138
POWERHEAD
ASSEMBLY
Coat the piston and cylinder bore with oil.
Place the piston in Ring Compressor,
P/N 339754, (P/N 339755 for oversize pistons).
Make certain that the rings are correctly posi-
tioned in their grooves with respect to the dowel
pins. Damaged pistons and broken rings may
result from imperfect alignment of the ring gap
and the dowel pins.
IMPORTANT: The piston rings must be cor-
rectly located on their dowel pins to prevent per-
manent powerhead damage.
Start the piston into bore of the cylinder with
deflector of the piston (sharp edge) toward intake
port side of the cylinder block.
IMPORTANT: Loosely install the cylinder head
to prevent the pistons from falling out.
If removed, oil and press a new lower main bear-
ing onto the crankshaft. When pressing on the
bearing, support the crankshaft between the two
lower counterweights and press against the let-
tered side of the bearing. Install the retaining ring
in groove of the crankshaft with sharp edge of the
ring facing away from bearing.
Oil the upper main bearing surface of the crank-
shaft. Slide the upper main bearing onto the
crankshaft with lettered side facing the flywheel
end of the crankshaft.
Install the center main bearing. Apply Needle
Bearing grease to the 23 needle bearings. Place
the bearings around the center main journal of the
crankshaft. Place the sleeves around the bearings
with retaining ring end of the sleeves facing fly-
COB1140
1. Piston, deflector
2. Intake port side
32406
2
1
COB1141
COB1142
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