Disassembly/Inspection and Service
81
19 690 01 Rev. --
KohlerEngines.com
Remove Camshaft and Valve Tappets
1. Remove camshaft and shim (if used).
2. Remove valve tappets from crankcase and mark
them by their location, as either intake or exhaust
and cylinder 1 or 2. Tappets should always be
reinstalled in same position.
Camshaft Inspection and Service
Check lobes of camshaft for wear or damage. Inspect
cam gear for badly worn, chipped, or missing teeth.
Replacement of camshaft will be necessary if any of
these conditions exist.
Valve Tappet Inspection
Check base surface of valve tappet(s) for wear or
damage. Replace tappets(s) if condition is questionable
in any way. Corresponding camshaft lobe(s) should also
be checked for wear or damage. Whenever tappets are
replaced, apply a liberal coating of Kohler lubricant to
base of each new tappet before it is installed.
Remove Governor Cross Shaft (Mechanical
Governor)
1. Remove retainer and nylon washer, from governor
cross shaft.
2. Remove cross shaft through inside of crankcase.
Governor Cross Shaft Oil Seal (Mechanical
Governor)
Cross Shaft Oil Seal Details
B
A
A
2.0 mm (0.0787 in.)
B
Governor Cross Shaft Seal
If governor cross shaft seal is damaged and/or leaks,
replace it using these following procedures.
Remove oil seal from crankcase and replace it with a
new one. Install new seal to depth shown using a seal
installer.
Remove Connecting Rods with Pistons and Rings
NOTE: If a carbon ridge is present at top of either
cylinder bore, use a ridge reamer tool to remove
ridge before attempting to remove piston.
NOTE: Cylinders are numbered on crankcase. Use
numbers to mark each end cap, connecting rod
and piston for reassembly. Do not mix end caps
and connecting rods.
1. Remove screws securing closest connecting rod end
cap. Remove end cap.
2. Carefully remove connecting rod and piston
assembly from cylinder bore.
3. Repeat above procedures for other connecting rod
and piston assembly.
Connecting Rods
Offset, stepped-cap connecting rods are used in these
engines.
Inspection and Service
Check bearing area (big end) for excessive wear, score
marks, running and side clearances. Replace rod and
cap if scored or excessively worn.
Service replacement connecting rods are available in
STD crankpin size and 0.25 mm (0.010 in.) undersize.
Always refer to appropriate parts information to ensure
that correct replacements are used.
Summary of Contents for Command Pro ECV850
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