User Manual

Page 5-16
200 BENCH PROCEDURES
Figure 5-13 — Ring Groove Wear Measurement
4. Perform steps 1, 2 and 3 on each piston.
Refer to Figure 5-14.
5. Check oil control ring.
a. Using a thickness gauge, check for
excessive wear of oil control ring
groove side clearance (1). Position a
new oil control ring in groove and insert
a thickness gauge between ring and
upper land of groove.
b. Record measurement and compare
reading with Fits and Limits chart to see
if it is within tolerance.
For a new ring and piston, oil ring side clearance
is 0.0016–0.0030 inch (0.0406–0.0762 mm). For
an old ring and piston, the clearance should not
exceed 0.0045 inch (0.1143 mm).
6. Perform step 5 on each piston.
Figure 5-14 — Side Clearance Measurement
201063a
POSITION GAUGE
IN RING GROOVE
WITH GAUGE PINS
ALIGNED WITH
WRIST-PIN BORE.
MEASURE DISTANCE
ACROSS PISTON AT
GAUGE PINS (PARALLEL
TO WRIST-PIN BORE).
REPOSITION GAUGE
90 DEGREES AND
MEASURE ACROSS PISTON
AT GAUGE PINS
(PERPENDICULAR TO
WRIST-PIN BORE).
5-101.bk Page 16 Friday, March 17, 2006 11:05 AM