Connecting Rod - Mercury 15XD Service Manual

POWERHEAD

Connecting Rod

1. Check connecting rods for alignment by placing rods on a surface plate. If light can
be seen under any portion of machined surfaces, if rod has a slight wobble on plate,
or if a 0.002 in. (0.051 mm) feeler gauge can be inserted between any machined sur-
face and surface plate, rod is bent and must be discarded
a -
b -
c -
2. Overheating: Overheating is visible as a bluish bearing surface color that is caused
by inadequate lubrication or excessive RPM.
3. Rust: Rust formation on bearing surfaces causes uneven pitting of surface(s)
a -
Page 4-28
Feeler Gauge
Surface Plate
Even Downward Pressure
Pitting
c
b
a
a
51853
.
57126
.
90-826883R2 JUNE 1998