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Possible blockage in 318" engine ?
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jerrybev
Posted 2019-06-19 3:35 PM (#583729)
Subject: Possible blockage in 318" engine ?


Extreme Veteran

Posts: 477
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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
----------------
Attachments IMG_1890 rear xxx small.jpg (103KB - 28 downloads)
Attachments 1956 plymouth xxxsmall xxx small.jpg (184KB - 29 downloads)
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ronbo97
Posted 2019-06-19 4:51 PM (#583732 - in reply to #583729)
Subject: Re: Possible blockage in 318" engine ?


Expert

Posts: 3349
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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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wayfarer
Posted 2019-06-20 12:15 PM (#583776 - in reply to #583729)
Subject: Re: Possible blockage in 318" engine ?



Elite Veteran

Posts: 804
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Location: Central Ory-Gun
Yeah, not an internal issue. I'd be looking at a collapsing radiator hose.
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60 dart
Posted 2019-06-20 5:07 PM (#583803 - in reply to #583729)
Subject: Re: Possible blockage in 318" engine ?



Expert 5K+

Posts: 8555
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Location: WHEELING,WV.>>>HOME OF WWVA
is it a new overheating issue or old one ----------------------------------------------later
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jerrybev
Posted 2019-06-21 9:25 PM (#583853 - in reply to #583803)
Subject: Re: Possible blockage in 318" engine ?


Extreme Veteran

Posts: 477
100100100100252525
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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LostDeere59
Posted 2019-06-27 4:33 PM (#584138 - in reply to #583853)
Subject: Re: Possible blockage in 318" engine ?



Extreme Veteran

Posts: 337
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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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