How to change water pump on Merc 60 BigFoot OB

[C Skip R]

Have changed water impellers on my Yamahas but never on my small 60hp Merc OB. Can someone tell me the process. Don't think I need the manual to do this.
Thanks

[C Skip R]

Well I attempted to do it without a manual and no knowledge. It turned out to be very simple and took me just over an hour to replace the water pump and gaskets. Only involves taking 5 bolts loose to remove the lower unit and 4 bolts to remove the impeller housing. Went back together as easy as it came apart.

[PF-88]

The manual tells you to push the shifter into forward gear before you take it apart and from experience try not to move that little shifter coupling out of position.

[Mud Runner]

From the Merc manual for the Big Foot.

1. Remove (and isolate) spark plug leads from
spark plugs.
2. Shift engine into forward gear.
3. Tilt engine to full “Up” position.
4. Remove fasteners.
5. Remove locknut and washer.

6. Remove gear housing.

Water Pump

1. If water tube seal stayed on water tube (inside of
drive shaft housing) when gear housing was removed,
pull water tube seal from water tube.
2. Replace water tube seal, if damaged.
3. Remove 4 bolts, washers, and isolators.
4. Remove cover.

IMPORTANT: The circular groove formed by the
impeller sealing bead should be disregarded
when inspecting cover (Step 5) and plate (Step 9),
as the depth of the groove will not affect water
pump output.

5. Replace cover if thickness of steel at the discharge
slots is 0.060 in. (1.52mm) or less, or if
groove(s) (other than impeller sealing bead
groove) in cover roof are more than 0.030 in.
(0.76mm) deep.
6. Lift impeller, drive key, and gasket from drive

shaft.

7. Inspect impeller. Replace impeller if any of the
following conditions exist:

•

Impeller blade(s) are cracked, torn, or worn.

•

Impeller is glazed or melted (caused by operation
without sufficient water supply).

•

Rubber portion of impeller is not bonded to impeller
hub.
8. Remove plate and gasket.
9. Replace plate if groove(s) (other than impeller
sealing bead groove) in plate are more than

0.030 in. (0.76mm) deep.

Sorry I couldn't add the pictures. Good luck.

[C Skip R]

Originally Posted by Mud Runner

From the Merc manual for the Big Foot.

1. Remove (and isolate) spark plug leads from
spark plugs.
2. Shift engine into forward gear.
3. Tilt engine to full “Up” position.
4. Remove fasteners.
5. Remove locknut and washer.

6. Remove gear housing.

Water Pump
1. If water tube seal stayed on water tube (inside of
drive shaft housing) when gear housing was removed,
pull water tube seal from water tube.
2. Replace water tube seal, if damaged.
3. Remove 4 bolts, washers, and isolators.
4. Remove cover.

IMPORTANT: The circular groove formed by the
impeller sealing bead should be disregarded
when inspecting cover (Step 5) and plate (Step 9),
as the depth of the groove will not affect water
pump output.
5. Replace cover if thickness of steel at the discharge
slots is 0.060 in. (1.52mm) or less, or if
groove(s) (other than impeller sealing bead
groove) in cover roof are more than 0.030 in.
(0.76mm) deep.
6. Lift impeller, drive key, and gasket from drive

shaft.

7. Inspect impeller. Replace impeller if any of the
following conditions exist:

•

Impeller blade(s) are cracked, torn, or worn.

•

Impeller is glazed or melted (caused by operation

without sufficient water supply).

•

Rubber portion of impeller is not bonded to impeller

hub.
8. Remove plate and gasket.
9. Replace plate if groove(s) (other than impeller
sealing bead groove) in plate are more than

0.030 in. (0.76mm) deep.

Sorry I couldn't add the pictures. Good luck.

Thanks even though I didn't need them its always nice to know I did it the right way.