Final Drive / Propulsion
5.23
Pum p Alignm ent -- Continued
The pump must be mounted flush with the hull and intake scoop to ensure proper driveshaft alignment. Some
of the causes of mis-alignment are listed below. A mis-aligned pump increases stress on driveline components
such as the impeller and driveshaft (stripped splines), and pump bearings. Ventilation of the pump cavity may
also occur due to leakage of the large pump sealing O-ring. Check pump-to-hull alignment after installing pump
housing to hull or whenever splines are stripped on the impeller end of the driveshaft. A quick method of checking
for a pump mis-alignment problem is measuring the gap between the hull and pump housing with a feeler gauge.
The gap should not exceed .010² (.25mm). Pump-to-hull misalignment can be caused by:
S Improperly installed intake scoop (check ride plate - it should be flush with bottom of hull).
S Hull damaged in pump mounting area. Damage to hull may result if pump mounts are over-tight-
ened (often due to the use of air tools), or if studs are improperly installed in pump. If the hex
portion of the stud is not engaged properly in the pump housing recess, the hex portion of the
stud may protrude past the edge of the pump housing, and prevent the housing from seating fully
against the hull.
Intake Scoop
Pump Housing
Check For Gap Between
Pump And Hull
Ride Plate
Forward
Ride Plate Should Be Flush With Hull.
Check Intake Scoop Installation If Not Flush
Forward
Hull
To Next Page
Loading...
Need help?
General
