Cooling system pressure

showcrop · Oct 4, 2015

My buddy stepped up from hot farm stock to hot farm a year and a half ago with his D-21 Allis. He now turns considerably more RPMs and it seems that every time he hooks,the cooling system pushes a little coolant from the start line, then after a little way down the track it turns into a geyser. His somewhat mechanic keeps re-soldering the neck onto the top of the radiator. I believe that the higher RPMs are causing the system to over-pressurize more than the cap can release, and he needs to either put a smaller pulley on the pump or put an electric pump on it. Any body have experience with this?

VicS · Oct 4, 2015

It could be to much volume. Probably needs
a electric pump anyway. But sounds like a
compressionleak

showcrop · Oct 4, 2015

(quoted from post at 10:15:04 10/04/15) It could be to much volume. Probably needs
a electric pump anyway. But sounds like a
compressionleak

I don't think that it is compression due to the lack of any other problems that have accompanied blown head gaskets etc. in the past, as well as the fact that as it comes out it is apparently hitting the underside of the hood and then coming out the sides as the appearance of a water fall as opposed to appearing foamy with air.

TDoolittle · Oct 4, 2015

Sounds like compression is getting the coolant. The head studs are probably stock and stretching
under a load.

showcrop · Oct 4, 2015

(quoted from post at 12:22:04 10/04/15) Sounds like compression is getting the coolant. The head studs are probably stock and stretching
under a load.

Nope

ericsegaline · Oct 4, 2015

Put electric pump on problem solved my supper stock tractors all did it rpm is couseing it

showcrop · Oct 4, 2015

(quoted from post at 17:21:38 10/04/15) Put electric pump on problem solved my supper stock tractors all did it rpm is couseing it

Thanks, Eric. Do you know if anyone makes one for the D-21? I know that they make bolt on ones for the more popular motors.

LCB · Oct 5, 2015

I agree with VicS. When you are at lower RPMs you are just leaking a little and when the RPMs come up it puts more pressure on it and it leaks more.

buickanddeere · Oct 5, 2015

Compression and combustion gasses into the cooling system . Take the spring out of the rad cap, fill the rad to just the top of the cores. Run the overflow line to a catch bottle.

showcrop · Oct 5, 2015

(quoted from post at 11:45:43 10/05/15)
Compression and combustion gasses into the cooling system . Take the spring out of the rad cap, fill the rad to just the top of the cores. Run the overflow line to a catch bottle.

This would require a two inch overflow line into a 2.5 gal. jug.

770puller · Oct 5, 2015

Had a built 2.6" Cummins truck kept pushing freezes plugs
out or blowing cap off radiator , you can't imagine amount of
water that water pump moves at 5000 rpm, anyway it can't get
back into the block fast enough put an electric on it and be
done, won't be lint and bearings in pump are gonna give
anyway

showcrop · Oct 6, 2015

(quoted from post at 20:27:27 10/05/15) Had a built 2.6" Cummins truck kept pushing freezes plugs
out or blowing cap off radiator , you can't imagine amount of
water that water pump moves at 5000 rpm, anyway it can't get
back into the block fast enough put an electric on it and be
done, won't be lint and bearings in pump are gonna give
anyway

Yesterday I tracked down a D-21 puller in PA and found out what pump he used and how he adapted it. Now my buddy has to just convince his mechanic to quit blaming the solder, LOL.

buickanddeere · Oct 6, 2015

Should be mostly gasses not fluid going into the catch bottle . If the coolant level is up into the rad tubes and fins but not into the top tank.

showcrop · Oct 6, 2015

(quoted from post at 08:27:26 10/06/15)
Should be mostly gasses not fluid going into the catch bottle . If the coolant level is up into the rad tubes and fins but not into the top tank.

It's not foam it is a wave of green water.

jmcarlic · Oct 6, 2015

I suppose it is possible that the pump is exceeding the volume the radiator will allow through it. Make sure the radiator is good and clean, no bent or crushed tubes, no restrictions elsewhere past the radiator either.
Are you running a thermostat? It should slow down the flow and prevent that if not.
A reduction pulley (if they're even available) may help, but an electric pump will keep a nice, steady flow of coolant and is able to continue running even after you've shut the tractor down.

Good luck and let us know what you find out if you do figure it out.

buickanddeere · Oct 9, 2015

Then there is something wrong . Put a thermostat or a restrictor in the system limit gpm. Try a brief snort with the fan belt off so the pump is not rotating. I'll bet she still pours coolant out.

Cooling system pressure

showcrop

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VicS

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showcrop

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TDoolittle

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showcrop

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ericsegaline

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LCB

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buickanddeere

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770puller

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