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 2. Strike the end of bolt a sharp
bearing half and reinstall the lower half and the bearing cap.
blow with a 2 or 3 lb lead hammer.
Torque bolts to 190 ft lbs. Remove bolts and bearing cap,
3. Tighten to 300 ft lb torque and
then lift wire off the bearing and measure the thickness. If
strike the bolt again.
thickness of the flattened piece of wire exceeds 0.006 inch,
4. Tighten to a torque of between
replace upper and lower bearing halves.
290- 310 ft lb.
(d) Inspect rear main bearing thrust
(e) Install belt and beltguard (para 5-2).
washers for scoring. Replace defective thrust washers.
End thrust, as measured between crankshaft flange and the
e. Vibration Damper.
thrust washer, should be between 0.004 and 0.011 inch new,
(1) Removal.
and should never exceed 0.018 inch.
(a) Remove crankshaft pulley (d. above).
(3) Installation. Upper and lower bearing halves
(b) Remove two of the damper-to-hub
are not alike. Install as follows:
capscrews and lockwashers diametrically opposite each other.
(a) Lubricate the crankshaft journal, then
(c) Reinstall crankshaft bolt, then install
take the grooved bearing half drilled for lubrication, and start
puller and move damper enough to loosen the outer cone.
the plain end, (as opposed to the end with a tang) around the
Push damper back slightly, then use two thin shank
crankshaft journal so that when the bearing half is in place,
screwdrivers to pry outer cone off crankshaft.
the tang will fit into a groove in the bearing support.
(b) After upper rear main bearing half has
CAUTION
been placed, in a manner similar to (a) above, take two of the
Do not pound with a hammer, or pry with
serviceable thrust washer halves and slide one in each groove
other tools, in removing the viscous type
along side the upper half. Then, assemble the two lower half
damper from the crankshaft. To do so will
thrust washers over the dowel pins in the bearing cap. Install
dent the outer housing and cause the
the cap, lubricate the threads of the two bolts, and secure the
flywheel to turn at same speed as outer
cap. Do not torque at this time.
housing, thus making the damper
(c) After all bearings have been checked
ineffective.
The damper cannot be
and replaced if necessary, draw bolts up snug, then rap caps
repaired.
sharply to seat them properly. Tighten to a torque of between
180-190 ft lbs.
(d) Slide the vibration damper with damper
(d) Install the oil pump on locating dowel
hub as an assembly off the end of the crankshaft by hand.
pins, secure with four lockwashers and capscrews, then
(e) Slide the inner cone off the crankshaft.
tighten to a torque of 35-39 ft lbs.
(e) Use a new gasket and install the oil
CAUTION
pan.
Do not allow fuel oil to remain on the
(f) Refill the engine lubricating system (LO
rubber type vibration damper too long, but
55-1925-204-12-5).
blow dry immediately after cleaning. The
d. Crankshaft Pulley.
fuel oil may damage the rubber.
(1) Removal. Remove beltguard and belt, then
proceed as follows:
(2)
Cleaning and inspection.
(a) Remove bolt and washer from pulley.
(a) Wash the damper in clean fuel oil and
(b) Use a gear puller and remove the
blow dry with compressed air immediately.
crankshaft pulley from crankshaft. Withdraw machine key
(b) Inspect the rubber type damper to
from shaft.
assure that all rubber is firmly bonded to the metal parts at
(2) Cleaning, inspection, and repair.
each side. If the damper has been exposed to fuel oil,
(a) Clean the pulley in fuel oil and wipe dry.
lubricating oil, or excessive heat too long, the rubber may
(b) Inspect for cracks, or chips off edges of
have loosened. Inspect for dents in outer housing. Replace a
grooves. Replace defective crankshaft pulley.
damper with loosened rubber or dents in outer housing.
(3) Installation.
(3) Installation.
(a) Wipe shaft end clean, then position the
(a) Coat the lip of crankshaft front oil seal
machine key in keyway.
with a light grease.
(b) Slide the pulley on the end of the
(b) Slide the inner cone (fig. 5-34), tapered
crankshaft.
end pointing to front end of crankshaft, over the crankshaft
(c) Position the washer on bolt and thread
and against the seal.
the bolt into the crankshaft, drawing the pulley tight.
(d) Tighten pulley retaining bolt as follows:
1. Tighten to 180 ft lbs of torque.
5-40
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