SECTION H
Crankshaft and Main Bearings
CRANKSHAFT AND MAIN BEARINGS
The crankshaft runs in five pre-finished replaceable
shell bearings lined with aluminum tin.
Crankshaft end float is controlled by four thrust
washers which are located on both sides of the center
main bearing housing. 0.0075 in (0,19 mm) oversize
thrust washers are available which may he combined
with standard thrust washers to give an adjustment of
0.0075 in (0.19 mm) or when used on both sides of the
bearing housing, give an adjustment of 0.(15 in (0.,38
mm).
The main bearings are located in position by tabs
fitting into slots machined in the bearing housings.
Note:
Main
bearing
cap
setscrew
tabwashers have been deleted on
later engines. It is therefore no
longer necessary to replace these
tabwashers when fitting main hearing
cap setscrews. The tightening torque
for
these
setscrews
remains
unchanged.
To Remove Main Bearings and Thrust Washers
Under normal circumstances, by the time the main
bearings, require renewing the crankshaft will need to be
removed for regrinding. However,
Fig. H.1.
Removing a Main Bearing Cap.
Fig. H.2
Removing a Main Rearing Shell with the Crankshaft
"in situ.”
removal of main bearing and thrust washers can he
carried out without withdrawn the crankshaft. Proceed
as follows : —
1.
Remove the sump. sump strainer and the oil pump
suction and delivery pipes (see page L.3).
2.
Remove the two setscrews securing the main
bearing cap. Only remove one bearing cap at a
time.
3.
Slacken the setscrews on the remaining bearing
caps. To gain access to the rear main bearing
setscrews, the rear main bearing bridge piece must
be removed. This is secured by two recessed
setscrews to the cylinder block and the two lower
rear main oil seal housing securing setscrews.
Access to the front main bearing setscrews can be
achieved by removing the lubricating oil pump (see
Page L.3).
4.
Remove the lower half of the bearing from the
bearing cap and with a suitable piece of thin hard
wood push out the top half of the bearing by
rotating it on the crankshaft, apply the wooden strip
to the opposite side
