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Old 09-30-2002, 10:03 PM
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Post blown freeze plug

I have a model A with a 460 engine and have blown 2 freeze plugs, Anyone have any idea why? The radiator does not over heat..never heard of this problem. This is my 3 rod I've built

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Old 10-01-2002, 02:59 AM
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Are you sure they were the correct size and installed correctly? Just having one 1/64th off will cause this.
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Old 10-01-2002, 05:45 AM
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If the plugs are, for sure, the correct size, what type of water pump are you using.

Several years ago I had to install a rubber expansion plug to eliminate this type of problem.
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Old 10-01-2002, 02:18 PM
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I had this problem once. It was cause by me not installing them properly. How are you installing them?
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Old 10-01-2002, 02:58 PM
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It's possible that your expansion plug bore is corroded and now oversize which leads to a poor fit in the bore. Using any number of methods to repair it is possible, I use a devcon epoxy for problems like this and actually glue them into place. A light bead blasting of the OD of the plug and a good cleaning of the bore surfaces will ensure good adhesion. I have seen this many times and if it isn't corrosion causing the problem it can be traced to silicone sealant being used to seal the plug and ease installation. Silicone is slippery and makes the plug slide out easily. Non hardening gasket sealant is what I use for all frost plugs installations.
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Old 10-01-2002, 04:13 PM
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are you using brass plugs?
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Old 10-02-2002, 07:55 AM
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As Jaw stated, the condition of the hole in the case is very important. Make sure there is no rust or scale in the hole and also clean the sides of the expansion plug thoroughly. Make sure that you are using the correct plug for your application. Ford specifies a DEEP cup plug, with a height of .325" and a diameter of 1.507" (one of the few, if any expansion plugs that are spec'd. to three decimals!). Using the correct tool is important too. A cup type expansion plug should be driven in by pressure exerted on the inside of the cup, not by hammering on the edges - for obvious reasons. OK, I know, a lot of guys use a large socket and an extension to drive in the plugs, but . . . It is generally recommended that cup type plugs be installed with only a light coat of oil on the plug and the hole. But this is the real world and I too have used some "goo" to seal them. Good luck.
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Old 10-02-2002, 01:12 PM
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The freeze plug installation tool I have drive the plugs from the outer edge
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Old 10-07-2002, 08:51 PM
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Thanks to all..I got a slightly larger freeze plug and used epoxy...so far it's holding!!
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