08-20-2014, 06:47 PM | #21 |
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Re: Overheating
I had a Model A a few years ago with the same problem; I couldn't figure it out. The water pump seemed ok but it turned out that although the shaft and propellor turned correctly the shaft was broken behind the packing nut. Everything looked fine but the impellor was sheard off behind the nut.
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08-20-2014, 06:49 PM | #22 | |
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Re: Overheating
Quote:
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Bill Worden 1929 Roadster 1929 Briggs Town Sedan 1930 Closed Cab pickup Smith Motor Compressor 1951 Ford F1 High Desert Model A's |
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08-20-2014, 07:27 PM | #23 |
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Re: Overheating
Bill
Since you found #4 water jacket plugged you have to think that maybe some of that crud might have traveled into the radiator and is restricting flow. I would flush the radiator really well if not have it cleaned, (rodded out), again to be sure. Just a thought so you cover all your bases. |
08-21-2014, 09:52 AM | #24 |
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Re: Overheating
An engine is only going to produce a certain amount of heat! The total heat output does not rise that much if the cooling passages around a cylinder are clogged! Sure there will be additional friction which produces heat, but how much can that be compared to the heat of combustion? In the case of clogged cooling passages, less heat would be transferred to the coolant, not more! The heat not absorbed by the coolant because of the clogging, would have to be absorbed by the block and radiated to the atmosphere via the outside surface of the block and the oil pan or escape via the exhaust. A radiator with adequate capacity should be able to handle the reduced heat transfer because of a clog! I suspect your radiator even though you have clogged cooling passages! I took my problem radiator to a competent shop and even though they worked on it, they made it clear to me that it was old and might not work! It cost me forty five dollars to learn that lesson!
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08-21-2014, 10:32 AM | #25 |
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Re: Overheating
an A has marginal cooling at best. so now it is OK to have a clogged block?
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08-21-2014, 11:52 AM | #26 |
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Re: Overheating
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With the design of the A engine I would think any restriction of water flow could cause an overheating problem including using too much silicone to install the head. Actually I believe there was a thread recently on the Barn that said they had an overheating issue because someone used too much sealant when installing the head. |
08-21-2014, 02:25 PM | #27 |
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Re: Overheating
Be sure to check the intake manifold to block for a vacuum leak.
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08-21-2014, 02:53 PM | #28 |
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Re: Overheating
Yep.
"The heat not absorbed by the coolant because of the clogging, would have to be absorbed by the block and radiated to the atmosphere via the outside surface of the block" It is well-established physics that dictates that heat transfer via water is MUCH more effective than via air
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08-21-2014, 03:22 PM | #29 |
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Re: Overheating
Having the radiator serviced really means nothing unless the tanks are removed and tubes are rodded out,I went through this with a studebaker,changed and checked everything but still ran hot,I finally had the radiator recored,at last normal temp in hot summer.
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08-21-2014, 07:06 PM | #30 |
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Re: Overheating
What does everyone think of waterless coolant. No corrosion and 360 degree boiling point sound like a good idea to me.
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08-21-2014, 07:12 PM | #31 |
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Re: Overheating
I side with the guys who are telling you to do something with the radiator. Over the years, the water pump was lubricated with the wrong grease. When hot, the grease carries over to the radiator, cools and deposits in the core. I had the top of my radiator off and sprayed Gunk degreaser into each tube and carefully rodded them out, pushing the grease and rust into the lower tank and rinsing it out. A radiator shop could not possibly get enough pressure and velocity flow into each tube to do the job. After the job, the car ran at 160F on the hottest days. Look at other posts in the archives on how to rod out a radiator. Ed
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08-21-2014, 07:34 PM | #32 |
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Re: Overheating
I agree with Ed about how the grease forms in the tubes, and removing the tank and rodding the tubes is the very best solution, but I wanted to try to avoid that if possible. So, I used about half a cup of Cascade and water for 3 days, then switched to pure white vinegar for 30 days. I also removed my radiator and turned it upside down and connected it to a sump pump to backflush it. This did work in my case.
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08-21-2014, 07:48 PM | #33 | |
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Re: Overheating
Quote:
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08-21-2014, 10:15 PM | #34 |
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Re: Overheating
If you are trying to say that a clogged block will cause overheating then I am with you 100%
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08-23-2014, 06:28 PM | #35 |
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Re: Overheating
If the engine is blocked, the radiator probably is too!
Ours ran fine most of the time, except steep climbs where it would push water out the over flow and cap. We had the radiator opened and rodded out, and got about 1.5 cups of crap out of it, just from the mechanical process! They soaked it after that. Runs perfectly well now, even on long steep climbs in hot weather - we've since added a thermostat(160F) and temp gauge, and worst i've seen since was about 195F on a long steep climb, where I was starting to get concerns about double clutching and actually making it into FIRST gear while moving
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08-24-2014, 07:55 AM | #36 |
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Re: Overheating
When you have a problem like this how well do "extra cooling" mods help? Such as more blade fans or fan shrouds? I know it's not fixing the problem but they are way cheaper than a new radiator.
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08-24-2014, 07:57 AM | #37 | |
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Re: Overheating
Quote:
and then in the end youll need a radiator and engine thats if the block is not clogged |
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09-08-2014, 02:07 PM | #38 |
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Re: Overheating
Well, we finally made it. I cleaned all the block passages, and let the block sit for 10 days, full of vinegar. That got a lot of rust out. I put a flexible light inside the lower tank and could see through the tubes so I knew at least the center ones were in pretty good shape. I noticed the radiator was leaking behind the hood rod mount, and the radiator had guy told me that he was afraid to do anything with it. So I decided to bite the bullet and head to Bert's. Steve explained to me that even though it was a triple tube radiator, because the tubes were all in a line, the rear ones weren't getting much air. Now I have a calm, cool, collected, Town sedan with a beautiful 4 tube radiator.
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Bill Worden 1929 Roadster 1929 Briggs Town Sedan 1930 Closed Cab pickup Smith Motor Compressor 1951 Ford F1 High Desert Model A's |
09-08-2014, 02:41 PM | #39 |
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Re: Overheating
Persistence eventually pays off. Bob
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