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11-08-2021, 09:24 PM | #1 |
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Merc crank clean out plugs
Hey guys, so I told the guy I needed a tap and a plug for a 5/8 hole, this is what I got,
Is the correct tap and plug size ? Thanks .. |
11-08-2021, 09:52 PM | #2 |
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Location: Rochester Wa
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Re: Merc crank clean out plugs
Not by my standards. 3/8" and 5/8" are 1/4" apart in size. Perhaps someone misunderstand.
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11-08-2021, 10:04 PM | #3 |
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Re: Merc crank clean out plugs
The nominal OD of a 3/8" pipe is 0.675" and the tap drill size for 3/8" NPT threads is 37/64", so the 3/8" pipe plugs might work for your application.
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11-08-2021, 10:23 PM | #4 |
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Re: Merc crank clean out plugs
I pretty much get all this, but without going down to the shop, did the 4" crank use some kind of press in plugs originally? Won't these threaded plugs change the balance? I have a recently turned merc crank and it came back witout plugs and IIRC it's up to me to clean out the chips. I think threaded plugs would be more secure. Keep up the discussion on the drill/tap/plug combination and I will assume an allen head type pipe plug. Thanks!
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
11-08-2021, 11:17 PM | #5 |
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Re: Merc crank clean out plugs
Nothing wrong with the proper press in plug. They've lasted for at least 70 years in these engines.
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11-08-2021, 11:52 PM | #6 |
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Re: Merc crank clean out plugs
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11-09-2021, 12:54 AM | #7 |
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Location: ottumwa Ia.
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Re: Merc crank clean out plugs
When I did my Merc.crank I ordered the plugs from Summit nice alum.plugs.Cliff.
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11-09-2021, 01:46 AM | #8 |
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Re: Merc crank clean out plugs
I made them from soft aluminum on my lathe.
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11-09-2021, 08:06 AM | #9 |
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Re: Merc crank clean out plugs
I got brass ones on amazon. Came in a set of 5. I used the 5th one for the hole behind the cam gear. For some reason or other the chinese cast iron ones from the hardware store did not fit but the brass ones went in nicely. One has slightly better tolerances I guess or it is the tap I had. Either way the cast iron ones are a hare bigger.
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11-09-2021, 03:22 PM | #10 |
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Join Date: Oct 2019
Location: Carthage , Tennessee
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Re: Merc crank clean out plugs
Yes,,,,3/8 pipe thread is the correct size for Merc clean out hole .
Just take your time with the tap,,,,,these cranks are fairly hard . Tap a little and clean out shavings some,,,,,it’s not too hard,,,just make sure to tap deep enough for the plug to screw in pretty flush . I like to use Tap Magic for lube,,,it taps better . Or use stock type cup plugs,,,they work fine as well . Tommy |
11-09-2021, 03:53 PM | #11 |
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Re: Merc crank clean out plugs
And I will assume some loctite whichever route I choose?
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
11-09-2021, 04:31 PM | #12 |
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Re: Merc crank clean out plugs
Just for info.... the 'cup-type' plugs that I have, came from Dorman. Available at my local parts store. Seems to me, they look same as original factory plugs. (for me, press in, no loctite. But, I see no reason that loctite would hurt.)
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11-09-2021, 04:45 PM | #13 |
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Re: Merc crank clean out plugs
Considering that Ford used the drive in plugs for millions of miles with no issues (known to me)
I chose to use the Dorman 555-010 plugs. No Loc-tite, drive in, 3-4 stake marks.
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