Kohler COMMAND CH18-745 User Manual download pdf (Page 181)

10.10

Section 10

Inspection and Reconditioning

Piston Ring

Expander

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 of

score or scuff marks, the old piston may be

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 10-9.) Compare the ring gap to the

specifications listed in Section 1.

Figure 10-9. Measuring Piston Ring End Gap.

5. After installing the new compression (top and

middle) rings on the piston, check the piston-to-

ring side clearance. Compare the clearance to

specifications listed in Section 1. If the side

clearance is greater than specified, a new piston

must be used. Refer to Figure 10-10.

Figure 10-10. 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 10-11). Install the bottom (oil

control) ring first and the top compression ring

last. Refer to Figure 10-12.

Figure 10-11. Installing Piston Rings.

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Kohler COMMAND CH18-745 User Manual Page 181

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