201
POWERHEAD
POWERHEAD INSPECTION
10
POWERHEAD
INSPECTION
For d imensions, refer t o SERVICE SPECIFICA-
TIONS on p. 10.
IMPORTANT: Before any inspect ion pro cess
can begin, all internal components must be co m-
pletely clean and free of contaminants.
Visually inspect all p arts. Check for unusual wear
patterns, scuf fing, or dete rioration o f aluminu m
parts, heat-related d iscoloration of be arings a nd
bearing surfaces, and broken components.
Cylinder Head
Check for cylinder head warpage using a piece of
bar stock or mach inist’s straightedge and a feeler
gauge set.
Cylinder head warpage must not exceed 0.006 in.
(0.15 mm) per inch of me asurement. Re place
head if warpage exceeds this dimension.
Check fuel deflector pins for damage.
Crankshaft
Measure the diameter of each crankp in and main
bearing journal. The lower main be aring journal
would only b e measu red if the bearing was
removed for another reason.
Cylinder Bore
Use a Cylinder Bore Gauge to inspect each cylin-
der bore for an o ut-of-round, oversize, or t apered
condition. Be sure the gauge is perfectly square in
the bore when measuring.
Measure each cylinder in at least two areas. Each
area should b e measur ed twice. The dif ference
between the two measureme nts in each are a is
the cylinder out-of-round dimension.
• The cylinder must not be o ut-of-round by mo re
than 0.004 in. (0.10 mm).
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