I found a YOUTUBE video that suggested NOT to use the o-ring on the top of the drive shaft from the lower unit. Basically the o-ring never gets set right into the seal. My lower unit have a slot for the o-ring. Use it or not?
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Mercruiser Alpha 1 Gen 1 water pump service
- Thread starter ddurand
- Start date
From my experience with outboards, the upper shaft O-Ring is there as a water slinger. Water can climb the spinning shaft, enter the spline, and wash the grease out. The grease is there to keep the male spline on the shaft from rusting into the female spline of the crankshaft. Or in this case, of the upper gearcase.
The above is my understanding of why the groove is there, so my Reason One to use it.
Reason Two? Playing "Let's outguess the Engineer" doesn't usually turn out as well as "Let's follow the Instructions."
If a practicing MerC Tech weighs in to the contrary, I would happily defer. There always could have been a service bulletin.
The above is my understanding of why the groove is there, so my Reason One to use it.
Reason Two? Playing "Let's outguess the Engineer" doesn't usually turn out as well as "Let's follow the Instructions."
If a practicing MerC Tech weighs in to the contrary, I would happily defer. There always could have been a service bulletin.
- Joined
- Jan 28, 2004
- RO Number
- 12714
- Messages
- 615
Alpha Gen I's have the groove so use the o-ring Gen II's no groove.