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Discussion Topic:
looking for cause of overheating 34
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TomO |
07-25-2014 @ 7:28 AM
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Senior
Posts: 7243
Joined: Oct 2009
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I would remove the water pump belt and redo the bubble test. The bubbles could be normal. Are you using water, Prestone or Sierra. If you still have bubbles, do the compression check or drain the radiator, remove the upper hoses, fill the block with water until it is visible in the pump outlets and repeat the test to determine which side is failing.
Tom
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supereal |
07-24-2014 @ 2:32 PM
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Senior
Posts: 6819
Joined: Oct 2009
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I'd run the compression check before pulling the heads to narrow down which side is probably involved. I doubt that a cracked block is the cause if the problem just began, unless the engine was highly overheated recently. Before you reinstall the head(s), have them checked and resurfaced. Head gasket failure is mostly due to warping of the head. Look for cracks in the vicinity of the exhaust valve seats. That is the usual place to find them. I suggest that you put in a bottle of Barr's Leaks when you have the engine back together as a precaution. Let us know what you find.
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carguy |
07-24-2014 @ 1:38 PM
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New Member
Posts: 167
Joined: Oct 2009
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Thanks Supereal. I'm suspecting head gasket(s). Checking temperatures at the radiator hoses and across the radiator everything seems reasonable but at a fast idle the coolant level continues to increase even after the temperature seems stabilized with no, or only occasional, bubbling. But when I increase the rpm's I see significant bubbling when looking down into the radiator and the coolant is running out of the overflow tube quite a bit. So, Head gaskets right? Or possibly a cracked block? I'm assuming the thing to do is to pull both heads, see what there is to see and go from there? Comments appreciated.
Bill Brown '34 Cabriolet
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supereal |
07-22-2014 @ 2:02 PM
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Senior
Posts: 6819
Joined: Oct 2009
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There are lots of possibilities. Did your car always run hot? Coolant topped off in the radiator? Belt driving the pumps properly tensioned? If these are OK, it boils down (my pun) to a partially plugged radiator, or combustion leak at one of the head gaskets. Fill the radiator to the top of the tube, start the engine, and watch for bubbles. If they appear, a head gasket is bad. If not, be sure the thermostats, if you run them, are in place and open fully when tested in a pan of water on the stove. Are any of the brakes stuck and not retracting when the pedal is released? If you pass all of these, a new radiator is the probably cure.
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carguy |
07-22-2014 @ 1:41 PM
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New Member
Posts: 167
Joined: Oct 2009
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I recently took my '34 out for a little drive around town and surprised when I found it was boiling over. Not sure if it is a radiator or engine problem. Any suggestions to help determine which is the likely problem area will be appreciated.
Bill Brown '34 Cabriolet
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