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ENGINE
PISTONS-RODS
2-41
toward top of piston. To avoid distortion of
rings use Ring Remover and Installer KMO
297-D for Series 40-50, or KMO 297-E for
Series 70. See figure 2-33.
5. Make sure that cylinder bores, pistons,
connecting rod bearings and crankshaft jour-
nals are absolutely clean, then coat all bearing
surfaces with engine oil.
r----COMPRESSOR AT TO P
O
F
SKIRT AND ALL
RINGS PRO PERLY
LOCATED IN RING
GROOVES
Figure
2
-39-Rings
Held in Place by Compressor
6.
Before installation of each piston and rod
assembly in cylinder
bore,
carefully place the
Flex-Fit oil ring in
t
he bottom groove and
com-
press it
with
a tapered sleeve ring compressor
of
proper size.
Make sure that inner surface of
compressor is clean, smooth and free of burrs.
The compressor must be pulled toward top of
piston to compress the Flex-Fit ring as well as
the other piston rings. See figure
2-39.
NOTE: Turn
each
ring so that gap is not in line
w
ith
gap of any other ring. Always locate the
open end of
compressor
diametrically opposite
the open end of Flex-Fit ring. If ring and com-
pressor openings coincide, the ring ends will
squeeze out and hang up on cylinder
bore.
7.
Insert rod and piston assembly into cylin-
der bore
with
hollow side of piston toward cam-
shaft. With ring compressor resting squarely
on top of cylinder crankcase, snap the piston
down into bore by using the thumbs as shown in
figure 2-40. An alternate method is to grip the
compressor firmly as if to close the gap, then
lightly tap the piston down with a hammer
handle.
If
the piston does not enter cylinder
bore without excessive force, remove the as-
sembly and check for the cause.
8.
Adj ust connecting rod bearings as de-
scribed in paragraph
2-21.
9. Install cylinder head
(par. 2-16), oil
pump (par. 2-30) and lower
crankcase.
10. When connecting steering tie rod to pit-
man arm, be careful to properly seat the bear-
ings around the ball stud and make sure that
the
pressed
steel dust cover properly covers
opening around ball
stud.
Turn tie rod plug up
solid then back off two turns and install cot-
ter
pin.
IMPORTANT
:
After installation of new pis-
tons and
ring s, care
should be used in starting
th
e engine
and in
running
it for the
first hour.
A void high speeds until the parts have had a
reasonable amount of break-in so that scuffing
will not occur.
Figure 2-40-Snapping Piston into Cylinder Bore
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