals on intake and exhaust valves. Use a new seal whenever valves are
removed, or if seal is deteriorated in any way. Never reuse an old seal.
1. Non-adjustable Valve Train
Remove screws, rocker arm pivots, and rocker arms from cylinder head.
Adjustable Valve Train
Remove adjusters, rocker arm pivots, and rocker arms from cylinder head. Remove pivot studs and guide plate as
required.
2. Compress valve springs using a valve spring compressor.
3. Once valve spring is compressed, remove following items:
● Valve spring keepers.
● Valve spring retainers.
● Valve springs.
● Valve spring caps.
● Intake and exhaust valves (mark position).
● Valve stem seals.
4. Repeat above procedure for other cylinder head. Do not interchange parts from 1 cylinder head to another.
62 690 05 Rev. E
Disassembly/Inspection and Service
7. 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.
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.
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