9.10
Section 9
Inspection and Reconditioning
Figure 9-11. Piston Ring Installation.
1. Oil Control Ring (Boom Groove): Install the
expander and then the rails. Make sure the ends
of the expander are not overlapped.
2. Middle Compression Ring (Center Groove):
Install the center ring using a piston ring
expander tool. Make sure the identification mark
is up or the dykem stripe (if contained) is to the
le of the end gap.
3. Top Compression Ring (Top Groove): Install the
top ring using a piston ring expander tool. Make
sure the identification mark is up or the dykem
stripe (if contained) is to the le of the end gap.
Connecting Rods
Offset, stepped-cap connecting rods are used in all
these engines.
Inspection and Service
Check the bearing area (big end) for excessive wear,
score marks, running and side clearances (see Section
1, Specifications and Tolerances). Replace the rod and
cap if scored or excessively worn.
Figure 9-12. Valve Tappet.
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 aer
the oil pan is assembled to the crankcase. See Section
10, Reassembly, Oil Seal in Oil Pan.
Inspect the main bearing surface for wear or damage
(refer to Section 1 Specifications and Tolerances.
Replace the oil pan assembly if required.
Piston Ring
End Gap
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Mark
Dykem
Stripe
Piston
Top
Compression
Ring
Center
Compression
Ring
Rails
Expander
Oil Control Ring
(Three-piece)
Service replacement connecting rods are available in
STD size and 0.25 mm (0.010 in.) undersize. The
0.25 mm (0.010 in.) undersized rods have an
identification marking on the lower end of the
rod shank. Always refer to the appropriate parts
information to ensure that correct replacements are
used.
Valve Tappets
Inspection
Check the base surface of the valve tappet(s) for
wear or damage. Replace tappet(s) if condition is
questionable in any way. The corresponding camsha
lobe(s) should also be checked for wear or damage.
Whenever tappets are replaced, apply a liberal coating
of Kohler lubricant 25 357 14-S to the base of each new
tappet before it is installed.
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