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Old 05-01-2013, 07:21 PM   #1
Eric H
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Default Help, 8ba suddenly running hot.

My 51 ford has run at a normal temp for the first 500-600 km. Today the needle is pinned after just a few minutes of driving. Please help, I need advice.
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Old 05-01-2013, 07:25 PM   #2
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Default Re: Help, 8ba suddenly running hot.

The only thing I can think of is that I put the battery in backwards accidentally for about a minute yesterday. (brain fart) Could this have messed up the gauge?
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Old 05-01-2013, 07:26 PM   #3
ken ct
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Default Re: Help, 8ba suddenly running hot.

Possibly a stuck closed thermostat?? ken ct.
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Old 05-01-2013, 07:27 PM   #4
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Default Re: Help, 8ba suddenly running hot.

I guess it might?? ken ct.
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Old 05-01-2013, 07:28 PM   #5
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Default Re: Help, 8ba suddenly running hot.

The needle come down at times for a few seconds and then rises back up fast or slow does not seem to matter.
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Old 05-01-2013, 07:40 PM   #6
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Default Re: Help, 8ba suddenly running hot.

You said the gauge shows hot......is the motor hot? You might take out the thermostats and see what happens if the motor is hot.
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Old 05-01-2013, 07:49 PM   #7
joe 1950
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Default Re: Help, 8ba suddenly running hot.

also could be low coolant level, is it up to cover the core , also their is two senders you could dissconect one at a time to see which side is the problem ,connecting the batt. backwards could damage the gauge , how do the oil and fuel gauge read
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Old 05-01-2013, 07:55 PM   #8
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Default Re: Help, 8ba suddenly running hot.

Stock gauge? Do you have a laser temp gun? Aftermarket gauge ? Install on one side and see what happens.
Ken CT's idea of a stuck thermostat is an easy item to check .
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Old 05-01-2013, 08:35 PM   #9
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Default Re: Help, 8ba suddenly running hot.

Thanks guys. I am going to check the thermostats and try disconnecting one censer at a time to see if I can get to the bottom of this.
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Old 05-01-2013, 08:36 PM   #10
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Default Re: Help, 8ba suddenly running hot.

Maybe I should buy a pair of mechanical temp gauges?
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Old 05-01-2013, 08:46 PM   #11
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Default Re: Help, 8ba suddenly running hot.

what does the gauge say when the key is on in the morning before the engine has been run?
Basically the same question as above
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Old 05-01-2013, 08:48 PM   #12
Eric H
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Default Re: Help, 8ba suddenly running hot.

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what does the gauge say when the key is on in the morning before the engine has been run?
Basically the same question as above
Reads cool.
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Old 05-01-2013, 08:49 PM   #13
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Default Re: Help, 8ba suddenly running hot.

Mechanical temp gauges would be nice if you don't mind the way they look. Remember with the two stock sensors, the one with two terminals is just a switch that opens when the engine has overheated. The single terminal sensor is the one that operates the gauge. If the double terminaled one opens, the gauge goes to "Hot" because all power id cut off from the circuit.

I'd check the thermostats and coolant level first. Easy and cheap. Good luck!!
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Old 05-01-2013, 08:58 PM   #14
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Default Re: Help, 8ba suddenly running hot.

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Originally Posted by Henry/Kokomo View Post
Mechanical temp gauges would be nice if you don't mind the way they look. Remember with the two stock sensors, the one with two terminals is just a switch that opens when the engine has overheated. The single terminal sensor is the one that operates the gauge. If the double terminaled one opens, the gauge goes to "Hot" because all power id cut off from the circuit.

I'd check the thermostats and coolant level first. Easy and cheap. Good luck!!
I did not realize that. Thanks.
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Old 05-01-2013, 09:01 PM   #15
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Default Re: Help, 8ba suddenly running hot.

I was just reminiscing about the small pinhole leak that I had in my rad last year. I added some bars leak type crap that stopped the leak. Maybe it has turned my rad in to a low flow model?
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Old 05-01-2013, 11:34 PM   #16
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Default Re: Help, 8ba suddenly running hot.

That crap stopped up my 36 rad real good.I would never use it again. ken ct omo
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Old 05-02-2013, 05:26 AM   #17
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Default Re: Help, 8ba suddenly running hot.

never use barrs leak it plugged up my original rad completely wish i had taken it to a repair shop to begin with...
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Old 05-02-2013, 08:36 AM   #18
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Default Re: Help, 8ba suddenly running hot.

Eric - My temp gauge went out last year. I got two mechanical gauges (One for each head) from NAPA. Easy to install and work great. Two problems - light is 12 volt and if you want to mount under the dash you have to drill a pretty good size hole throught the firewall.
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Old 05-02-2013, 08:47 AM   #19
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Default Re: Help, 8ba suddenly running hot.

Common sense would say to check the temperature with a thermometer.
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Old 05-02-2013, 09:37 AM   #20
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Default Re: Help, 8ba suddenly running hot.

I agree that you need to measure the real engine temp, but if the car is as hot as the needle says, you'll definitely feel it when you open the hood. There's a big difference between 180 degrees and 220. The engine will be saying "don't touch me or you'll get burned for sure".
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Old 05-02-2013, 10:13 AM   #21
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Default Re: Help, 8ba suddenly running hot.

Check first for loose or corroded wire/terminals on the sensor or gauge.

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Old 05-02-2013, 10:14 AM   #22
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Default Re: Help, 8ba suddenly running hot.

If the engine is not hot, you may just have a loose connection or the sending unit with 2 connections could be opening up.
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Old 05-02-2013, 10:47 AM   #23
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Default Re: Help, 8ba suddenly running hot.

Are you puking up antifreeze? If the gauge is pinned, I would think you would see a lot of coolant lose through the overflow. Mine did that a few years ago - turned out it was a leaking head gasket.
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Old 05-02-2013, 10:55 AM   #24
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Default Re: Help, 8ba suddenly running hot.

Did you know there is only one stop leak on the market today, designed for non pressurized systems? I called all three manufacturers tech lines a couple of years ago, and that's whAt I found out. Chuck
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Old 05-02-2013, 11:33 AM   #25
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Default Re: Help, 8ba suddenly running hot.

Chuck - and the stop leak product would be...?
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Old 05-03-2013, 11:48 AM   #26
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Default Re: Help, 8ba suddenly running hot.

Quote:
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Chuck - and the stop leak product would be...?
Bars. PN 1196. Old PN is C-16. I've used in my A for 2 years and counting for a leaking head. ( welded repaired police head) one of these days I'll buy a new snyders!
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Old 05-21-2013, 12:47 PM   #27
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Default Re: Help, 8ba suddenly running hot.

Ok guys. It turns out it was the gauge. I ordered two SW mechanical temp gauges and it turns out they have a huge pipe thread that is larger than the holes in the heads. Is there an adapter or can I braze a bung in to each water neck. If so, will this give me an accurate temp.
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Old 05-21-2013, 01:54 PM   #28
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Default Re: Help, 8ba suddenly running hot.

Quote:
Originally Posted by Eric H View Post
Ok guys. It turns out it was the gauge. I ordered two SW mechanical temp gauges and it turns out they have a huge pipe thread that is larger than the holes in the heads. Is there an adapter or can I braze a bung in to each water neck. If so, will this give me an accurate temp.
Most gauges come with a handful of adaptor fittings. I wouldn't braze/weld/solder anything. Go to an auto parts/plumbing supply/hardware store for a set of adaptors.
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Old 05-21-2013, 05:57 PM   #29
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Default Re: Help, 8ba suddenly running hot.

The heads are usually tapped 3/8 pipe thread. As Mike said, usually the gauges come with a bunch of adapters. Might have to go an auto supply store to get some if they didn't come with yours.
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