stalled torque converter can distort the
crankshaft and cause a crankshaft fail-
ure
Check the crankshaft distortion as fol-
lows:
A. Rotate the crankshaft clockwise until
the crankshaft counterweights at the
rear connecting rod journal are in the
six o'clock position.
B . Center punch a hole in the inside face
one
o f each c o u n t e r w e i g h t c h e e k ,
quarter of an inch from the lower end
of each counterweight, to support the
gauge.
Figure 11B-78. Crankshaft Distortion
G a u g e Mounted on Crankshaft
C. Install a gauge (Starret Co. No. 696
dial gauge or equivalent) in the cen-
22. Close all of the drains and fill the
ter punch holes in the cheek of each
c o o l i n g system.
in
shown
as
counterweight
Figure 11B-78.
23. After replacing the main or connect-
ing rod bearings or installing a new or
D. Set the dial indicator at zero, then
reground crankshaft, operate the engine
rotate the crankshaft approximately
as outlined in the run-in schedule at the
90 in both directions. Do not allow
e n d of the section.
the gauge to contact the connecting
Note and record
rod caps or bolts.
the dial indicator readings at the 3, 6
CRANKSHAFT OIL SEALS
and 9 o'clock crankshaft counter-
The
maximum
positions.
weight
allowable variation is 0.0045" total in-
Description
dicator reading.
An oil seal is used at each end of the
NOTE
crankshaft to retain the lubricating oil in
The sealing lips of the
the crankcase.
Remove the tool that was used to
oil seals are held firmly, but not tight,
rotate the crankshaft when taking
against the crankshaft sealing surfaces
the dial indicator readings.
by a coil spring.
The front oil seal is pressed into the
E. If the reading on the gauge exceeds
crankshaft front cover, and the lip of
0.0045", check the torque converter
t h e seal bears against a vibration damper
for improper installation and realign
inner cone on the end of the crankshaft,
a s necessary.
next to the lubricating oil pump drive
gear (see Figure 11B-79 on page 11B-53
18. Affix a new gasket to the oil pan
and Figure 11B-80 on page 11B-53).
flange and install the oil pan.
A single lip oil seal is used at the rear
19. Use a chain hoist and sling attached
The rear oil seal is
end of the engine.
to the lifting brackets at each end of the
pressed into the flywheel housing (see
engine and remove the engine from the
Figure 11B-81 on page 11B-53).
overhaul stand.
Oil leaks indicate worn or damaged oil
20. Install all of the accessories that
seals. Oil seals may become worn or
were removed.
damaged due to improper installation,
excessive main bearing clearances, ex-
21. After the engine has been completely
cessive flywheel housing bore runout or
reassembled refer to Section 11H and re-
grooved sealing surfaces on the crank-
fill the crankcase to the proper level on
shaft or oil seal spacers. To prevent a
the dip stick.
repetition of any oil seal leaks, these