237
POWERHEAD
POWERHEAD INSPECTION
11
Crankshaft
Measure the diameter of each crankpin and main
bearing journal. The lower main bearing journal
would only be measured if the bearing was
removed for another reason.
Visually inspect crankcase seal rings for wear,
grooves, or chipping. If rings appear worn, use a
micrometer to measure ring thickness.
Replace rings that are less than 0.154 in. (3.9
mm) thick.
Install seal rings in their original positions on
crankshaft after inspection.
Cylinder Bore
Use Cylinder Bore Gauge, P/N 771310, to inspect
each cylinder bore for an out-of-round, oversize,
or tapered condition. Be sure the gauge is per-
fectly square in the bore when measuring.
Measure each cylinder in at least two areas. Each
area should be measured twice. The difference
between the two measurements in each area is
the cylinder out-of-round dimension.
• The cylinder must not be out-of-round by more
than 0.004 in. (0.10 mm).
The dimensional difference between the two
areas is cylinder taper.
• The cylinder taper must not exceed 0.002 in.
(0.05 mm).
The difference between the measurements and
standard bore is cylinder oversize. For dimen-
sions, refer to SERVICE SPECIFICATIONS on
p. 10.
• The cylinder must not be oversized by more
than 0.004 in. (0.10 mm).
005281
1936
Measure as shown 46528
1. Cylinder taper DR3482
1
To Next Page
Loading...
Need help?
General
