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Old 07-26-2010, 08:21 pm   #1
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Just rebuilt my 327/300 in my '66 . The engine runs like a charm but....................it really overheats . After running for about 15 minutes it starts puking coolant . I've checked the timing , radiator ,water pump , hoses, coolant level . Also had the coolant checked for exhaust gases (came back positive , bummer) . Then did a leak down test (all looked good) and checked for bubbles in the coolant (didnt find any) . There isn't any oil and the water or water in the oil .
Where else should I look ? This is driving me nuts
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Old 07-27-2010, 07:31 am   #2
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HI there,

You might have a cracked cylinder head that only shows up when it gets hot.

Certainly have seen that more than once.

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Old 07-27-2010, 06:30 pm   #3
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Guess thats the next quest . Get the heads pressure tested . Anything else you can think of ?
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Old 07-27-2010, 07:19 pm   #4
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Exhaust gasses in the coolant usually points to a bad head gasket or a cracked cylinder head.
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Old 07-28-2010, 03:06 pm   #5
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I would have thought the leak down test would have shown a bad head gasket ? Now I'm worried about a crack some where .
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Old 07-30-2010, 09:00 pm   #6
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Hi there,

Sometimes the leakdown wont show on a cold engine.

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Old 04-17-2011, 12:57 pm   #7
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agree, a head gasket or cracked head that doesn t leak til its hot
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Old 04-18-2011, 09:02 am   #8
 
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there is a fluid you can put into the coolant that will change color if exhaust gas is present. if you bought a rebuilt water pump make sure it does not have a stamped steel impeller instead of the cast iron one. make sure you have a working vacuum advance. make sure the water pump is not a reverse rotation one
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Old 04-20-2011, 12:59 am   #9
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The testing fluid is whats giving the indication of exhaust gasses in the coolant . It turns from blue to yellow in about 10 minutes after the engine starts to heat up .
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Old 04-21-2011, 01:39 pm   #10
 
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Quote:
Originally Posted by 1Redctoo View Post
The testing fluid is whats giving the indication of exhaust gasses in the coolant . It turns from blue to yellow in about 10 minutes after the engine starts to heat up .
looks like you found the problem. after checking the head gasket seal i would have the heads magnafluxed and/or pressure tested.
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