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03-02-2015, 01:28 PM | #1 |
Junior Member
Join Date: Apr 2012
Location: Riverton, Utah
Posts: 12
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1934 Pickup overheating issues
Hello all, I could use your help. I wrapped up the restoration on a 34 pickup a little over a year ago. The owner participated in a couple parades last summer, and each time the engine overheated and coolant boiled over.
The engine is a fresh rebuild by a very experienced flathead specialist, the radiator also received a new modern style core, new water pumps with the improved impellor design and the stock four blade fan. Total miles driven so far are 45, and on the open road the engine runs between 170 and 180 degrees. I realize the engine will run cooler with more miles driven and a sufficient break in period, but for now I need to do something to aid during the extreme conditions during parades as I know he will be doing more of those this summer. I have tried to research the thermostats made by Bob Shewman that fit into the upper hoses, that have been discussed in several forums. The majority of the posts relate to bringing the engine temperature up, because the vehicle run too cool and never quite get to operating temperature. I am wondering about their effectiveness in maintaining the temperature during slow driving conditions such as a parade. Ideally, the thermostat should allow sufficient time for the water in the radiator to cool before it cycles back into the motor. From what I have read about the Shewman thermostats they have bypass holes to prevent a surge of pressure when they reach temperature and open. Will that limit the amount of cooling efficiency of the radiator? I would appreciate any feedback from those who my have encountered a similar situation, or have experience with these thermostats. I found an email contact for Bob Shewman ([email protected]) and have sent him an inquiry as well with no response back, so I am wondering if that is no longer a valid contact. If anyone has his current information I would appreciate that as well. Thank you for your assistance. |
03-02-2015, 02:15 PM | #2 |
Senior Member
Join Date: May 2010
Location: so cal, placerville, vegas
Posts: 1,394
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Re: 1934 Pickup overheating issues
I dont see a fan or generator in pic... for whatever it's worth, and in addition to the usual comments & suggestions, I put on a 6-blade fan on my own 34, and it became a little more 'parade-friendly'.
my best choice, stay out of parades just opinion |
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03-02-2015, 03:24 PM | #3 |
Senior Member
Join Date: May 2010
Location: Kokomo, Indiana
Posts: 1,731
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Re: 1934 Pickup overheating issues
If you haven't already done so, check the timing. Retarded timing will cause the engine to heat. That would show up at idle speeds quicker than at highway speed.
In addition to a 6 bladed fan, a fan shroud might also prove useful. Do you know how the block was cleaned, internally, at the time of rebuild? That can make a difference, too.
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Henry |
03-02-2015, 03:29 PM | #4 | |
Senior Member
Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
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Re: 1934 Pickup overheating issues
Quote:
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03-02-2015, 05:31 PM | #5 |
Senior Member
Join Date: May 2010
Location: Powell, TN
Posts: 2,509
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Re: 1934 Pickup overheating issues
I have a 59AB 60 over with HC heads in my 34 PU with an original rad core. Stock fan and exhaust wedge dividers. It runs very cool. Tried it without the fan and it still ran cool on the road but began to heat in stop and go traffic.
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03-02-2015, 06:40 PM | #6 |
Senior Member
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Re: 1934 Pickup overheating issues
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