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Mercruiser Alpha 1 Gen 1 water pump service #4114432 06/03/16 05:13 PM
Joined: Mar 2004
Posts: 23,825
D
Donald Offline OP
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D
Joined: Mar 2004
Posts: 23,825
I have the lower unit pulled to replace the impeller. I found a YouTube video on doing the impeller and it suggested to forget the o-ring near the top of the shaft going to the upper unit. Apparently the shaft goes into a seal you end up not being able to set it properly into the seal if you use the o-ring ring.

In the Gen 2, there is no slot for an o-ring.


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Re: Mercruiser Alpha 1 Gen 1 water pump service [Re: Donald] #4114641 06/03/16 11:04 PM
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DoubleWasp Offline
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Yes. That ring does make it a bit of a dastard to get in there correctly and efficiently. Just leave it out.

Most of the A1G1's we service have long since had them left out.


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