Install Piston Rings; Top And Middle Compression Ring End Gap - Kohler Courage SV470 Service Manual

Some important points to remember when servicing
piston rings:
1. If the cylinder bore is within the wear limits (refer
to Section 1) and the old piston is within wear
may be reused.
2. Remove old rings and clean up grooves. Never
reuse old rings.
3. Before installing the rings on the piston, place
each of the top two rings in its running area in the
cylinder bore and check the end gap (see Figure

Top and Middle Compression Ring End Gap

New Bore
Top Ring..................... 0.15/0.40 mm (0.006/0.016 in.)
Middle Ring............... 0.30/0.55 mm (0.012/0.022 in.)
Max. Used Bore.........0.77 mm (0.030 in.)
Figure 9-13. Measuring Piston Ring End Gap.
middle) rings on the piston, check piston-to-ring
side clearance. The maximum recommended side
clearance for each ring is 0.04 mm (0.0016 in.). If
piston must be used. Refer to Figure 9-14.
Top Compression Ring-to-Groove
Side Clearance ................................0.04 mm (0.0016 in.)
Middle Compression Ring-to-Groove
Side Clearance ............................... 0.04 mm (0.0016 in.)
Inspection and Reconditioning
Figure 9-14. Measuring Piston Ring Side
Clearance.

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
Refer to Figure 9-15.
Piston Ring
End Gap
Mark
Oil Control Ring
(Three Piece)
Figure 9-15. Piston Ring Installation.
Section 9
Piston
Top Compression
Ring
Center Compression
Ring
Rails
Expander
9.11
9