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Elite Veteran
Posts: 688
Location: Winston Salem, N.C. | hi
I have a 1958 Plymouth 318 installed in my 56 Plymouth wagon. Engine is overheating at highway speeds, not at lower speeds. The following are new: radiator, hoses, water pump.
What do you think could be the cause and what would be the remedy? If you think it most likely is a blockage in the engine, how can that be checked out and remedied?
Thank you for your time and help. I am attaching a couple pix of the car.
sincerely
Jerry Whitfield
(IMG_1890 rear xxx small.jpg)
(1956 plymouth xxxsmall xxx small.jpg)
Attachments ---------------- IMG_1890 rear xxx small.jpg (103KB - 121 downloads) 1956 plymouth xxxsmall xxx small.jpg (184KB - 124 downloads)
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Expert
Posts: 4034
Location: Connecticut | Jerry -
A malfunctioning thermostat could cause that. If you replace, be sure to use a 180. Also check the exhaust manifold heat riser. If it's stuck in the closed position, or if the thermostatic spring is missing, then you have a problem. Also check the timing.
Ron |
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | Yeah, not an internal issue. I'd be looking at a collapsing radiator hose. |
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Expert 5K+
Posts: 8947
Location: WHEELING,WV.>>>HOME OF WWVA | is it a new overheating issue or old one ----------------------------------------------later |
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Elite Veteran
Posts: 688
Location: Winston Salem, N.C. | hi
car came with no engine, restoration finished, wanting to put car in regular use and this problem showed up. I don't know if it was a problem for prior owner of the engine I purchased or not. So, all I can say is that it is new to me.
thank you |
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Extreme Veteran
Posts: 406
Location: Hilltown, PA |
I know this sounds stupid, but I have seen it several times and it will cause your exact symptom . . .
Is the fan installed correctly, as in not backwards?
If installed backwards the fan will still cool the engine at idle and low speeds by pushing air OUT through the radiator. At highway speeds this creates a "stall" condition where the airflow out of the radiator created by the fan is cancelled by the forward motion airflow into the radiator - no airflow = overheat.
Gregg |
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