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ridge, followed by 240 grit for finishing.  Then, wet crocus
then hoist engine high enough for access to oil pan and
cloth should be used for the polishing operation.
bearing caps.
3. If the ridges are greater than
(h) Block engine for safety, but leave hoist
0.001 inch, the crankshaft must be reground at higher
attached with strain on lifters.
maintenance.
(i) Remove oil pan.  and lubricating oil
4. Inspect crankshaft for cracks.
pump (c. (1) (d) above).
Replace a cracked crankshaft.
(j) Remove flywheel and housing (para 5-
5. Inspect the oil pump drive gear
(9) for cracks or broken teeth. If cracked, or teeth broken,
(k) Remove crankshaft front cover If.(1)
replace the oil pump drive gear.
above).
6. Inspect the crankshaft timing
(l) Remove the connecting rod bearing
gear (3) for cracks. or broken teeth. Replace a defective
caps, rods, (para 5-4).
timing gear.
(m)  Remove the main bearing caps (c. (1).
(d) Repair  a  crankshaft  by  replacing
(e) above), but tag them for identification at reinstallation and
components. Replace a defective crankshaft.
remove all, at this time.
(n) Remove crankshaft (10, fig. 5-31).
(3) Installation.
(2)  Cleaning, inspection, and repair.
(a) Clean the crankshaft by removing plugs
NOTE
from crankshaft and thoroughly cleaning all oil passages.
If a new crankshaft is to be installed, it
(b) Support the crankshaft on V-blocks at
must be, or have been, steam cleaned to
the front and rear journals, and check the alignment at the
remove rust preventive compound, and
adjacent intermediate journals by using a dial indicator.
meet the dimensional requirements shown
throughout subparagraph (2) above.
NOTE
When runout on adjacent journals is in the
(a) Install the grooved upper main bearing
opposite direction, the sum must not
halves in the cylinder block.
exceed 0.003 inch TIR (total indicator
(b) Apply clean engine oil to all crankshaft
reading).  When the runout on adjacent
journals. and place the crankshaft in cylinder block so that
journals of the four cylinder crankshaft is
the timing gear mark (R or L) meshes with the idler gear mark
in the same direction, the difference must
(c) Install the upper and lower halves of
not exceed 0.003 inch TIR. If the runout at
thrust washers on each side of the upper and lower rear main
journals No. 2 and 4 is greater than 0.002
bearing (c.(3) (b) above).
inch, or runout at journal No. 3 is greater
(d) Install lower bearing halves in bearing
than 0.004 inch, the crankshaft, must be
caps, then position bearing caps on like numbered journals.
replaced.
and secure with bolts (6, fig. 5-31) drawn up snug.
(e) Rap the bearing caps sharply with a
(c) Inspect journals for ridging caused by
soft hammer, and torque as described in c.(3) (c) above.
groove in upper bearing half. If a ridge of 0.0002 inch exists,
it must be removed before the bearings are reinstalled.
NOTE
Proceed as follows:
If  the  bearings  have  been  properly
1. Work a piece of crocus cloth, wet
installed, the crankshaft will turn freely
with fuel oil, around the circumference of the journal. Rotate
with bolts torqued to specifications.
the crankshaft frequently during this process to eliminate an
out-of-round condition.
(f) Use dial indicator installed at edge of
2. If the ridges are greater than
the crankshaft timing gear to measure crankshaft end play
0.0005 inch, first use 120 grit emery cloth to clean up the
5-43


 


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