REPAIR INSTRUCTIONS, PART 1
Page 227
Do not file or grind chrome-plated piston rings.
This may cause the chrome to flake, resulting in
ring failure.
KEYSTONE RING GROOVE CHECK
The keystone piston ring groove gauge J 29510
consists of two 0.120-inch (3.048 mm) diameter
pins connected at the ends by two springs
(Figure 235).
235
Figure 235 — Ring Groove Gauge
1. Place the pins of the keystone piston ring
groove gauge J 29510 opposite each other
in the groove to be measured. The pins will
be held in position by the springs.
2. Using a four- to five-inch micrometer,
measure the distance between the outer
edges of the two parallel pins. Check each
compression ring groove in two locations:
parallel and perpendicular to the wrist pin
bore (Figure 236). Record both
measurements.
3. Compare the readings with the tolerances
listed under Fits and Limits in the
SPECIFICATIONS section.
236
Figure 236 — Ring Groove Wear Measurement
1. Pins 2. Springs
5-111.bk Page 227 Monday, July 10, 2006 2:26 PM
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