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Farmall BN overheating

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RobertPA

06-07-2005 18:18:12

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My BN overheated the other day. Top of radiator was burning hot and bottom was cold. Flushed radiator with prestone. Same result burning top and cold bottom. Took radiator off and flushed with garden hose and seems open fine. Stuck hose in tractor and flushed from head down and seemed fine. Since radiator seems open could I have a bad head gasket? When I started it before driving that day noticed something sprayed out exhaust stack then cleared up (antifreeze?) Compression was 100 psi all cylinders and radiator seemed clean green antifreeze. Thanks.

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lee

06-08-2005 16:53:51

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

That radiator might work ok if the tractor had a water pump but the thermo syphon system requires the tubes be clear and unrestricted. It may seem open with a garden hose running thru it but it might not thermo-syphen for ya. You may also have some other problems but you need to know you have a good rad before you can move on to those...
You do have the correct radiator I assume?

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Ron Penrod

06-08-2005 13:21:37

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

Try draining all the antifreeze an put only water back in, see if you get the same results. I've heard if you get too heavy of mixture on the antifreeze side you will get poor circulation with this system.

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JMHF

06-08-2005 11:48:18

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

Too much "anti-freeze" in the water? I think that will not let the fluid circulate.

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Dave

06-08-2005 11:03:16

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

hope ya mixed the antifreeze 50\50.pure antifreeze wouldnt "perk" in my old A..had the same troubles.wouldnt expand so didnt cool.

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RobertPA

06-08-2005 14:57:51

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Re: Farmall BN overheating in reply to Dave, 06-08-2005 11:03:16

Antifreeze in it was 50/50 mix. I tried straight water with same results. Timing is OK too. Thanks for the ideas. Looks like I am maybe in for buying a new one.

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El Toro

06-08-2005 10:08:12

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

Hi Bob, I called the radiator shop in my area, they been in business for 60 years. They think the tubes are plugged and don't think that old radiator would withstand being rodded.

Your local radiator shop may be able to back flush it. It would be worth a try. Hal

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RobertPA

06-08-2005 14:55:23

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Re: Farmall BN overheating in reply to El Toro, 06-08-2005 10:08:12

Thanks Hal. I called a shop today and they pretty much said the same thing. I called TSC and a new radiator is $273 plus tax. Cost to boil it is $40 with no guarantees. If they are able to rod it will be around $85 or higher if problems.

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captaink

06-08-2005 08:52:37

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

Is your ignition timing correct? Incorrect timing can cause an engine to run hot!

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gene b

06-07-2005 20:19:39

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

You should have flushed the block from bottom to clear the small holes at the base of the sleeves also using some compressed air. Lots of these blocks have some crud down at the bottom of the sleeves and are slowing down the flow of coolant. Is the overflow tube clear in the radiator. When you shut down the engine take a temp of the coolant it should not be over175 or so. Are the fins clean and was the fan belt tight enough. Have yet to see a radiator plugged inside problems are about always plugged in the block. There is no thermostat so that is not an issue. You can always add a water pump for a C all you need is a longer fan belt.Not hard to install.

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RobertPA

06-08-2005 05:00:18

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Re: Farmall BN overheating in reply to gene b, 06-07-2005 20:19:39

Gene-I had this block boiled out at a machine shop before reassembly. New sleeves, pistons etc. The radiator is used from a tractor that we found sitting. The guy said it was a fairly new radiator but I don't know how long it sat.

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old

06-07-2005 19:24:46

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

Does it have a thermostat in the system?? If it does there the problem its not working as it should. If it doesn't then you have clooged engine cooling area. Those flushes you buy at the parts houses are worth less, fill the system with vineagar run it for an hour or so then flush with water. Been ther done that, I have an oliver 77 that would get hot fast and used the part house flushes and it didn't help any, try vineagar and did as I said and it hasn't got hot since

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El Toro

06-07-2005 18:52:22

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

Hi Bob, Are you sure that radiator isn't plugged?
It sounds like the tubes may need to be rodded. I would talk to your local radiator man.

Have you looked into the radiator when the engine is idling to look for any bubbles? Your coolant doesn't seem to be circulating through the radiator. Bubbles in the radiator
could be a blown head gasket or a cracked head.
Our local radiator shop told me a good way to tell if the radiator is plugged is to feel the surface over the entire radiator. Should be hot all over when engine reaches operating temp. Hal

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RobertPA

06-07-2005 19:04:52

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Re: Farmall BN overheating in reply to El Toro, 06-07-2005 18:52:22

I felt the surface of the radiator and only the top was hot.Real hot and got cooler and you ran you hand down until cold at the bottom.

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El Toro

06-08-2005 03:46:17

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 19:04:52

I still think the radiator tubes are blocked. Hal
PS: I'll call our local radiator shop today and I'll let you know what they think about the radiator.

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RobertPA

06-08-2005 04:56:13

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Re: Farmall BN overheating in reply to El Toro, 06-08-2005 03:46:17

ElTOro-thank you. I would appreciate that.

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RobertPA

06-07-2005 18:23:10

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:18:12

Another thought-would a bad head gasket cause the thermosiphon system to now flow right? Thanks for any input, I'm lost.

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Pharmall

06-07-2005 20:00:08

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Re: Farmall BN overheating in reply to RobertPA, 06-07-2005 18:23:10

Was just wondering the same thing. If a bad head gasket is letting hot combustion gases blow directly into the cooling system, could it be that it's just heating up the coolant too fast for the radiator to remove the heat? But that wouldn't explain why the bottom of the radiator is cold, unless you are not letting it run long enough (I'd be scared too!).

Here's a theory - a piece of the blown gasket broke loose and is blocking a bunch of the small inlet tubes at the top of the radiator. That would explain why the radiator is not removing much heat, but still lets water from your garden hose through the unblocked holes. It would also explain the spray from the exhaust, but it doesn't jive with the good compression test. Does it still spray when you start up?

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RobertPA

06-08-2005 05:06:00

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Re: Farmall BN overheating in reply to Pharmall, 06-07-2005 20:00:08

I didn't notice any spray when starting it to let it run when using the prestone radiator cleaner. I thought if the head gasket was bad It would have low compression in a cylinder. When I built this engine I didn't have the cylinder resurfaced. This tractor went through a barn fire and was destroyed. It took me 2 1/2 years to make it look good again. It was my grandpa's tractor.

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Janicholson

06-08-2005 18:50:19

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Re: Farmall BN overheating in reply to RobertPA, 06-08-2005 05:06:00

I believe in the pluged tubes answer. An ugly suggestion is to use any vertical tube radiator that is good and hook up longer or different hoses, and fill it up. If there is heat all the way to the bottom the problem is the old rad. Recoring the old one is also a possible solution 1/2 way between a new, and a potential failed rodding out.\
Good luck
JimN

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