tarheelebbtide
Petty Officer 3rd Class
- Joined
- Jul 4, 2008
- Messages
- 94
'93 Mercruiser 350 Mag 5.7 w/ carb, raw water cooled
Alpha One Drive (believe it to be gen II)
This is an issue I've had for two years now and have just worked around it. I plan to pull the drive, change impeller, change lube, etc next week. This will be my first time doing it myself.
Long story short, I had the engine rebuilt 2 years ago and the boat came back with a different drive than it left with. I noticed this because of the prop being different and then checked the serial number on the drive and it's a '96 model while the boat and engine are '93. It was all original when it left. After much arguing, I just gave up and took what he sent back (as it was performing just fine).
However, the boat won't pump water when on the muffs. In the water, it's just fine. If I lower the drive into a large tub, it's just fine. Put the muffs on though and the water simply runs out through the prop. Normally this wouldn't bother me but I'm planning to convert back to traditional exhaust (it's currently thru-hull) this winter as well. I have a sneaking suspicion that the path the water is currently taking to get out (as well as in I'd imagine) to the impeller may well be the exhaust outlet in the traditional setup. With thru-hull exhaust, that's obviously no issue (other than the pain of not being able to just throw muffs on it), but if I convert it back, I'm worried I'll be sucking air (and hot exhaust air at that) with my impeller.
Is there some sort of water dam somewhere in that lower unit that could be missing that's supposed to hold the water up there or do I have some other problem? Thanks in advance guys!
Alpha One Drive (believe it to be gen II)
This is an issue I've had for two years now and have just worked around it. I plan to pull the drive, change impeller, change lube, etc next week. This will be my first time doing it myself.
Long story short, I had the engine rebuilt 2 years ago and the boat came back with a different drive than it left with. I noticed this because of the prop being different and then checked the serial number on the drive and it's a '96 model while the boat and engine are '93. It was all original when it left. After much arguing, I just gave up and took what he sent back (as it was performing just fine).
However, the boat won't pump water when on the muffs. In the water, it's just fine. If I lower the drive into a large tub, it's just fine. Put the muffs on though and the water simply runs out through the prop. Normally this wouldn't bother me but I'm planning to convert back to traditional exhaust (it's currently thru-hull) this winter as well. I have a sneaking suspicion that the path the water is currently taking to get out (as well as in I'd imagine) to the impeller may well be the exhaust outlet in the traditional setup. With thru-hull exhaust, that's obviously no issue (other than the pain of not being able to just throw muffs on it), but if I convert it back, I'm worried I'll be sucking air (and hot exhaust air at that) with my impeller.
Is there some sort of water dam somewhere in that lower unit that could be missing that's supposed to hold the water up there or do I have some other problem? Thanks in advance guys!
