Disassembly
Remove the impeller housing screws.
- Screws
Pull up on the driveshaft and remove the drive shaft with the water pump assembly from the gearcase. Remove the water pump assembly from the driveshaft.
Remove the impeller plate and gasket. Discard the gasket.
- Impeller plate
Remove the water pump grommet, all O-rings, and the shift rod bushing from the impeller housing.
Inspection
Check impeller for overheating, hub separation, and other wear or damage.
Check liner and wear plate for scoring, distortion, and impeller material transfer.
Inspect the housing for cracks or melting.
Make sure gasket surface is clean and smooth.
Assembly
Oil and install the shift rod bushing into the impeller housing.
- Shift rod bushing
Apply Triple-Guard grease to the shift rod O-ring and install below bushing.
Apply a thin bead of Adhesive 847 in the inner groove of the impeller housing and install a new impeller cup O-ring.
- Shift rod O-ring
- Impeller cup O-ring
Lightly coat the exterior of the impeller cup with Gasket Sealing Compound. Align tabs of impeller cup with location holes of impeller housing and install the impeller cup into the impeller housing.
- Tabs, impeller cup
- Location holes
Lightly coat the inside of the impeller cup with oil. With a counterclockwise rotation, install the impeller into the impeller cup.
IMPORTANT: The sharp edge of key slot in the impeller is the leading edge during rotation.
- Impeller
- Sharp edge
Apply Adhesive 847 to the outer seal groove of the impeller housing. Install a new seal into the groove.
- Seal
Lightly oil pinion splines of the driveshaft. Slide the driveshaft through the impeller housing and impeller until drive key flat of the driveshaft is below the impeller. Align drive key flat with groove of the impeller. Install the impeller drive key.
- Drive key
Sharp edge of the key is leading edge during driveshaft rotation. Slide the impeller housing down the driveshaft. Engage the impeller with the key.
- Driveshaft rotation
- Drive key
Make sure the impeller engages the impeller key. Serious powerhead damage will result if impeller key is not in place.
Lightly coat both sides of a new impeller plate gasket with Gasket Sealing Compound. Place gasket on the gearcase.
Place the impeller plate over the gasket.
Slide the driveshaft down into the gearcase and engage the pinion.
Turn the driveshaft until holes of the impeller housing are aligned with holes of the gearcase. Apply Gasket Sealing Compound to threads of the impeller housing screws. Tighten the screws to a torque of 60 to 84 in. lbs. (7 to 9.5 N·m).
Apply Adhesive 847 to outside of water tube grommet. Install grommet and locate grommet bosses into holes of impeller housing.
- Grommet
