TM 5-3805-281-24-2
Cylinder Block, Liners, Pistons, and Rods
CHECK PISTON RING GROOVE WEAR
Check grooves at several locations around the
circumference of piston.
1. Use the JDE55 Ring Groove Wear Gauge (A) to check
wear of top full keystone (compression) ring groove.
2. Use JDG852 Ring Groove Wear Gauge (B) to check
wear of middle half-keystone (compression) ring
groove.
If gauge shoulder contacts ring land of piston, ring
groove is worn. Replace piston and liner as a set.
If ring grooves are good (D), proceed with piston
inspection.
Checking Piston Ring Groove Wear
Checking Piston Top Ring Groove
Checking Piston Middle Ring Groove
A--JDE55 Keystone Ring Groove Wear Gauge
B--JDG852 Half-Keystone Ring Groove Wear Gauge
C--Piston With Good Ring Groove
D--Acceptable Clearance
E--Piston With Worn Ring Groove
F--Gauge Shoulder Contacting Piston Ring Land
Continued on next page
RG,RG34710,1121
1923OCT971/2
