222 POWER CYLINDERS
Top and Intermediate Compression Ring Grooves
Table 25 DT 466 Piston Ring Gauge Selection
Engine Rating
Ring / Groove Type Gauge Diameter, mm (in)
Top / keystone cross section 3.1 (0.122)
225 bhp and below
Intermediate / rectangular N/A
Top / keystone cross section 3.1 (0.122)
230 bhp and above
Intermediate / keystone cross section 2.8 (0.110)
Table 26 DT 570 and HT 570 Piston Ring Gauge Selection
Engine Rating
Ring / Groove Type Gauge Diameter, mm (in)
Top / keystone cross section 3.2 (0.126)
All 570 series engines
Intermediate / rectangular N/A
Figure 310 Measuring ring grooves with piston
ring gauge pins
1. Install the piston ring gauge pins into the top
compression ring groove. Make sure that the
gauge pins are parallel.
2. Use an outside micrometer to measure the
diameter of the piston over gauge pins. Record
the reading.
3. Repeat the procedure for the intermediate
compression ring groove, if its cross section
is keystone-shaped. If the ring groove has
a rectangular cross section, the height of the
groove must be checked with gauge blocks.
If either measurement exceeds specifications, the
piston ring groove is worn, and the piston must be
replaced. For two-piece pistons, replace only t
he
steel piston crown.
Oil Control Ring Groove
Figure 311 Measuring side clearance of oil
control ring groove
1. Place the edge of a new oil control ring in the
groove. Roll the oil control ring entirely around the
piston to ensure that the ring is free in its groove.
2. With the edge of the oil control ring still in the
groove, use a feeler gauge to check the side
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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