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10.10
Section 10
Inspection and Reconditioning
Install Piston Rings
To install piston rings, proceed as follows:
NOTE: Rings must be installed correctly. Ring
installation instructions are usually included
with new ring sets. Follow instructions
carefully. Use a piston ring expander to install
rings (see Figure 10-10). Install the bottom
(oil control) ring first and the top compression
ring last. Refer to Figure 10-11.
1. Oil Control Ring (Bottom Groove): Install the
expander and then the rails. Make sure the ends
of expander are not overlapped.
2. Compression Ring (Center Groove): Install the
center ring using a piston ring installation tool.
Make sure the “pip” mark is up and the PINK
dykem stripe is to the left of end gap.
3. Compression Ring (Top Groove): Install the top
ring using a piston ring installation tool. Make sure
the “pip” mark is up and the BLUE dykem stripe is
to the left of end gap.
Connecting Rods
Offset Stepped-Cap Connecting Rods are used in all
these engines.
Inspection and Service
Check bearing area (big end) for excessive wear,
score marks, running and side clearances (refer to
Section 1, ‘‘Specifications, Tolerances, and Special
Torque Values’’). 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 the appropriate parts information to
ensure that correct replacements are used.
Oil Pan Assembly
Inspection
Inspect the oil seal in the oil pan and remove it if it is
worn or damaged. The new oil seal is installed after
the oil pan is assembled to the crankcase. See ‘‘Install
Oil Seal in Oil Pan’’ in Section 11.
Governor Assembly (Internal)
Inspection
Inspect the governor gear teeth. Replace the gear if it
is worn, chipped, or if any teeth are missing.
Inspect the governor weights. They should move freely
in the governor gear.
Disassembly
The governor gear must be replaced once it is
removed from the oil pan.
Figure 10-10. Installing Piston Rings With
Expander.
Piston
Ring
Piston
Top Compression
Ring
Center
Compression
Ring
Rails
Expander
Oil Control Ring
(Three Piece)
End
Gap
‘‘Top’’
Mark
Dykem
Stripe
TOP
Figure 10-11. Piston Ring Installation.