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Old 01-04-2016, 12:44 PM   #21
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I would not use an oring for the reason already cited. Without a machined groove that the oring resides in, you will be tightening the oring directly. That means you can't tighten the bolt very much without risk of completely trashing the oring which will of course defeat the purpose. On the other side, a bolt that isn't very tight is not very secure. I would also suggest going with a fiber washer.

The idea of using a tapered pipe thread is interesting. If you were sure you had enough "meat" around the hole it could solve a couple of problems at once.

Ken
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Old 01-04-2016, 01:06 PM   #22
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Use one of these: no, don't panic, just the small brass valve. Costs about $3.
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Old 01-04-2016, 01:28 PM   #23
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In addition to all the above suggestions this has been a topic discussed over many years on the Grand Banks Owners forum Grand Banks Owner's Resources. I believe you have to join to search the archives of that forum, but there have been many, many discussions of the best ways to solve this problem and solutions from people who work/worked with these engines for a living.
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Old 01-04-2016, 01:31 PM   #24
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I would not use an oring for the reason already cited. Without a machined groove that the oring resides in, you will be tightening the oring directly. That means you can't tighten the bolt very much without risk of completely trashing the oring which will of course defeat the purpose. On the other side, a bolt that isn't very tight is not very secure. I would also suggest going with a fiber washer.

The idea of using a tapered pipe thread is interesting. If you were sure you had enough "meat" around the hole it could solve a couple of problems at once.

Ken
I bought a couple of thick neoprene washers so that is solved.

Because there is no pressure in the sump and just the worry about loosening, I feel snugged against a compressible washer is satisfactory.

I think using a tapered and force required to seal set up could be a mistake in this aluminum case.

A couple threads and a decent washer should be all it takes.
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Old 01-04-2016, 02:10 PM   #25
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I think using a tapered and force required to seal set up could be a mistake in this aluminum case.
.
Use Loctite (or equiv) and it doesn't have to be tightened as much as you think. Plus, it only has to be tightened once if you can fit an elbow and /or drain valve.

However your plan sounds fine as well. I think there are several ways to solve this problem.
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Old 01-04-2016, 04:25 PM   #26
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Use Loctite (or equiv) and it doesn't have to be tightened as much as you think. Plus, it only has to be tightened once if you can fit an elbow and /or drain valve.

However your plan sounds fine as well. I think there are several ways to solve this problem.
True....

Being on the road limits me to a point.

If the 3/8 bolt works and there looks like there is more meat there, maybe next summer when I'm stationary for months with all sorts of support around...I may play with it. But I only have to drain it 2 more times this trip so I'll be satisfies if I could even just get it to seal well enough that a few drops an hour wouldn't bug me too much.
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Old 01-10-2016, 04:30 PM   #27
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Day one of running...7 hours and no leaks.

Drilled and tapped 5/16 hole for 3/8 bolt Tapping did not go well on engine because of awkward angle and seemingly very soft aluminum housing.

Did manage to get a solid 4 threads or so in housing started....bolt was cut to size but may have been a tad too long as snugging up on a single neoprene washer was not fun thinking stipping again. After over night set.... no leaks, drained and filled after swabbing for no errant shavings, added second washer and ran today.

In a couple three years, if all stays the same...I will get the pump overhauled and that hole tapped better with possible an "l" added to help in draining or a valve.

If another field repair is necessary this trip, Jay Leonards suggestion of pipe tapping with plug and drain assembly may happen.
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Old 01-11-2016, 07:23 AM   #28
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Well, good on you, at least you got it done. Not much room to work with that's for sure.
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Old 01-11-2016, 03:57 PM   #29
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Day 2 and not a drop leaking or loosening of the bolt. So far, so good.

Hilton Head is cold and windy but I will bet better than South Jersey!
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Old 01-11-2016, 07:22 PM   #30
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There you go. Solve the problem before it becomes a problem.
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Old 01-11-2016, 09:33 PM   #31
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If you go after something more elaborate let me know when as I will then work on something unimportant and since that Murphy guy loves working with with me so much he will leave you alone.

Luck and let us know how it goes.
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