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What to use to seal crankcase plugs..

I pulled a few of the larger plugs on my 3.6 block to make sure the main oil galley was clean. I turned out to be a waste of time but that's ok at least I know that now.

Now I need to put the plugs back in. I have the replacement Aluminium plugs. The shop manual says to "Apply Optimoly HT (copper paste) to plug and press plug in flush". Is this the preferred method or is there any other methods, for instance using some of the case sealer?

Any help is appreciated, I would rather this did not leak. ;-)

Cheers,

Mike
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Old 02-07-2006, 07:35 AM
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I just did this too. I put a thin coat of the loctite case sealant on the plug, tapped it in, ground off the external face clean, washed with MEK, and put a thick coat of JB weld over the plugs.
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Old 02-07-2006, 08:28 AM
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I was thinking about the JB Weld as well...I guess it can't hurt!

Thanks,

Mike
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Old 02-07-2006, 08:56 AM
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Third vote for JB weld.

AFJ
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Old 02-07-2006, 05:14 PM
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How about tapping the galleys and plugging them with aeroquip AN/NPT aluminum plugs? I did this on my 914 and just loctited them in. I don't quite trust using a factory plug once the original has been removed.
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Old 02-07-2006, 06:07 PM
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Charles has the right idea. Tap the holes and use pipe plugs. It's what we do and we have never experienced ant problems.
This allows for easy cleaning during future rebuilds [specially for race engines]
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Old 02-09-2006, 03:54 AM
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I will see what kind of plugs I can get at that size. I know they can't go too deep, there seems to be a ridge machined into the hole to hold the backside of the plug.

Good ideal though. I am going to use plugs to clean the tubs in the cam towers so why not the big ones in the block?

Thanks!

Mike
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Old 02-09-2006, 07:16 AM
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Quote:
Originally posted by Henry Schmidt
Charles has the right idea. Tap the holes and use pipe plugs. It's what we do and we have never experienced ant problems.
This allows for easy cleaning during future rebuilds [specially for race engines]
Any idea of the size that you use? And do you have a special tap or just use a normal tap? I mean you don't want to go too deep...

I am ready to do this so tomorrow I will look around for some plugs.


Cheers,

Mike
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Old 02-12-2006, 11:20 PM
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Use only liquid teflon on the threads, do not use teflon tape.
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Old 02-13-2006, 04:37 AM
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OK I was going to use either red locktite or case sealer on the threads.

What size plug did you use? The SAI plugs appear to be either too small (1/2") or too large (3/4"). If its a metric plug then it likely 24mm since the hold is 22mm and needs threads cut.

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Mike
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Last edited by Mike Juzenas; 02-13-2006 at 10:39 AM..
Old 02-13-2006, 07:32 AM
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Another vote for JB weld on the outer surface, it is very close to factory specification. Not to mention it is recommended in Wayne's book as well. I just completed my case sealing as well.

Good luck,

Alex
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Old 02-13-2006, 09:33 PM
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Bringing back an old thread...

For the case plugs, do you guys just use a wire brush like Wayne suggests, or do you sand over the plug to give the jb weld something to bite into...?

If you use a wire wheel, it turns the metal shiny...not sure jb weld will stick...

Can't say I have seen ANY threads about these leaking. On my car, most of the original epoxy was long gone... Can't say it was leaking...
Old 09-23-2017, 03:33 PM
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Wire brush and acetone will work.
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Old 09-24-2017, 03:35 PM
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Will do...
Old 09-24-2017, 05:46 PM
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