95
10. Rotate the crankshaft to make certain that no binding
exists.
11. If pistons were removed from connecting rods,
install the pistons onto the connecting rods making
sure the piston pin retainer clips are properly seated
and the open ends are orientated facing downward.
DE371A
12. Check piston ring gap by installing the ring in the
cylinder bore and using a piston turned upside down,
push the ring down 25 mm (1.0 in.) into the piston
bore.
DE374
13. Using an appropriate thickness gauge, measure the
ring end gap. End gap must be according to specifi-
cations.
DE375
NOTE: If ring gap is less than specified, install the
ring in a soft-jawed vise and use a fine flat file to file
the ends of the ring, checking end gap frequently.
14. After all piston ring end gaps are within specifica-
tions, install the rings on the pistons using the fol-
lowing procedure.
A. Place the oil expander ring in the 3rd (bottom)
ring groove; then install the oil scraper ring over
the expander making sure the oil scraper ring end
gap is not directly in line with the expander spring
ends.
B. Install the 2nd (middle) compression ring in the
middle ring groove with the TOP or UP markings
on the ring directed toward the top of the piston.
C. Install the 1st (top) compression ring in the top
ring groove with the TOP or UP markings on the
ring directed toward the top of the piston.
NOTE: The top compression ring is full chrome (sil-
ver) and the middle compression ring has a partial
chrome band on the bottom side. Both rings have a
chamfered inner radius. The chamfer must be
directed upward.
0742-252
15. Remove the connecting rod caps keeping bearing
inserts in place; then position the rings on the pistons
as shown in the following illustration.
0742-253
16. Apply clean engine oil to the rings and cylinder wall;
then using a suitable ring compressor, compress the
rings sufficiently to install the piston in the cylinder.
