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09-19-2021, 03:57 PM | #1 |
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Join Date: Nov 2015
Location: North Pole, Alaska
Posts: 2,651
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1942 Mercury 29A rear main seal- surprise surprise!
Before I put the oil pan back on the Merc engine in the 1947, I thought I’d go ahead and change the front and rear main seals. I have a one piece modern seal from Speedway for the front, and I just pulled the rear cap off, and I got a surprise. There is no rear main seal. I guess I’ve just been doing too many 59 AB’s and 8BA’s
So that being said, is there anything I should do to it other than cleaning, before I put it back together? |
09-19-2021, 04:40 PM | #2 |
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Join Date: Jan 2011
Location: Central Ohio
Posts: 5,062
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Re: 1942 Mercury 29A rear main seal- surprise surprise!
Given the crankshaft you have in it, there isn't much more you can do. When I put later crankshafts in these engines (like 49-53 Merc cranks), I put the later 59AB type rear-main seal in as well. The later pot-metal seal-plates will work in the 42 engine - allowing you to use the rope-seals. The crankshaft will have a ground/polished seal surface in the area where you see the raised "slinger".
Another possibility (though I haven't closely inspected your type of crankshaft) - would be to have a crank grinder remove the slinger and grind in the later style seal surface - then switching out the two seal plates and use the rope seals. My bet is that this approach would work (and has probably been done before). Good luck! Last edited by Bored&Stroked; 09-20-2021 at 07:12 AM. |
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09-19-2021, 04:45 PM | #3 |
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Location: Queensland, Australia
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Re: 1942 Mercury 29A rear main seal- surprise surprise!
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1942 Mercury 29A rear main seal |
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