Powerhead Inspection; Cylinder Head; Bearings; Cylinder Bore - BRP Evinrude E-TEC Series Service Manual

POWERHEAD

POWERHEAD INSPECTION

POWERHEAD
INSPECTION
For dimensions, refer to SERVICE SPECIFICA-
TIONS on p. 10.
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.

Bearings

Inspect upper and lower main bearings for excess
wear, nicks, or scratches. Replace if necessary.
178

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.
TYPICAL
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).
007757
1. Measurement areas
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 0.003 in. (0.08 mm).
007758
1
DR3482