If it was the exhaust pipe, it has water in it when the engine is not running. When running it has less water, and more exhaust.
Back to the bellows. When it leaks and destroys the bearings in the bellhousing, when it's running, it wobbles. The seal on the engine side of the bellhousing can't seal against a wobbling shaft and water comes in. When it stops running the shaft sets there and the seal keeps the water out.
It won't be a lot of water, it has to pass 2 seperate seals, but when it vibrates and wobbles it does leak.
Who knows, with the spinning ujoints, it may push the water out of the bellows. But look at the picture, his arrow is way past the exhaust. It's in the bellhousing.
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what else should i do whilst engine is out and upper gearbox is off
Hi Graham;-)
As I wrote yesterday, control the valves and the ignition (you can start the engine outside the boat too). Does the oil look milky? Oil pan gasket all right?
what makes you say i may need a new bellhousing???
i dont suppose this will help on my quest but when thinking about the bellhousing bearings there was quite a bit of knocking coming from that area when in gear whilst on the water but when in gear on a hose there was no noise,also when engine running(not in gear) and leg trimmed all the way up the ujoint knocked a bit but stopped when leg was downHave seen a few of them that people just keep running that had the bellhousing all beat up so it wouldn't even hold new bearings. And no an car bellhousing will not work. Completely different setup.
Basically, take it apart and see EXACTLY what you need before ordering anything.
No water, no load on the shaft, sounds about right. And NEVER run it all the way up. The ujoints WILL contact the housing. That could be the cause of the problem to start with.