Top And Intermediate Compression Ring Grooves; Oil Control Ring Groove - Navistar INTERNATIONAL DT 466 Service Manual

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Top and Intermediate Compression Ring Grooves

Table 25 DT 466 Piston Ring Gauge Selection
Engine Rating
225 bhp and below
230 bhp and above
Table 26 DT 570 and HT 570 Piston Ring Gauge Selection
Engine Rating
All 570 series engines
Figure 310 Measuring ring grooves with piston
ring gauge pins
1. Install the piston ring gauge pins into the top
compression ring groove.
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.
a rectangular cross section, the height of the
groove must be checked with gauge blocks.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
POWER CYLINDERS
Ring / Groove Type
Top / keystone cross section
Intermediate / rectangular
Top / keystone cross section
Intermediate / keystone cross section
Ring / Groove Type
Top / keystone cross section
Intermediate / rectangular
Make sure that the
If the ring groove has
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
If either measurement exceeds specifications, the
piston ring groove is worn, and the piston must be
replaced. For two-piece pistons, replace only the
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
Gauge Diameter, mm (in)
3.1 (0.122)
N/A
3.1 (0.122)
2.8 (0.110)
Gauge Diameter, mm (in)
3.2 (0.126)
N/A