Mercury MERCRUISER, Service Manual, Page: 411 / 566

6. Remove the rear oil seal.
Cleaning and Inspection
!
WARNING
Spin‑drying bearings with compressed air can cause serious injury or death. The bearings can explode, even if spun at very
slow speeds. Do not allow the bearings to spin when drying with compressed air.
1. Clean the metal parts in solvent and dry with compressed air.
2. Clean the gasket material and sealant from the sealing surfaces.
3. Inspect the bearing housing. Examine the surfaces where the bearings contact the housing for evidence of the bearing
outer races turning in the housing.
4. Inspect the seals in the bearing housing for signs of damage or leaks.
5. Rotate the bearing shaft in the bearing housing. Replace the bearing shaft assembly if the bearings feel rough or if either
end of the shaft wobbles.
6. Inspect the impeller housing surfaces where the impeller rides. Replace the impeller housing if significant grooves exist.
7. Inspect the wear plate for grooves and replace as necessary.
8. Inspect the pump impeller and replace it if any of the following conditions exist:
• Wear on the ends and tips of the blades
• Cracks in the area where the blades flex
• Cracks in the impeller hub
• Blade set (blades remain curved)
9. Inspect the pump pulley for bends or cracks.
10. Inspect the serpentine belt for excessive wear.
Seawater Pump Assembly
Installing the Bearing Shaft and Seals
If the bearing shaft and seals were removed from the impeller housing:
1. Orient the front of the rear seal toward the impeller housing.
Orientation of the rear oil seal
a - Seawater pump impeller housing
b - Grooved outside diameter of the rear oil seal
c - Back of the rear oil seal (spring side)
d - Shaft bearing
2. Using a suitable mandrel, press the seal to seat it in the housing.
a - Press
b - Suitable mandrel
c - Housing
3. Use 2‑4‑C with PTFE to lubricate the bearing shaft next to the rear shaft bearing, so that the lubricant is between the rear
oil seal and the rear shaft bearing when the shaft is installed.
56780
b
c
d
a
56788
a
b
c
All Models
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 6A-7