Keeps popping freeze plugs on the dyno... - Page 2 - Vintage Mustang Forums
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post #16 of 36 (permalink) Old 04-25-2019, 08:43 PM Thread Starter
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I agree that it's a physical problem between the freeze plug and block. Do you guys think my solid motor mounts are making my block flex instead of rotating normally like it would with rubber mounts, and the flex allows the plugs to pop out? I also made the error of using a rubber transmission mount with the solid engine mounts, could the give back there be exacerbating the flex in the block? I have a poly trans mount but I didn't figure it would be big enough of a problem that I had to get to it immediately.

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post #17 of 36 (permalink) Old 04-25-2019, 09:01 PM
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Buy the tester that indicated presence of hydrocarbons in coolant. If there is a positive test, then head gasket problem or crack in block between cylinder and water jacket. I don't think water pump should matter unless the plugs are put in wrong. Don't think that under 350hp really is going to stress the block enough to cause problems. I have seen some turbo/superchargers put a lot HP without problems. Do make sure your rad cap is good but if engine is showing no signs of overheating the pressure would have to be from another source (crack block/head gasket). I hope the plugs were just put in bad.
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post #18 of 36 (permalink) Old 04-25-2019, 09:17 PM
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No history, the block, crank and rods were supplied by the builder. I'd give them a call but I bought this thing six years ago, I doubt they care.
This is why I baulk at buying a pre-assembled shortblock or crate motor.

So lets say they screwed up... so what are they going to do now? You’ve already done the work of pulling it apart, and finding the problem they caused. It’s not like you can bill them, and they’ll pay you for the time.

Stories like this just make me lean towards Dad, and I getting the parts, and spending the day putting an engine together like we did back when we were drag racing.

Those were great times.
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post #19 of 36 (permalink) Old 04-25-2019, 09:36 PM
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Quote:
Originally Posted by jdub View Post
I agree that it's a physical problem between the freeze plug and block. Do you guys think my solid motor mounts are making my block flex instead of rotating normally like it would with rubber mounts, and the flex allows the plugs to pop out? I also made the error of using a rubber transmission mount with the solid engine mounts, could the give back there be exacerbating the flex in the block? I have a poly trans mount but I didn't figure it would be big enough of a problem that I had to get to it immediately.
I don't think that has anything to do with it.
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post #20 of 36 (permalink) Old 04-25-2019, 09:47 PM
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May have been a batch of bad offshore freeze plugs. As long as everything else checks out replace them and enjoy the power!
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post #21 of 36 (permalink) Old 04-25-2019, 09:49 PM
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I don't think that has anything to do with it.
I agree... just too far fetched.

If that were the case you’d have bigger concerns.
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post #22 of 36 (permalink) Old 04-26-2019, 05:26 AM
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I would put a pressure gauge on the cooling system as a first step. That would remove a lot of guesswork. Are the pressure normal or do it act strange? Do it rise, but only if you really push the engine?
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post #23 of 36 (permalink) Old 04-26-2019, 07:12 AM
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Whatever the cause, I would definitely replace all of them. I can't stand driving a car I don't trust to get me home !

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post #24 of 36 (permalink) Old 08-11-2019, 10:22 PM
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So what was the final conclusion to this?

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post #25 of 36 (permalink) Old 08-11-2019, 10:35 PM
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Any chance the thermostat is in backwards?

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post #26 of 36 (permalink) Old 08-12-2019, 01:23 PM Thread Starter
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All plugs got replaced. No issues since. Never made more than 324rwhp.

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post #27 of 36 (permalink) Old 08-12-2019, 02:25 PM
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jdub,

TRE is not a fly by might engine builder. They have a very good name and build a quality product. It is worth an email or call to Paul just to see if he has any insight about the problem. If this is a 5.0 roller block , there could be other problems causing this . Nascar teams used to "pin" the freeze plugs in the block by drilling small holes for rivets to keep the plugs in place. I like using the Ford racing screw in plugs and have the taps to do it myself. We don't get freezing cold weather in California so I'm OK doing it.
Despite being six years old , I'm sure Paul will help you to figure this out.
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post #28 of 36 (permalink) Old 08-12-2019, 03:03 PM
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jdub,

TRE is not a fly by might engine builder. They have a very good name and build a quality product. It is worth an email or call to Paul just to see if he has any insight about the problem. If this is a 5.0 roller block , there could be other problems causing this . Nascar teams used to "pin" the freeze plugs in the block by drilling small holes for rivets to keep the plugs in place. I like using the Ford racing screw in plugs and have the taps to do it myself. We don't get freezing cold weather in California so I'm OK doing it.
Despite being six years old , I'm sure Paul will help you to figure this out.
Randy

I'd like to know more about this tap- where can you get them or at least the diameter and thread pitch. I think that would be a cool add if I my engine ever comes out.

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post #29 of 36 (permalink) Old 08-12-2019, 03:28 PM Thread Starter
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TRE is not a fly by might engine builder. They have a very good name and build a quality product. It is worth an email or call to Paul just to see if he has any insight about the problem. If this is a 5.0 roller block , there could be other problems causing this . Nascar teams used to "pin" the freeze plugs in the block by drilling small holes for rivets to keep the plugs in place. I like using the Ford racing screw in plugs and have the taps to do it myself. We don't get freezing cold weather in California so I'm OK doing it. Despite being six years old , I'm sure Paul will help you to figure this out.
"I spent $1000 having the freeze plugs of an engine I bought from you six years ago for $1300 replaced because three of them fell out on the dyno?" How exactly do you think that conversation will go? I just don't see a good ending that is worth my time. Do you know him personally?

I have actually not read one other good thing about them on the internet other than what you wrote.

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Last edited by jdub; 08-12-2019 at 03:33 PM.
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post #30 of 36 (permalink) Old 08-12-2019, 04:14 PM
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I'd like to know more about this tap- where can you get them or at least the diameter and thread pitch. I think that would be a cool add if I my engine ever comes out.
1-1/2 NPT . For a 289-351 you need 2 taps. One "regular" and one shortened by 3/4ths of an inch to "deepen" the threads so the plug will be flush with the block. The "regular" tap hits the cylinder walls before the tapped hole is large enough.
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