Kohler LH630-775 Service Manual page 145

Install Crankshaft
1. Lightly lubricate the lips of crankshaft seal with
grease.
NOTE: Apply cellophane tape over the
crankshaft keyway to prevent cutting
the oil seal during installation.
2. Carefully slide the flywheel end of the crankshaft
into the crankcase through the oil seal. See Figure
11-5.
Figure 11-5. Installing Crankshaft.
Install Connecting Rods with Pistons and
Rings
NOTE: The cylinders are numbered on the
crankcase. Make sure to install the piston,
connecting rod and end cap into its
appropriate cylinder bore, as previously
marked at time of disassembly. Do not mix
the end caps and connecting rods.
NOTE: Proper orientation of the piston/connecting
rod assemblies inside the engine is extremely
important. Improper orientation can cause
extensive wear or damage.
1. Stagger the piston rings in the grooves until the
end gaps are 120° apart. The oil ring rails should
also be staggered.
Figure 11-6. Piston, Connecting Rod and End Cap
Detail.
2. Lubricate the cylinder bore, piston, and piston
rings with engine oil. Compress the rings of the
#1 piston using a piston ring compressor.
3. Lubricate the crankshaft journals and
connecting rod bearing surfaces with engine oil.
4. Make sure the "FLY" stamping on the pistons is
facing towards the flywheel side of the engine.
Use a hammer with rubber grip and gently tap
the piston down into cylinder as shown in
Figure 11-7. Be careful that oil ring rails do not
spring free, between the bottom of the ring
compressor and the top of the cylinder.
Figure 11-7. Installing #1 Piston.
5. Guide the lower end of connecting rod and
rotate the crankshaft to join the two. Install the
rod cap to the connecting rod using the two hex
flange screws and torque in increments to
11.3 N·m (100 in. lb.). See Figures 11-8 and 11-9.
Section 11
Reassembly
Cylinder #2
Cylinder #1
11.3
11