130 4 ENGINE SYMPTOMS DIAGNOSTICS
Figure 154 Piston cooling tube
2. Remove oil pan following the proc
edure in the
Engine Service Manual.
3. Inspect for missing, loose, plu
gged or damaged
oil pickup tube, pickup tube
gasket, piston cooling
tubes, bearing inserts, and
cam bushings.
• If unable to identify any dam
aged parts, Go to
“Pressurized Oil System Le
ak Inspection” in
this section.
Figure 155 Old piston cooling tube
Figure 156 New piston cooling tubes
1. New piston cooling tube (unknurle d) – DT 466
engines
2. New piston cooling tub e (knurled) – DT 570 a nd HT
570 engines
NOTE: The piston cooling tube was redesigned. The
new piston co o ling tube is lighter an d structurally
stronger. The piston cooling tu b es with knurling are
used on th e HT 570 and DT 570 engine. The pisto n
cooling tubes without knurling are used on the DT
466 engine.
Oil Pump Inspection
Figure 157 Oil pump housing cover
1. Outer gerotor
2. Oil pump housing plate
3. Inner gerotor
4. Oil pump housing
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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