Re: [Chrysler300] Re: Freeze out plug

["JoeyPilot" <Joeypilot@xxxxxxxxxxx>]

Keep in mind there are two types of these plugs. One is disc shaped; and one 
is a cup as described below by Ryan.


Joey
----- Original Message ----- 
From: "Ryan Hill" <ryan_hillc300@xxxxxxxxxxx>
To: <richard@xxxxxxxxxxxx>; "Chrysler 300" <chrysler300@xxxxxxxxxxxxxxx>
Sent: Monday, April 12, 2010 9:58 AM
Subject: RE: [Chrysler300] Re: Freeze out plug


>
> I'm not sure if I missed something here Richard but you describe placing 
> the frost plug with the curve facing outward. Please correct me if I'm 
> wrong but I've yet to ever see a plug placed in the hole backwards.
>
>
>
> All the plugs I've worked with were designed to be driven in with the 
> outer flange trailing and should appear concave (vs. convex) when 
> installed, this makes it more difficult for internal pressure to punch 
> them out. I've yet to have one fail, other than from corrosion, and never 
> use any type of adhesive. They should be driven in until the edge of the 
> flange is set about 1/8" beyond the block/head surface.
>
>
>
> I have always been of the understanding they were there for two reasons. 
> To empty the casting sand from the block when manufactured and then to 
> offer protection from frost damage in colder climates if the coolant were 
> to freeze. The plugs are designed to push out before the block or heads 
> crack. Something that might be more difficult if it were JB welded in. 
> (Fine if the car is always in a warm climate I suppose)
>
>
>
> Based on your description of the plug "fitting somewhat snug into the 
> machined hole", I would venture to guess the plugs you're using are too 
> small. They should not fit into the whole without being driven in.
>
>
>
> My experiences have all been with later B/RB engines ('64 up) and some 
> older Chev blocks so maybe I'm missing something inherent with the earlier 
> mopar heads? Perhaps getting the right size plug is the problem?
>
>
>
> Ryan Hill
>
>
>
>
>
> To: Chrysler300@xxxxxxxxxxxxxxx
> From: richard@xxxxxxxxxxxx
> Date: Mon, 12 Apr 2010 12:39:22 +0000
> Subject: [Chrysler300] Re: Freeze out plug
>
>
>
>
>
> Mark,
>
> I feel your pain. I struggled with these plugs in my G. This is bringing 
> back many bad memories.
>
> I believe these are called "welsh plugs". I cannot remember the size. I 
> mic'd the ID of the hole and then matched as closely as possible, seems 
> there are even metric sizes if I remember correctly.
>
> These are concave shaped stamped metal, they fit somewhat snug into into 
> the machined hole within the head (or engine block) with the curve facing 
> OUTWARD of the engine. With a blunt device (I used a 1/2" drive socket 
> extension), you whack the heck out of it to make it expand and create a 
> tighter friction fit to the machined surface.
>
> Here are my opinions and methods which have lasted for almost 10,000 miles 
> which included a trip through the 113F dessert in Arizona:
>
> -Clean the machined surface, I used lacquer thinner.
> -Find a plug which is the tightest possible when pushed in by hand.
> -coat the edges of the plug and head/block with JB Weld, then insert plug.
> -Smack the heck out of the plug with something that is a little smaller 
> than the diameter of the plug. I recommend smacking as infrequently as 
> possible, I think once is ideal, but not always practical.
> -Let it sit for a few days to allow the JB Weld to firm.
>
> I do not claim to have eliminated this possibility. I still carry the 
> rubber temporary expansion plugs as a precaution.
>
> Hope this helps, good luck!
>
> Richard Osborne
>
> --- In Chrysler300@xxxxxxxxxxxxxxx, Mark Souders <MRS954@...> wrote:
>>
>>
>> This morning I was driving my 300H and three miles from the house, I 
>> pulled out from a traffic light, and something went POP. Then there was a 
>> white cloud of smoke coming from under the car. I pulled off the highway, 
>> opened the hood and found that a freeze out plug removed itself from the 
>> left head. With the help of a few gallons of water, I nursed it back 
>> home. Now I need to know what size plug goes into that hole, what kind to 
>> get, and how do I install it so that it won't escape again? The FSM is 
>> very evasive about this subject. This plug has been in the head for 8 
>> years and 13,000 miles, not rusted out, the whole plug is gone, and the 
>> paint is chipped off the upper control arm. I'm glad it didn't happen a 
>> few hundred miles earlier, when I was in Myrtle Beach!
>>
>> Thanks for the help,
>>
>> Mark Souders
>> 300H
>> Mohrsville, PA
>>
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>
>
>
>
>
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