stripped out waterjacket plug...PMC
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=17071
Printed Date: September-27-2024 at 1:49pm
Topic: stripped out waterjacket plug...PMC
Posted By: woodyboard1
Subject: stripped out waterjacket plug...PMC
Date Posted: April-10-2010 at 2:56am
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every year it gets harder and harder to deal with the brass plugs on my engine block. I have a 1980 454 PMC. I just tried to get everything back together for the first trip to the lake and found out that one of the water jacket plugs threads is so rusted out that when I tried to screw the plug in it stripped out. I know I need to run a tap and die through it....my question is do I go one size up and also what about the metal fillings? My buddy said they would be flushed out the back with the exhaust...Any advise and tips on this would be really helpful. Also when I winterize do I take the plugs out...drain and put the plugs back in? Or do I leave the plugs out after I drain the block (it seems like this leaves water pooled on the threads....which causes the rust. HELP! we are getting very close to boarding season! ------------- work?.....let's go to the lake! |
Replies:
Posted By: JoeinNY
Date Posted: April-10-2010 at 3:33am
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With the pipe threads you may not need to go up a size, but I wouldn't count on it. I agree that you dont really need to worry about the chips. After you fix them I would say get yourself some plugs with removable handles and never remove them again
http://www.mcmaster.com/#stop-cocks/=6lecy9 ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: 8122pbrainard
Date Posted: April-10-2010 at 10:17am
Joe's link took me to the general selection page. These are the ones he's referring to: 
Joe also mentioned you may not need to go to the next pipe size. This is true if the threads aren't that bad. Try running the same size pipe tap in first but just a little deeper than the factory did. Since pipe threads are tapered, this will make the tapped hole slightly larger while cutting new threads. The danger here is if you have to go too far to clean up the threads then the hole will be too large and the plug/stop cock won't tighten. If that's the case, then yes the next step is going to the next pipe size. Your original plugs should be 1/4" pipe size. I also agree with Joe on the chips. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: WakeSlayer
Date Posted: April-10-2010 at 11:15am
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When winterizing, I think you should re-install the plugs after draining and fill the block with antifreeze, either by back-filling or pumping it in with the hose and bucket method. This method provides some anti-corrosion protection for the internals and will also keep your impeller pliable. ------------- Mike N 1968 Mustang |
Posted By: SNobsessed
Date Posted: April-10-2010 at 12:58pm
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A little anti-seize on the plug during re-installation goes a long ways for rust protection. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: eric lavine
Date Posted: April-10-2010 at 3:39pm
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at times, when the NPT taps are used, the tap is designed to go in half way and stop, but you can go further into the old threads farther with the tap, possibly cutting new threads, the plug will go deeper but, thats what i always try first, its worth a try
hand tight always on the new plugs, dont crank them. ------------- "the things you own will start to own you" |