Kohler Command CH20 Service Manual page 74

Reassembly
Install Governor Cross Shaft
1. Lubricate governor cross shaft bearing surfaces in
crankcase with engine oil.
2. Slide small lower washer onto governor cross shaft
and install cross shaft from inside of crankcase.
3. 6 mm governor shaft: Install plain washer and then
insert hitch pin into smaller, lower hole of governor
cross shaft.
8 mm governor shaft: Install nylon washer onto
governor cross shaft, then start push-on retaining
ring. Hold cross shaft up in position, place a
0.50 mm (0.020 in.) feeler gauge on top of nylon
washer, and push retaining ring down shaft to
secure. Remove feeler gauge, which will have
established proper end play.
Install Crankshaft
Carefully slide fl ywheel end of crankshaft through main
bearing in crankcase.
Install Connecting Rods with Pistons and Rings
Piston and Connecting Rod Details
A Cylinder 1
Connecting Rod Bolt Details
A
B
C
Type
A 8 mm Straight Shank
B 8 mm Step-Down
C 6 mm Straight Shank
74
B
A
B Cylinder 2
Torque
22.7 N·m (200 in. lb.)
14.7 N·m (130 in. lb.)
11.3 N·m (100 in. lb.)
KohlerEngines.com
NOTE: Cylinders are numbered on crankcase. Make
sure to install piston, connecting rod and end
cap into its appropriate cylinder bore as
previously marked at disassembly. Do not mix
end caps and connecting rods.
NOTE: Proper orientation of piston/connecting rod
assemblies inside engine is extremely important.
Improper orientation can cause extensive wear
or damage. Be certain pistons and connecting
rods are assembled exactly as shown.
NOTE: Align chamfer of connecting rod with chamfer of
its mating end cap. When installed, fl at faces of
connecting rods should face each other. Faces
with raised rib should be toward outside.
1. If piston rings were removed, see Disassembly/
Inspection and Service procedure to install new
rings.
2. Lubricate cylinder bore, piston, and piston rings with
engine oil. Compress rings of piston 1 using a piston
ring compressor.
3. Lubricate crankshaft journals and connecting rod
bearing surfaces with engine oil.
4. Make sure FLY stamping on piston is facing towards
fl ywheel side of engine. Use a hammer with a rubber
grip and gently tap piston into cylinder. Be careful oil
ring rails do not spring free between bottom of ring
compressor and top of cylinder.
5. Install inner rod cap to connecting rod using screws.
Three diff erent types of connecting rod bolts have
been used and each has a diff erent torque value. If
8 mm straight shank type bolts are used, torque in
increments to 22.7 N·m (200 in. lb.). If 8 mm step-
down bolts are used, torque in increments to
14.7 N·m (130 in. lb.). If 6 mm straight shank bolts
are used, torque in increments to 11.3 N·m
(100 in. lb.). Illustrated instructions are provided in
service rod package.
6. Repeat above procedure for other connecting rod
and piston assembly.
Install Camshaft
1. Liberally apply camshaft lubricant to each cam lobe.
Lubricate camshaft bearing surfaces of crankcase
and camshaft with engine oil.
2. Position timing mark of crankshaft gear at 12 o'clock
position.
3. Turn governor cross shaft clockwise until lower end
of shaft contacts cylinder. Make sure cross shaft
remains in this position while installing camshaft.
4. Slide camshaft into bearing surface of crankcase,
positioning timing mark of camshaft gear at 6 o'clock
position. Make sure camshaft gear and crankshaft
gear mesh, with both timing marks aligned.
24 690 30 Rev. G