Main Bearings And Caps - Navistar INTERNATIONAL DT 466 Service Manual

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2. Tighten each main bearing bolt to 177
N·m (130 lbf·ft) using the recommended
torque sequence (Figure 395).
d. Remove one bearing cap and insert at a time.
Leave the remaining caps tight while checking
the fit of the bearing with the cap removed.
e. Wipe oil from all contact surfaces of the
exposed journal, bearing insert and cap that
is removed.
f. Place a piece of Plastigage® across the full
width of the bearing surface on the crankshaft
journal (or bearing insert) approximately 6
mm (¼ in) off center. Install the bearing cap
and tighten the cap bolt to 177 N·m (130
lbf·ft).
NOTE: Do not turn the crankshaft.
NOTE: In chassis service only:
bearing oil clearance is checked,
crankshaft will have to be supported and held
against the upper main bearing halves to get
a correct Plastigage® reading. Use a jack at
the crankshaft counterweight nearest to each
main bearing being checked to apply local
support. Failure to support the crankshaft will
result in inaccurate readings.
g. Remove the bearing cap and insert.
h. Do not disturb the Plastigage®. Use the scale
on the Plastigage® envelope to measure the
widest point of the flattened Plastigage®.
This reading indicates the bearing clearance
in thousandths of an inch or millimeters.
Figure 393 Measuring widest point of flattened
Plastigage®
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
CRANKCASE, CRANKSHAFT, AND CAMSHAFT
When
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
i. If the bearing clearance is not within
specifications,
replaced or reground and undersize bearings
installed.

Main Bearings and Caps

CAUTION: To prevent engine damage, use new main
bearing cap bolts whenever the bearing caps are
serviced.
NOTE: The thrust bearing located at number 7 is
found only in the upper half. All seven lower bearings
share the same part number.
1. Clean the Plastigage® from main bearing and or
crankshaft journal surfaces.
2. Coat all bearing surface journals with clean
engine oil.
the 3. Apply clean engine oil to main bearing bolts
(threads and under head).
4. Place the No. 1 through No. 7 main bearing caps
with the lower bearing inserts installed.
NOTE: Make sure the main bearings are installed with
the arrow pointing to the cam side and numbered from
the front of the engine to the rear.
Figure 394 Installing the main bearing caps
5. Align and seat each of the main bearing caps.
EGES-265-2
the crankshaft must be