Checking Bearing Clearance
With
Plastigauge
The
most
accurate
means
of
determining
bearing
clearance is
by
using micrometers. However,
if
crank-
shaft
is
installed in engine, bearing clearance may be
measured by using a plastic strip (Plastigauge) manu-
factured for this purpose.
1, Make certain that all parts are marked or identified
so
that they are reinstalled in their original positions.
using aclean dry cloth, thoroughly clean all oil from
crankshaft journal and connecting rod.
2.
Place a piece
of
correct size Plastigauge in the
bearing cap the full width
of
the journal surfaceand
about
1
/4 inch
(6.35
rnrn)
off
center (Figure 24).
3.
Rotatethe crankshaft about30 degreesfrom bottom
dead center and reinstall the bearing cap; tighten
rod bolts
to
the torque specified in
ASSEMBLY
TORQUES
AND
SPEClAL
TOOLS.
Do
not turn the
crankshaft.
FIGURE
24.
MEASURING BEARING CLEARANCE
OIL
SEALS
The bearing plate must be removed
to
replace the oil
seal (Figure 25). Drive the oil seal out from the inside.
Before installing seals, fill thespace between lips with a
multi-purpose grease. This will impiove sealing.
When installing the gear cover oil seal, tap the seal
inward until it is .645 inch
(1
6.4 mm) from the front
of
the
gear cover.
When installing the bearing plate oil seal, tap the seal
into the bearing plate bore
to
bottom against the
shoulder in the
plate
bore. Use a seal expander
or
place
a piece of heavy paperaround theend of thecrankshaft,
when replacing the bearing plate
to
avoid damaging the
seal. Remove the paper as soon
as
the plate is in place.
4. Remove bearing cap.Theflauened Plastigaugewill
be found adhering
to
either the bearing cap or
crankshaft.
5-
Compare flattened
Plastigaugewiththegraduations
on Plastigauge envelope to determine clearance.
The number within the matching graduation on the
envelope indicates total clearance in millirnetres or
thousandths of an inch.
MOUNTING FACE
/
OF
GEAR COVER
FRONT
,645
INCH
THIS GEAR COVER SURFACL
SHOULD BE CLEANED OF ALL
OLD SEALING COMPOUND
BEFORE INSTALLING SEAL.
REAR BEARING PLATE
THIS SURFACE SHOULD BE
CLEANED OF ALL
OLD
SEALING COMPOUND
BEFORE INSTALLING SEAL
1
DRIVE
OR
PRESS
OIL
SEAL TO SHOULDER
OF THE PLATE BORE
u
GEAR COVER
OIL
SEAL
REAR
REARING
PLATE
OIL
SEAL
LS-1163
FIGURE
25.
GEAR COVER AND REAR BEARING PLATE
OIL
SEALS
10-15
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