Radiator runs hot

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Model T Ford Forum: Forum 2017: Radiator runs hot
Top of pagePrevious messageNext messageBottom of page Link to this message  By rick howerton on Sunday, November 26, 2017 - 03:22 pm:

what is the formula for testing a radiator. Don`t you fill it up with water, and with your hand on the bottom port you take your hand off and count the seconds it takes to empty , but how many seconds is ok?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Sunday, November 26, 2017 - 03:55 pm:

There are several reasons the radiator runs hot. It can be perfectly clean and still run hot.

One reason of course is a clogged radiator and cleaning will fix that one.

Two others are when the engine is out of tune and especially spark too far retarded and gas too lean.
Also bands or brakes too tight causing a drag on the engine. These causes can be fixed by proper adjustment

And another one which is almost always the case with an old radiator. That is poor heat conductivity between the tubes and the fins on the radiator core. This one cannot be fixed without a new core or a new radiator.

Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By rick howerton on Sunday, November 26, 2017 - 05:09 pm:

How do you check a radiator to see if it is stopped up?


Top of pagePrevious messageNext messageBottom of page Link to this message  By john kuehn on Sunday, November 26, 2017 - 05:31 pm:

Is it a original radiator? If it is most of the time your wasting your money trying to clean up a 90-100 year old radiator. Been there and done that . If its a original round tube its usually a waste of time..
.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Hal Schedler, Sacramento on Sunday, November 26, 2017 - 05:46 pm:

Check for cold or hot spots by feeling the front of the radiator. Clogged areas of the radiator would be cooler. Best done shortly after start-up when the engine is warming up or just getting to temp..


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan Treace, North FL on Sunday, November 26, 2017 - 06:09 pm:

Rick

You didn't explain how hot is your radiator?

An objective way is to use inexpensive infrared thermometer to measure.

The upper tank of the radiator receives the hot coolant from the cylinder head outlet. Measure that by pointing at the metal upper tank. Then measure the temp of the metal lower pipe, that is carrying the coolant that has fallen thru the radiator. Do this at idle, with engine warm to operating temp.

You should see a big difference if the radiator is doing its heat to air exchange.


Upper tank measure, 90 degree day, engine warmed from 10 minutes running on road, then pulled over at idle and temp measured.


Simultaneous measure of lower pipe and note the cool coolant going back into the block.

Over 60 degree difference, system working fine.


Top of pagePrevious messageNext messageBottom of page Link to this message  By rick howerton on Sunday, November 26, 2017 - 06:28 pm:

It is someone elses rad.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Tim Wrenn-Monroeville OH on Sunday, November 26, 2017 - 07:35 pm:

Rick...once you stop up all the openings that obviously would let water out, fill it to the top of the tank. When you open the bottom hose opening start counting...a good radiator should void all it's water in 4-5 seconds. Even a measely 7 seconds means trouble. Trust me, after replacing 4 radiators, I've been there! My brand new one's dump their water in exactly 4 seconds.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Les Schubert on Sunday, November 26, 2017 - 07:48 pm:

Another possibility if the system is running too hot (boiling when it shouldn’t), is a compression leak into the water system.
A quick and cheap and easy way to clean a radiator is remove it, seal the filler neck and lay it on its front and pour in enough vinegar to fill the core. Leave it overnight and dump it out and reverse flush with lots of water. Does it now drain better as described by the (4 second test).
Just some of my experiences


Top of pagePrevious messageNext messageBottom of page Link to this message  By rick howerton on Sunday, November 26, 2017 - 08:47 pm:

thanks Les that was what I wanting ti hear And thanks toall the other help also Y ou guys are a great help!!!


Top of pagePrevious messageNext messageBottom of page Link to this message  By rick howerton on Sunday, November 26, 2017 - 08:55 pm:

And a special thanks to Tim that was the formala I needed to time flow


Top of pagePrevious messageNext messageBottom of page Link to this message  By Tim Wrenn-Monroeville OH on Monday, November 27, 2017 - 08:57 am:

Any time Rick! Let us know how it turns out.


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