HEAVl EST COPPRESSION
RING
IN
TOP GROOVE
COMPRESSION RINGS
OIL CONTROL RING
*RAIL
I
EXPANDER
RAILS ARE NOT USED
ON TWO CYLINDER ENGINES
FIGURE
72.
PISTON RINGS
PISTON RING IN
FIGURE 73. CHECKING PISTON RING END GAP
Create a cross hatch pattern on the cylinder walls.
After de-glazing, be sure to completely clean the
cylinder walls and the rest of the engine to remove all
residue.
Connecting
Rods:
Clean each connecting rod and
check for defects. Check the upper connecting rod
bushings for proper piston pin clearance. Clearance
should be
.0002"
to
.0007".
Press out excessively worn bushings and install new
bushings. Press the new bushings- in until they are
centered in the connecting rod (Figure
74).
After
installation. drill the bushings with a 3/16-inch drill
through the counterbored hole
in
the connecting rod
top. Be sure the connecting rod oil spray hole is open.
3/16
"DRILL
IS
TO BE
THROUGH BUSHING
AFTER ASSEMBLY IN
ROD.
BUT BEFORE
BUSHING
IS
FINISHED
REAMED
BUSHING TO BE
ASSEMBLED WITH
SPLIT IN THIS
ZONE
CROSS-SECTION
PRECISION TYPE
BEARING
MEASURE CLEARANCE IN
DIRECTION INDICATED
BY ARROW
A752
FIGURE
74.
CONNECTING ROD BUSHINGS
Connecting
Rod
Bearings:
Inspect the connecting
rod bearings for burrs, breaks, pitts and wear.
Measure the clearance between bearings and the
crankshaft journal. The clearance should be
.001"
to
.003". If necessary, replace with new standard
or
oversize precision bearings. Refer to
Dimensions and
Clearances
section for journal size.
1.
Install the connecting rods on each piston with
pins and retaining pins. Install
so
the connecting
rod oil spray hole is on the same side as the
"V"
notch in each piston.
2.
Install all rings on each piston. Tapered-type
rings are marked "TOP"
or
identified in some
other manner. Place this mark toward the closed
end of the piston. Space the ring gaps 1/3 of the
way around the piston from one another.
No
gap
should be in line with the piston pin. Oil the rings
and pistons.
OF ENGINE
FIGURE
75.
PISTON TOP IDENTIFICATION
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