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3.2 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
CAUTION:
Do not sharpen or alter the top side lifting angle. Check the impeller blades occasionally for damage. Use a
flat file to re sharpen the leading edges. Sharpen to a 0.8 mm (1/32 in.) radius by removing material from
bottom side only.
b
a
a - Leading edge
b - Top side lifting angle
