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Old 11-08-2013, 22:34   #1
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Oil in the transmission box...er.

Hey Guys,
I won't sweet talk it....

Boat: 1972 (Capital Yachts) Newport 30' with an Atomic 4 Gas Engine.

Problem: Transmission problem, Transmission Box (engine running) oil comes squirting out of the thing.

Answer: First, you have to be a tiny monkey to get to the box. Then......er.

1. Let me know if this is supposed to happen?
2. Are there contortionist mechanics still around?

Thanks Guys.
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Old 12-08-2013, 17:50   #2
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Re: Oil in the transmission box...er.

#1 No
#2 No, at least not that I have found

Needs minimum new rear seal. You may have to pull the motor and tranny to repair.
Sorry.
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Old 12-08-2013, 17:59   #3
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Re: Oil in the transmission box...er.

Same on our (MSB) transmission. Different gear though.

Get your transmission drawings. You may be able to do a "top end" overhaul to replace the seal. This is anyways our case.

b.
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Old 13-08-2013, 10:21   #4
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Re: Oil in the transmission box...er.

You are aware that the Atomic 4 has a continuous, common oil sump and that the tranny is *supposed* to be half-filled with oil, right?

You haven't specified if oil is coming out around the tailpiece, or just from under the four-bolt transmission cover. Fixing the latter is a simple matter of acquiring or cutting a new cork gasket.

So more specifics, please.
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Old 14-08-2013, 10:22   #5
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Re: Oil in the transmission box...er.

Ha! Thank you! I didn't know the tranny has a sump. No oil out of the tailpiece, just when I take off the 4 bolt plate over the transmission, there is a steady stream of oil shooting out. Problem is the gears are slipping and I have a really tough time getting to them. I will review the you tube videos I have seen, other than that, I think it might be time to sell as, is......
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Old 14-08-2013, 10:43   #6
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Re: Oil in the transmission box...er.

The typical A4 gear box has an adjustment nut to tighten up the clutch plates. a few small set screws/bolts and you turn it to adjust the clutch. Easy and it needs to be done now and then.
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Old 14-08-2013, 15:51   #7
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Re: Oil in the transmission box...er.

Sailorchic is correct as usual. The adjustments are different for forward and reverse, but they are simple and if you remove the tranny plate and mount a small mirror, you can easily make the adjustments yourself. I did this earlier this year. Also, check your Morse cable mount: if the bracket (it's usually a L-shaped bracket on the rear bulkhead of the engine bay) is even a little loose, you can impart so much "slop" to the shifter throw that you can't find your gears with a searchlight.

Get the Moyer Marine A4 manual or the original A4 manual. There are others, such as E&C Marine's service manual or the yellow "Seacraft" book, that you can frequently find used.

Of course, it's up to you, but if I can, with no history of shop class and no record of car or motorcycle ownership, replace, rebuild, reinstall and maintain a 40-year-old Atomic 4 to a high standard of reliability, it cannot be that hard. You will not find a better inboard for short-haul, recreational sailing, either. Diesels don't make sense for "off the dock and head to wind in 10 minutes" sorts of sailing, not to mention that there isn't a diesel made that wouldn't cost more than even a mint condition Newport 30 of that era.
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