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Radiator cap

H

Harry Marks

New User
I bought a 1974/ 2000 ford tractor in april 2012. the problem is when I start it 'it about 2 or3 minutes antifrezze runs out the over flo. napa gave me a radiator cap #703-1696 antifrezze still runs out the overflo.I used a dept mic to check from top of neck to the seat.It was .777.5 The cap is .774.Im thinking some one before I bought it,maby put a diesel radiator in it?
 
If you are filling it to the neck, that is the issue. There is no overflow reservoir on it. (plastic bottle with rubber hose) so it needs to have expansion space like old cars! Jim
 
also make sure the new cap is rated for the pressure that the tractor is designed to run at a 15 lb cap on a system rated for 6 lb is trouble waiting to happen not sure what a 2000 system is rated for but you need to check, my old ford is 6 to 8 like already mentioned fill the radiator but leave 1 or 2 inches for expansion, dont fill it up to the neck
 
The manuals for my tractors say 1" over the core on a cold engine is correct for full. This ensures that the tubes in the core are full when operating and leaves room for the coolant to expand.

A blown head gasket will show up as bubbles in the coolant with the cap off and engine running.

HTH,
Mark
 
Fill radiator to top of cap. Keep more water ready to poor in. Then run engine at high speed under a load if possible keep the radiator full. Watch for bubbles a stream of bubbles indicates a small head gasket leak. If it keeps eating up the water as fast as you can poor it in you got real trouble. Sounds like you have a real bad leak.
Walt
 
It's likely an expansion problem because the rad is too full, but there is a definitive test, that will tell you if you have exhaust gasses in the coolant. THe test kit has a rubber stopper, a brass screen stone, and a clear graduated cylinder, which you fill with the blue liquid in the kit. You start the motor, let it get up to operating temperature, and follow the directions on the kit. If the blue liquid changes to yellow, you have exhaust gasses in the coolant, and a bad head gasket, or bad block, head or other problem!
 
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