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best sealant option for freeze plugs?
02-23-2006, 07:24 PM
Post: #11
 
With brass plugs I never use anything, but with steel plugs I use RTV.




Kevin
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02-23-2006, 07:36 PM
Post: #12
 
use RTV and let it setup for 48 hours.

on a street truck you don't really need if BUT offroad if you don't put it they can vibrate out.
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02-23-2006, 07:41 PM
Post: #13
 
Boss...on my jasper engine when one of the freeze plugs popped on me, Jasper told me to use a certain # of Locktite. I can remember the number. but It had to set for 8 hrs then i pressure tested....It lasted at least 25k miles then and someone else is now driving it.

I'd check into that if I were you!!! I definitly recommend using sealant...

Rick




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02-28-2006, 02:21 PM
Post: #14
 
I always use Permatex Gasket Maker...the black sticky stuff in a tube (looks like tar), not RTV. Coat the entire inner face of the plug with it. Most plugs I have taken out were rotten in the center for some reason...maybe the block acts as an anode??

If you use brass, I doubt sealant is needed. Steel, I think the idea is to prevent them from rusting out.

And how does a freeze plug vibrate out?!?!? Loser

My only advise is don't punch them in too far.

And if you are worried about them "vibrating out", you can drill and tap the block for small screws and add a piece of strap steel across them to prevent them blowing out under high RPMs. Brass plugs are nice because they are corrosion resistant, but they are also softer, don't hold in the block as well, and can pop out...although I have only seen this once at a drag strip.

steved




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03-01-2006, 10:30 AM
Post: #15
 
Quote:On 2006-02-23 16:57, outalne94z71 wrote:
freeze plugs are self sealing brass, if you put sealant on them they may not pop out when they are supposed to, but then what are the chances that it would ever get cold enough by you for that
Freeze plugs arent supposed to pop out when it gets too cold so your block wont crack. Freeze plugs are there for inital casting purposes only from the factory.




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03-01-2006, 10:39 AM
Post: #16
 
Quote:On 2006-02-28 13:21, steved wrote:

If you use brass, I doubt sealant is needed. Steel, I think the idea is to prevent them from rusting out.

And how does a freeze plug vibrate out?!?!? Loser

Brass plugs are nice because they are corrosion resistant, but they are also softer, don't hold in the block as well, and can pop out...although I have only seen this once at a drag strip.

steved

I am With Stupid

The only time I've ever seen a pressed-in freeze plug (brass or steel) "pop" out due to engine load/vibration was at a drag race. 550+ horsepower and 7000+ rpm in a late model, thin casting 5.0/302 Ford block is living on the ragged edge. This guy puked a freeze plug out of the block (probably due to the block twisting) out at about the 1/8th mile, in the finals.

I have always run brass plugs and never used any sealant. The way I look at it, more likely than not, if I ever have to worry about a brass plug failing, the motor's probably given up the ghost long before that, or I've got some big time problems above and beyond a freeze plug.




Zac

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