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 TM5-241O-237-34
3-11. CRANKSHAFT BEARINGS - REPLACE (Cont'd)
d. Installation
(5) Insert bearing installation tool
into the bearing journal oil hole
(1) If main bearings were coated with
until it engages the upper
lubricating oil subsequent to
bearing hole.
bearing cleaning, remove oil
with a clean lint free rag.
CAUTION
If the crankshaft is turned in
WARNING
the wrong direction, the tab
on the upper half of the
Compressed air used for
bearing will be pushed between
cleaning purposes will not
the crankshaft and bearing
exceed 30 psi. Use only with
area in the block. This could
effective chip guarding and
cause damage to the block and
personal protective equipment.
the crankshaft.
(2) Clean main bearing surfaces in
(6) Slowly turn the crankshaft in
the cylinder block with an
the correct direction until upper
approved cleaning solvent (See
bearing tab is in the notch in
cylinder block. Remove bearing
thoroughly with low pressure air
installation tool.
(30 psi or less).
(7) Put clean lubricating oil on the
(3) If a new crankshaft is being
thrust plates and install two
installed, new main bearings must
thrust plates (6), for the No. 7
be installed. If crankshaft was
bearing, with the words "BLOCK
ground to a smaller size, the
SIDE" toward the cylinder block.
The thrust plates have tabs which
correct new smaller size bearings
must be used. If a crankshaft
must be inserted into the
journal was polished, new
machined area in the block. The
bearings must be installed for
tabs prevent incorrect
that journal. If all journals
installation.
were polished, install all new
bearings.
NOTE
NOTE
Install bearing halves dry for
the following clearance
Install upper bearing halves
checks. Clean lubricating oil
dry for the following
will be applied later at final
clearance checks. Be sure
assembly.
cylinder block bearing bores
and backsides of upper
(8) Place lower half of main bearing
bearings are clean and dry.
(5) in the bearing cap (3). Tab
on bearing must be in the notch
(4) Position
upper bearing half (8)
in bearing cap.
over the
crankshaft journal such
that the
bearing tab will fit
into the
notch in cylinder block.
3-56
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