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Regular
Posts: 80
Location: ca. bay area | I just started to break in my rebuilt 361 engine on my 61 and popped a freeze plug on the passenger side of the engine under the exhaust manifold. I replaced my radiator cap after the break in then it happened. my question is the cap not supposed to be 15 pound release pressure and if so where do I find the correct one. should I replace the freeze plug or just try to tap it back in? is there a sealer I use also on the plug?...Ive read the other freeze plug problem thread...thanks
Edited by shkfab1 2006-11-26 6:54 PM
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Expert
Posts: 1506
 
Location: Colo Spgs | Doug
Do not worry about re-installing one plug, It is a indication of what may be coming soon. Go to NAPA and get a complete set ( if the right shoe lace broke would you replace both or just the broken one ).
Rodger & Gabby
COS |
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Expert
Posts: 4533
Location: Ripon, WI | Are you sure you tapped them in enough?? |
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Expert
Posts: 1506
Location: Colo Spgs | Hola
Thanks to Mike, I re-read the original post about the one freeze plug. Go get another one and chuck the one that is loose.
Rodger & Gabby
COS |
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Regular
Posts: 80
Location: ca. bay area | I had the engine rebuilt by a machine shop all new everything...Im going to replace the plug today hope thats the only one that goes...I also replaced the radiator cap w/ a 7 pounder... |
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Regular
Posts: 80
Location: ca. bay area | replaced the bad freeze pug on the head and the one next to it blew out,I guess I will replace them all.... |
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Expert ,, George Passed away July 28th 2021, He will be Missed
Posts: 1295
Location: Twin Falls, Idaho | Don't just replace them.... replace them with the stainless ones from http://www.hothemiheads.com/
The have a center that tightens up with an allen wrench and they WILL NOT come out unless you take them out. You can ruin an engine if they come out at the wrong time and place. My experience is similar to the fellow above.... if one comes out, then that one or others are likely to come out again sometime in the future and always at the most inconvenient time. After losing two at different times, I put the ones from Hot Heads in and now have over 14,000 (mostly highway, high speed) miles on the engine and no problems whatsoever.
Good luck.
George
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Expert ,, George Passed away July 28th 2021, He will be Missed
Posts: 1295
Location: Twin Falls, Idaho | I meant to mention I am running a/c and a 16 lb radiator cap and the engine is a 392 hemi with 2 four barrels. |
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Expert 5K+
Posts: 5139
Location: cornpatch county, Southwest IOA | Thanks George, I was wanting an endorsement on those stainless freezeplugs befor I laid out that kind of cash for them. Another thing to put on my wintertime "to-do" list.........................................5%................ |
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Member
Posts: 12
Location: Windom, MN | I also like the brass freeze plugs. also, coat the opening and the edges of the plug with permatex thread sealant/pipe dope. it will be black or dark brown color and contains NO teflon. I've had excellent luck with this sealant no matter what the freeze plug material. Later, Tony |
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Expert 5K+
Posts: 5139
Location: cornpatch county, Southwest IOA | Tony B. - 2007-01-12 10:21 PM
I also like the brass freeze plugs. also, coat the opening and the edges of the plug with permatex thread sealant/pipe dope. it will be black or dark brown color and contains NO teflon. I've had excellent luck with this sealant no matter what the freeze plug material. Later, Tony
Tony -did you have any problem getting the brass plugs to tighten up ( assuming they were the expansion-nut type) I tried those and following the directions- could not get the first one to tighten up so did not try the rest- returned them for credit...................................5%....................... |
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Regular
Posts: 80
Location: ca. bay area | thanks for the information, I have replaced them all but I didnt know about this type. If they pop again I will sending away for the S.S. plugs. I had not had a chance to run it very long ,heck it hasnt been out of the driveway yet. I had to rebuild the carb but I have not installed it yet...Thanks again I will let you know what happens...thanks.... |
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Extreme Veteran
Posts: 397
Location: McHenry Illinois | chrysler300c - 2006-12-28 12:37 AM
Don't just replace them.... replace them with the stainless ones from http://www.hothemiheads.com/
The have a center that tightens up with an allen wrench and they WILL NOT come out unless you take them out. You can ruin an engine if they come out at the wrong time and place. My experience is similar to the fellow above.... if one comes out, then that one or others are likely to come out again sometime in the future and always at the most inconvenient time. After losing two at different times, I put the ones from Hot Heads in and now have over 14,000 (mostly highway, high speed ) miles on the engine and no problems whatsoever.
Good luck.
George
THESE?
Milled Stainless Steel Freeze Plugs 241 / 270 - Dodge
The ultimate freeze plugs. These milled stainless steel plugs lock in place with a mechanical locking "T" bar and are O-ringed to prevent leakage. These plugs will not pop out under pressure. A must for racing and supercharged applications, they also provide an added measure of assurance on your street engine.
For stepped freeze plug holes.
P/N 21040 Stainless Steel Freeze Plugs 241 / 270 $ 71.95
Dave W.
 (21040.jpg)
Attachments
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 21040.jpg (12KB - 259 downloads)
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Member
Posts: 44
| If you're buying the stainless plugs for a 331 be sure to check for fit before installing them.
Sometimes Chrysler doesn't machine the hole into the block and they bottom out before the O-ring seals.
Hot heads are aware of this issue but they still don't state it on their order page.
When I called them to discuss this, they didn't even offer any type of refund...
I'm NOT happy with them!
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Expert 5K+
Posts: 9647
Location: So. Cal | What year of 331 are you talking about? I used them on my '55 331 and didn't have any trouble. One of them leaked slightly at first, but after using RTV with it, it was fine. I didn't notice any of them that were too shallow for the o-ring. If you would like to sell your set, I would consider purchasing them from you. |
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Member
Posts: 44
| Mine is also a 55 331.
There shouldnt be a need for any RTV on this plug design.
You may have the same issue.
I've modified the plugs they way they should have been done in the first place and re-installing them. |
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freeze plug problem
