Steering Pull Adjustment; Impeller Clearance Adjustment - Mercury 15XD Service Manual

JET DRIVE

Steering Pull Adjustment

The steering on some boats will have the tendency to pull towards starboard. This pulling
condition can be corrected by using a pliers and bending the ends of the exhaust fins (a)
1/16 in. (1.5 mm) toward the starboard side of the outboard.
a -

Impeller Clearance Adjustment

1. The impeller should be adjusted so there is approximately 0.030 in. (0.8 mm) clear-
ance between the impeller edge and liner. Operating the jet drive in waters that con-
tain sand and gravel can cause wear to the impeller blades, and the clearance will
start to exceed 0.030 in. (0.8 mm). As the blades wear, shims (a) located in the stack
outside of the impeller can be transferred behind the impeller. This will move the im-
peller further down into the tapered liner to reduce the clearance.
2. Check the impeller clearance by sliding a feeler gauge through the intake grate and
measure the clearance between the impeller edge and liner. If adjustment is required,
refer to Impeller Removal and Installation.
a -
Page 6B-20
Exhaust Fins
Shims
a
a
.03 in. (.8mm)
90-826883R2 JUNE 1998