Kohler command pro CH940 Service Manual page 71

Install Crankshaft
Carefully slide flywheel end of crankshaft through
bearing in crankcase.
Install Connecting Rods with Pistons and Rings
Piston Details
A
A
Side 1
C Top of Piston
NOTE: Cylinders are numbered on crankcase. Make
sure to install piston, connecting rod and end
cap into 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.
1. If piston rings were removed, refer to Disassembly/
Inspection and Service procedure to install new
rings.
2. Lubricate cylinder bore, piston, and piston rings with
engine oil. Compress rings of piston side 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 toward
flywheel 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.
Torque screws in increments to 11.6 N·m
(103 in. lb.). Illustrated instructions are provided in
service rod package.
Align chamfer of connecting rod with chamfer of its
mating end cap. When installed, flat faces of
connecting rods should face each other. Faces with
raised rib should be toward outside.
6. Repeat this procedure for other connecting rod and
piston assembly.
62 690 01 Rev. J
C
B
B
Side 2
KohlerEngines.com
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. 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.
Determining Camshaft End Play
1. Place a new closure plate gasket into position on
crankcase.
2. Position camshaft end play checking tool over
camshaft. Use a feeler gauge to check end play
between camshaft and end play checking tool.
Camshaft endplay should be between 0.3/1.3 mm
(0.011/0.051 in.).
3. No shim is typically used from factory. However, if
camshaft end play is not within specified range,
remove checking tool and shim as necessary.
Several color coded shims are available:
White: 0.69215/0.73025 mm (0.02725/0.02875 in.)
Blue: 0.74295/0.78105 mm (0.02925/0.03075 in.)
Red: 0.79375/0.83185 mm (0.03125/0.03275 in.)
Yellow: 0.84455/0.88265 mm (0.03325/0.03475 in.)
Green: 0.89535/0.99345 mm (0.03525/0.03675 in.)
Gray: 0.94615/0.98425 mm (0.03725/0.03875 in.)
Black: 0.99695/1.03505 mm (0.03925/0.04075 in.)
4. Reinstall end play checking tool and recheck end
play.
Install Closure Plate Crankshaft Bearing (PTO) and
Oil Seal
If bearing was removed in servicing, install a new
bearing using an arbor press and driver.
1. Make sure closure plate bore for bearing is clean,
dry and free of nicks or burrs.
2. Press closure plate side main bearing in place with
notch oriented in 12 o'clock position using an arbor
press and driver. Make sure bearing is fully seated
against flange.
3. Apply a light coat of clean engine oil to inner surface
of bearing.
Reassembly
71