against the bearing plate, and the flat surtace
of
the thrust washer goes against the shim.
6. Place the new bearing plate gasket in position
on the block, making sure the oil hole on the
back
of the block is exposed.
7. Install the rear bearing plate and fasten with
two
nuts (orcapscrews) tightened to the speci-
fied torque. Make sure the rear thrust washer
and shim(s} did not slip out
of
place during in-
stallation. The crankshaft should turn freely by
hand.
Endplay Checking Procedure
After tightening two rear bearing plate nuts (or
capscrews) to the specified torque, check the
crankshaft endplay at the point shown in Figure
9-30, using a feeler gauge.
MEASURE ENDPLAY HERE
(REFER
TO
DIMENSIONS
AND CLEARANCES)
CT1068s
FIGURE 9-30. CHECKING ENDPLA Y
1 . Lightly tap the front
of
the crankshaft with a
plastic-faced hammer to take up the freeplay.
Refer to the Dimensions and Clearances sec-
tion for the recommended crankshaft endplay.
2. If necessary, remove the rear bearing end
plate and add
or
remove shims
as
required.
3. install the end plate, and tighten all nuts (or
capscrews) to the specified torque.
9-18
4. Make sure the shim and thrust washer are in
place, and recheck crankshaft endplay. Verify
that the crankshaft turns freely without binding.
CYLINDER BLOCK
The cylinder block is the main support for all other
primary engine parts. The crankshaft and cam-
shaft are supported by the cylinder block, assuring
alignment of the crankshaft and cylinder bores.
Cylinder
Block
Cleaning
After removing the pistons, crankshaft, cylinder
heads, etc., inspect the block for cracks and ex-
treme wear.
If it is still serviceable, prepare it for
cleaning
as
follows:
1 . Carefully scrape all old gasket material from
the block. Remove oil bypass to allow cleaning
solution to contact inside
of
oil passages.
2. Remove grease and scale from the cylinder
block
by
agitating in a bath
of
commercial
cleaning solution
or
hot soapy washing solu-
tion.
3. Rinse the block in clean hot water to remove
cleaning solution.
Cylinder
Block
Inspection
When rebuilding the engine, thoroughly inspect the
block for any condition that would make it unfit for
further use. This inspection must be made after all
parts have been removed, and the block has been
thoroughly cleaned and dried.
1. Make a thorough check for cracks. Minute
cracks
may
be detected by coating the sus-
pected area with a mixture of 25 percent kero-
sene and 75 percent light motor oil. Wipe the
part dry and immediately apply a coating
of
zinc oxide (white lead) dissolved in wood alco-
hol.
If cracks are present, the white coating will
become discolored at the defective area. (Re-
move this coating after the test, and before
reassembly.) Always replace a cracked
cylin-
der
block.
2.
Inspect all machined surtaces and threaded
holes. Carefully remove any nicks
or
burrs
from machined surtaces. Clean
out tapped
holes and clean
up
any damaged threads.
3. Check the top of the block for flatness with a
straight-edge and a feeler gauge.
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