Cleaning And Inspection; Cleaning The Crankcase; Crankcase Ventilation - Navistar INTERNATIONAL DT 466 Service Manual

Cleaning and Inspection

Cleaning the Crankcase

CAUTION: To prevent engine damage, the oil cooler
must be replaced if there was a bearing failure. Debris
from a bearing failure cannot be removed from the oil
cooler.
NOTE: The best way to clean the crankcase during
engine overhaul is in a chemical bath or hot tank.
This removes all carbonaceous material and mineral
deposits that collect in the cooling passages. If the
hot tank is not available, use the following cleaning
procedure.
1. Clean all old gasket material from the surfaces of
the crankcase, if any.
Figure 374 Removing crankcase plugs
2. Remove the main oil gallery cup plug, located at
the rear of the crankcase by using a hammer and
chisel. Knockout main oil gallery cup plug.
WARNING: To prevent personal injury or
death, wear safety glasses with side shields.
Limit compressed air pressure to 207 kPa (30 psi).
3. With the plugs removed from the crankcase, clean
the crankcase as follows:
a. Use a nylon brush (Table 40) with soap and
water to clean oil galleries.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
CRANKCASE, CRANKSHAFT, AND CAMSHAFT
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
b. Clean cross drillings using a nylon brush
(Table 40) with soap and water.
c. Use filtered compressed air to blow out oil
galleries and cross drillings.
d. Clean all threaded holes with an appropriately
sized tap (Table 40).
4. Install a new main oil gallery cup plug as follows:
a. Clean the mating surfaces of the plug and
crankcase.
b. Apply Loctite® 262 to the outside edge of the
cup plug.
c. Use an arbor to drive the cup plug in. The
arbor must be approximately 6 mm (1/4 in)
smaller in diameter than the plug that is being
installed.
d. Recess the cup plug 3.2 mm (1/8 in).
5. Install new plugs in the rear of the crankcase.
WARNING: To prevent personal injury or
death, wear safety glasses with side shields.
Limit compressed air pressure to 207 kPa (30 psi).
6. Inspect the piston cooling tubes for damage and
blockage as follows:
a. Inspect both ends of the tube. Verify that
the flanged end next to the bearing saddle is
intact and the orifice end protruding from the
crankcase is not broken. Replace any tubes
that are damaged.
b. Hold tube under running water in a sink.
Water should stream out of tube end. If not,
blockage will have to be physically removed
by compressed air or piston oil tube must be
replaced.

Crankcase Ventilation

1. Place breather and tubing assembly (Figure 360)
into a solvent parts cleaner and disassemble.
2. Thoroughly clean all hoses, clamps, tubing,
check valve and breather assembly. Run solvent
through each end of the check valve to confirm
directional flow.
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