Worn/Dull Impeller; Steering Pull Adjustment; Impeller Clearance Adjustment - TOHATSU MD 35B2 JET Owner's Manual

M25 Jet Drive

Worn/Dull Impeller

The intake of gravel through the pump can round off and wear the leading edges of the impeller.
Some conditions that could be experienced from a worn/dull impeller are as follows:
• Noticeable performance loss, especially on acceleration
• Difficulty getting the boat on plane
• An increase in engine RPM at wide open throttle
IMPORTANT
a - Leading edge
b - Top side lifting angle

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 1/16 in.
(1.5mm) toward the starboard side of the outboard.

Impeller Clearance Adjustment

The impeller should be adjusted so there is approximately 0.8 mm (0.031 in.) clearance between
the impeller edge and liner. Operating the jet drive in waters that contain sand and gravel can
cause wear to the impeller blades, and the clearance will start to exceed 0.8 mm (0.031 in.).
: Do not sharpen or alter the top side lifting angle. Check the impeller
blades occasionally for damage. Use a flat file to resharpen the leading
edges. Sharpen to a 0.8 mm (1/32 in.) radius by removing material from
bottom side only.
a
b
13 13 13
a - Exhaust fin