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03-16-2022, 07:14 PM | #1 |
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Removing cleanout plugs-Merc Crank
I imagine this is one of those "Ya just gotta do what ya gotta do" things, but what might be the best approach to remove these plugs?
I will mention that I thought I could drill a hole, thread in a screw, and use my small slide hammer,... not so good. Ready to hear what many of you guys have done. Thanks.
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03-16-2022, 07:57 PM | #2 |
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Re: Removing cleanout plugs-Merc Crank
Hi Shoebox.. those cleanout plugs just screw in and out. They have a hex head for a spanner. I found there was nothing to be gained by taking them out. Just the experience.
Regards Kevin |
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03-16-2022, 08:07 PM | #3 |
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Re: Removing cleanout plugs-Merc Crank
All I ever did on the press in plugs is use a 1/4 inch dia lag bolt of suitable length and pry the plug out.
If necessary go to next bigger dia lag.
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03-16-2022, 08:13 PM | #4 |
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Re: Removing cleanout plugs-Merc Crank
Never seen a screw in plug. All the ones I’ve ever removed were press in. Lag screw and a slide hammer works well. If you do not remove them and clean all the old sludge and debris out of the journal’s your just asking for failure.
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03-16-2022, 08:14 PM | #5 |
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Re: Removing cleanout plugs-Merc Crank
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03-16-2022, 09:02 PM | #6 | |
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Re: Removing cleanout plugs-Merc Crank
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Quote:
Nope, not these. These are pressed in plugs, (Dorman makes replacements) I have read commentaries just tonight in the V8 Archives about this procedure, various approaches of how to do. I'd like to spare my machine shop this time if I can. Thanks.
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03-16-2022, 09:03 PM | #7 |
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Re: Removing cleanout plugs-Merc Crank
I've only pulled the plugs out of my C59A crank. I wonder if the Canadian ones are different. It's possible that some previous owner may have installed the threaded bungs as the crank had been ground before.
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03-16-2022, 09:19 PM | #8 |
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Re: Removing cleanout plugs-Merc Crank
Notice that the poster said he "found there was nothing to be gained by taking them out". I take that to mean the the crank was clean inside with no sludge. I also take it to mean that someone had been in there before.
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03-16-2022, 09:49 PM | #9 |
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Re: Removing cleanout plugs-Merc Crank
All the 'chips' and debris from machining will also be in 'there'. Balance crank after cleaning and replacement. Newc
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03-16-2022, 10:08 PM | #10 |
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Re: Removing cleanout plugs-Merc Crank
The Merc plugs from Dorman 555-010 CUP 5/8.
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03-16-2022, 10:29 PM | #11 |
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Re: Removing cleanout plugs-Merc Crank
I believe the difference is Canadian Vs American.
The ones I've seen in Canada used screw in plugs. As for there being no advantage to removing them, mine were plugged with sludge. Kirk
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03-17-2022, 03:34 AM | #12 |
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Re: Removing cleanout plugs-Merc Crank
This is what I found in a nice and outside clean crank from a french flatty running a filter system and having done around 900 hours since overhaul. So whenever you take an engine apart you should look into the crank, will save a lot of grief in the long run.
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03-17-2022, 03:39 AM | #13 |
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Re: Removing cleanout plugs-Merc Crank
I have only removed them once. I drilled a small hole, put a self tapper in and pulled them out. I reused them by gas welding the hole up, refitting and re-staking the edge of the hole.
As they are available and the part number is shown above it would make sense to get new ones. I didn't know they were available when I did mine. |
03-17-2022, 06:14 AM | #14 |
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Re: Removing cleanout plugs-Merc Crank
Tap the inside of the cup to 14mm. Use slide hammer with 14mm stud. Can even reuse old plugs if necessary.
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03-17-2022, 08:05 AM | #15 |
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Re: Removing cleanout plugs-Merc Crank
I just use a slide hammer. Then (on my racing cranks) I have the machine shop tap them for screw-in plugs and away we go (obviously this is prior to a crank regrind and rebalance).
Last edited by Bored&Stroked; 03-18-2022 at 06:33 AM. |
03-17-2022, 08:09 AM | #16 |
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Re: Removing cleanout plugs-Merc Crank
Note, if you're using the stock soft plugs (noted up above), then make sure you "peen" a couple spots around the edges of the holes in the crank journals after installation - to keep them from potentially blowing out.
This is particularly true when you're running a late 49-53 oil-pump with its higher-pressure relief valve. If you blow a plug out, then you'll have no oil pressure and then you'll soon have no bearings. I blew a soft plug out on my very first racing flathead - luckily, I shut the engine down to figure out what the heck caused the sudden major loss of pressure. I was 15 years old, glad I had enough sense to know something was majorly wrong and not just run it! Didn't hurt the bearings - thank God! |
03-17-2022, 12:18 PM | #17 |
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Re: Removing cleanout plugs-Merc Crank
I just pulled a set today. Drilled and tapped 1/4"-20, used a longish bolt and a suitable socket as a spacer. Just wound the bolt in and it pulled the plugs out. It worked really well and guess what - I have it on video.
I have new ones ordered but if I was to weld up the holes I could reuse the originals. FWIW I did pull some sludge out of the holes. |
03-17-2022, 12:55 PM | #18 |
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Re: Removing cleanout plugs-Merc Crank
I'd be leary about reusing the plugs as they are bound to distort when initially installed. New ones are cheap.
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03-17-2022, 07:05 PM | #19 | |
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Re: Removing cleanout plugs-Merc Crank
Quote:
Mart, Could you put up a link to the above video? Thanks!
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03-17-2022, 07:51 PM | #20 |
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Re: Removing cleanout plugs-Merc Crank
It doesn't exist yet, all I have is raw footage. It will go out in order with the rest of the engine build series.
I can attach some snips here though, but will have to do it later as I have something else I need to do first. Mart. |
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