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vacuum leak
I bought a 1994 Sea Ray SC2100 this spring. I had it winterized this
fall and the Marina told me the lower unit oil was milky white,
indicating water was leaked in. They filled the unit with new oil, ran
it for a few minutes and drained it again with the same results. They
then performed a pressure and vacuum test. The pressure test passed,
but the vacuum test failed. It would not hold a vacuum. I have never
had a boat fail either test or have water leak. Before moving forward
with a repair, I'd like to understand what could be the problem and the
estimated cost associated. Can someone offer me some advice? |
SueEZ
Dec 31
2006
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| The shaft seal is double lip seal. So one side is probably bad. Would be
the outside edge, and fishing line behind the prop will destroy the seal.
Only one I changed was on a 15hp mariner, and was not a huge or expensive
job. |
CalifBill
Jan 3
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| There are actually 2 seals on the propshaft. For the past 20 years or so
Mercruiser has been using a special seal for the outer one. It has a
stainless steel cover that is supposed to protect the seal from fishing
lines or weeds. It seems to work. I have removed some pretty nasty wraps,
behind the prop, with no seal damage. I'm not saying it couldn't happen
though. In a 12 year old drive I would expect any of the seals could be bad.
Often, when a seal goes bad, you find the shaft it seals has been grooved by
the seal and ruined.
Jim |
Jim
Jan 3
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| Sue, it sounds like you have a bad seal in the lower unit, and they do
wear out, it must be repaired. If you do not get it repaired be
prepared to pony up for a new lower unit next season. Put simply, the
water getting into the lower unit will corrode the working parts within
the lower unit, additionally, water is a poor lubricant, as it
displaces the gear lube the moving parts will wear out quickly. The
repair bill right now shouldn't be that bad (remember, it's a boat,
nothing is cheap when it comes to repairing one). So get the repair
done now, so you can enjoy the boat next season. John |
Capt
Dec 31
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| reseal time, maybe the former owner didn't service the drive seasonal? "SueEZ" <jmzurborg@fuse.net> wrote in message |
Lost
Jan 1
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| Ran it in the water? Or on a trailer? Cause they usually don't get water
in them unless they are in water. The exhaust water is not usually enough.
A few minutes is not usually enough either. Check for fishing line around
the prop shaft. That is a common problem. Did you see the oil? Sometimes
it takes a couple oil changes to get all the signs of water out as the oil
is thick and does not drain well. If it has a seal problem it will be the
input shaft, the prop shaft, or the shifter seals. Most people just replace
them all as it is diffcult to pin down the culprit. The seals are a pain to
remove as well. If you do some of your own work you could change the oil again and run it
for a while then check it. When I first got my boat it has some signs of
water in the lower unit. I changed the oil and have never had a problem
since. But I change the lower unit oil regularly. And check it for signs
of water regularly. If the original owner never changed the lower unit oil
they do sometimes eventually get a little water in them. Is this the same marina that services the boat for the prior owner? Thay
may be able to tell you the maintenance history. Have you had previous good
experiences with them? Marinas can be worse than car repair places. "SueEZ" <jmzurborg@fuse.net> wrote in message |
James
Jan 1
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| The big seal on the yoke is the prime suspect for a vacuum leak. Unless oil
leaks into the bellow, I wouldn't worry too much about that. James suggested
changing the oil again. I think that is a good idea. If the pressure test
passed, you might have a bad fill/drain seal. Removing the top cover for
inspection might reveal weather you should be optimistic that the internals
are OK. There's usually a magnet on the bottom drain plug. Anything
attached to it? was the oil inspected for suspended metallic particles? Any
debris in the oil collection pan? When the engine was running were there any
unusual noised from the stern drive? Did It shift OK? How did the gear oil
look when you bought the boat? It's going to cost you a couple of hundred beyond what you've already spent,
just to get an accurate estimate of repair costs. The good news is that prices on new replacement drives is way down. That
might be an alternative if the estimate is too high.
Jim |
Jim
Jan 1
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