205
POWERHEAD
POWERHEAD INSPECTION
10
POWERHEAD
INSPECTION
For dimensions, refer to SERVICE SPECIFICA-
TIONS AB MODELS on p. 12.
IMPORTANT: Before any inspection process
can begin, all internal components must be com-
pletely clean and free of contaminants.
Visually inspect all parts. Check for unusual wear
patterns, scuffing, or deterioration of aluminum
parts, heat-related discoloration of bearings and
bearing surfaces, and broken components.
Cylinder Head
Check for cylinder head warpage using a piece of
bar stock or machinist’s straightedge and a feeler
gauge set.
Cylinder head warpage must not exceed 0.006 in.
(0.15 mm) per inch of measurement. Replace
head if warpage exceeds this dimension.
Check fuel deflector pins for damage.
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.
Cylinder Bore
Use a Cylinder Bore Gauge to inspect each cylin-
der bore for an out-of-round, oversize, or tapered
condition. Be sure the gauge is perfectly 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).
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