Bob Wanta wrote:
>
> Hi Scott,
> Freeze out plugs (core plugs) are steel cup shaped plugs. If the
> coolant ever freezes to ice they are designed to pop out relieving the
> pressure on the block so it doesn't crack.
> There are 1 or 2 in the back of the head and 1 just below the head in
> the back of the block, 4 more along the exhaust side of the block behind the
> heater bypass tube, 1 by the distributor, 1 by the alternator, and 2 under
> the front plate near the water pump.
> After so many years they rust or corrode (due to reactions with old
> antifreeze) and start to leak.
> I haven't seen any type of sealant that will stop the leak once it
> starts because of the cooling system pressure.
> You should be able to buy a full set of plugs (individually at a Napa
> store etc.) for under $10.
> You normally drill a small hole in them, attach a slide hammer, and yank
> to get them out.
>
> You assumed correctly as to filling the engine. Also, as you drive the
> coolant will still leak causing the air bubble - so don't go any farther
> than it takes to lose 2 qts of coolant, maximum.
>
> Good luck - Bob
>
> Bob:
Thanks for the clarification. Will try some Bars Leaks, a cooling
system lubricant and leak sealer (highly recommended to lubricate
water pump and will seal leaks) as a temporary "fix". Will assess
best way to approach repair for the permanent fix.
Again, thanks for the info.
Scott Suhring
Elizabethtown, PA
'70 TR6
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