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Author Topic:   water pump on a 90 merc

JohnP posted 03-31-2003 08:33 AM ET (US)
Hi All,
I have a 2000, 90hp merc saltwater model and
its time to do the water pump on it. Anyone ever done one on this engine? I've never done one yet so I am not sure if its best to bring it to a shop or try it myself.
JP
fno posted 03-31-2003 08:54 AM ET (US)
I have a 90 four stroke and I doubt that the lower units are very different on the two. It's a realtively easy job to do. You do need metric tools: sockets, ratchet, etc. You just put the gear case in reverse, remove the 4-5 nuts under the cavitation plate, be careful as one hides in the zinc anode I believe. Do this with the motor trimmed down and a block of wood under the skeg. Carefully trim the motor up and pull down on the lower unit. Here it is handy to have two people, your wife will do in a pinch. After it's off you can see the stainless cover for the pump on the top. The driveshaft passes thru it. Remove the cover and you will see the impeller. Remove it, remember how the blades are bent for later and don't lose the key. Check the top and bottom parts of the SS housing for serious scoring. If there is then replace them too. If not put the new impeller on the driveshaft using some good marine grease on the key and shaft. Bend the impeller blades in the correc direction of rotation and slide the SS housing over it. Don't forget the gasket. Put grease on all your bolts and nut threads. A little vaseline on the impeller can't hurt. Slide the lower unit back up under the motor and lower the trim as you go. Then it is a matter of bolting it back up. P.S. don't lose any parts in the grass.
JohnP posted 04-01-2003 09:08 AM ET (US)
fno thanks,
seems like a pretty straight forward operation.
JP

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Author	Topic: water pump on a 90 merc
JohnP	posted 03-31-2003 08:33 AM ET (US) Hi All, I have a 2000, 90hp merc saltwater model and its time to do the water pump on it. Anyone ever done one on this engine? I've never done one yet so I am not sure if its best to bring it to a shop or try it myself. JP
fno	posted 03-31-2003 08:54 AM ET (US) I have a 90 four stroke and I doubt that the lower units are very different on the two. It's a realtively easy job to do. You do need metric tools: sockets, ratchet, etc. You just put the gear case in reverse, remove the 4-5 nuts under the cavitation plate, be careful as one hides in the zinc anode I believe. Do this with the motor trimmed down and a block of wood under the skeg. Carefully trim the motor up and pull down on the lower unit. Here it is handy to have two people, your wife will do in a pinch. After it's off you can see the stainless cover for the pump on the top. The driveshaft passes thru it. Remove the cover and you will see the impeller. Remove it, remember how the blades are bent for later and don't lose the key. Check the top and bottom parts of the SS housing for serious scoring. If there is then replace them too. If not put the new impeller on the driveshaft using some good marine grease on the key and shaft. Bend the impeller blades in the correc direction of rotation and slide the SS housing over it. Don't forget the gasket. Put grease on all your bolts and nut threads. A little vaseline on the impeller can't hurt. Slide the lower unit back up under the motor and lower the trim as you go. Then it is a matter of bolting it back up. P.S. don't lose any parts in the grass.
JohnP	posted 04-01-2003 09:08 AM ET (US) fno thanks, seems like a pretty straight forward operation. JP