freeze plugs??
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The local parts store will try to sell you 1-3/4" plugs but they are really 1-49/64" Get brass, not steel. Clean the sealing surface of the block with scotch brite or crocus cloth and put a lap of Aviation Permatex on the sealing surface of the freeze plug to aid in installation and sealing.
Dorman brass freeze plug # 565-036
Dorman brass freeze plug # 565-036
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Had a freeze plug leaking on my '72 390. Bit the bullet, pulled the engine. Found a cracked flywheel so while I was changing ALL the freeze plugs, I changed the flywheel and the oil pump, water pump, oil pan gasket, fuel pump, and front trans seal. AND then found a cracked exhaust manifold so changed BOTH of them.
It's amazing how one little job turns into one not-so-little job.
It's amazing how one little job turns into one not-so-little job.
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One thing to remember about leaking freeze plugs: Usually, the reason one leaks is because it's a steel plug and it has rusted out from the inside. That's usually caused by previous owners filling it with straight water or not enough anti-freeze. Aside from rust, freeze plugs are usually trouble free for the working life of the engine. Sometimes one will come loose or pop out for no apparent reason, but that's rare.
What this means is that if one plug is leaking from a pinhole from rusting through, then the other plugs are probably rusted too. That one just went through first. When you pull out the leaking one, if it's obvious that it has rusted through, then you might as well replace all the others at the same time. Or you'll be looking at water puddles again soon. Like Bobby said, if you're going to do the job, get brass plugs of the correct size.
What this means is that if one plug is leaking from a pinhole from rusting through, then the other plugs are probably rusted too. That one just went through first. When you pull out the leaking one, if it's obvious that it has rusted through, then you might as well replace all the others at the same time. Or you'll be looking at water puddles again soon. Like Bobby said, if you're going to do the job, get brass plugs of the correct size.
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