Engine Service Manual

70
Disassembly/Inspection and Service
KohlerEngines.com 32 690 03 Rev. I
Remove Spark Plugs
Remove spark plug from each cylinder head.
Remove Valve Covers and Cylinder Heads
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 fl at face of valve
cover. Strike wood fi rmly with a mallet. If seal
doesn't break loose after 1 or 2 attempts, repeat
procedure on other side.
1. Remove 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.
3. Sealing surface of stamped steel valve covers must
be checked for fl atness prior to reinstallation. Hold
valve cover down fi rmly against a fl 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 inner setscrews (T25 Torx), and back off
adjusters.
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.
Disassemble Cylinder Heads
NOTE: Use a new valve stem seal whenever valve is
removed or if valve stem seal is deteriorated or
damaged. Never reuse an old valve stem seal.
1. Remove adjusters, pivots, rocker arms, studs and
guide plate from cylinder head.
2. Compress valve springs using a valve spring
compressor.
3. Once valve spring is compressed, remove following
items.
● Valve spring keepers.
● Valve spring caps.
● Valve springs.
● Intake and exhaust valves (mark position).
● Valve stem seal.
● Washer (intake valve only).
4. Repeat above procedure for other cylinder head. Do
not interchange parts from 1 cylinder head to
another.