Kohler Command Pro CV980 User Manual download pdf (Page 102)

Section 9

Inspection and Reconditioning

9.10

Replacement pistons are available in STD bore size,

and in 0.25 mm (0.010 in.), and 0.50 mm (0.020 in.)

oversize. Replacement pistons include new piston ring

sets and new piston pins.

Replacement ring sets are also available separately

for STD, 0.25 mm (0.010 in.), and 0.50 mm (0.020 in.)

oversize pistons. Always use new piston rings when

installing pistons. Never use old rings.

Some important points to remember when servicing

piston rings:

1. The cylinder bore must be deglazed before

service ring sets are used.

2. If the cylinder bore does not need reboring and

if the old piston is within wear limits and free

ȱȱȱěȱǰȱȱȱȱ¢ȱȱ

reused.

3. Remove the old rings and clean up the grooves.

Never reuse old rings.

4. Before installing the new rings on the piston,

place the top two rings, each in turn, in its

running area in the cylinder bore and check the

end gap. (See Figure 9-9.) Compare the ring gap

ȱȱęȱȱȱȱŗǯ

Figure 9-9. Measuring Piston Ring End Gap.

ȱ śǯȱ Ğȱȱȱȱȱǻȱȱ

middle) rings on the piston, check the piston-

to-ring side clearance. Compare the clearance

ȱęȱȱȱȱŗǯȱȱȱȱ

ȱȱȱȱęǰȱȱȱȱ

must be used. Refer to Figure 9-10.

Figure 9-10. Measuring Piston Ring Side

Clearance.

Install New Piston Rings

To install new 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 9-11). Install the

ĴȱǻȱǼȱȱęȱȱȱȱ

compression ring last. Refer to Figure 9-12.

Figure 9-11. Installing Piston Rings.

Piston Ring

Expander

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Kohler Command Pro CV980 User Manual Page 102

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