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What's it for?

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Harold R
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What's it for?

Postby Harold R » Sun Apr 03, 2005 9:25 am

I ran across this from the engine block from a '49. The motor has been recently overhauled, so I put it in my '74, whose motor had blow-by really bad, stuck valve, and just general malaise. Anybody have an idea what this pipe plug is there for?

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Dave in Md
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Postby Dave in Md » Sun Apr 03, 2005 9:31 am

I just checked mine, I don't have a plug but there is a detent in the casting in that same location and seems to be the same size as the plug in your pic.
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Lurker Carl
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Postby Lurker Carl » Sun Apr 03, 2005 12:00 pm

I checked all 3 Cubs - none of them have a pipe plug there or any obvious sign of one. The 1948 doesn't even have that angled 'brace' cast between the filter canister and the block where your pipe plug is. The contour between the canister and the block is uniform. But the 1952 and 1962 have the brace.

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Only the 1962 has the round plug cast on the bottom of the filter canister that might interfere with a 12V starter.

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Jim Becker
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Postby Jim Becker » Sun Apr 03, 2005 12:17 pm

That plug got discussed to no conclusion back when NOSIH had the NOS engine blocks, as they had the plug. My guess is it was used in some non-tractor power unit installation.
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Harold R
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Postby Harold R » Sun Apr 03, 2005 8:08 pm

Carl, that's the mold mark that's giving me trouble. Mine is a good 1/8 inch thick. The grinding wheel will take care of it, I just hate grinding to make something fit. :roll:
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Buzzard Wing
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Postby Buzzard Wing » Sun Apr 03, 2005 8:15 pm

HR, one possiblility is that it is so you could tap into the oil pressure and used it to lube something else??

I would have to look at the lube chart in the manual to see if there is pressure on the top of the filter.
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John *.?-!.* cub owner
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Postby John *.?-!.* cub owner » Sun Apr 03, 2005 8:17 pm

Since the oil pressure gauge comes off the top, there would be pressure at the top.
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Jim Becker
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Postby Jim Becker » Sun Apr 03, 2005 10:05 pm

Unscrew it and see what is inside. I was thinking it might go into the water jacket.
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Harold R
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Postby Harold R » Sun Apr 03, 2005 10:39 pm

I'll take it out tomorrow, since I don't have any fluids in the engine.
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'Country' Elliott
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Postby 'Country' Elliott » Mon Apr 04, 2005 6:20 am

I agree with Jim...that the mystery plug is an additional drain to the water jacket :wink: .
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Harold R
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Postby Harold R » Mon Apr 04, 2005 8:46 pm

I tried for about a 1/2 hour to get that plug loose. It's in a corner such that I couldn't get a pipe wrench on it. I did however get an end wrench on it, but pulling hard, plus a couple of good wraps with a hammer yeilded nothing. I decided to let a sleeping dog lay. I too agree it goes into the water jacket. Probably rusted in place. If it were oil behind it, probably would have come loose.
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Jim Becker
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Postby Jim Becker » Mon Apr 04, 2005 8:55 pm

hr's49cub wrote:If it were oil behind it, probably would have come loose.

AGREED!!!!!!
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