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70 diesal

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matt

02-08-2003 19:58:57

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I have a 70 diesal that while it is running it bubbles up in the radiator. It does not have any coolant leaking into the cylinders when it is shut down and the coolant level never changes. Wondering if might be a head gasket or what?? Thanks

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G Taylor

02-09-2003 07:19:50

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Re: 70 diesal in reply to matt, 02-08-2003 19:58:57

It's normal for 70D's to crack the origional cylinder head. Most out there are wearing the 720/730 head with bigger intake valves.What part number is on the head? A too keen operator on a 70D/720D/730D in cold weather can blow a head gasket by heavily loading the engine before engine has warmed enough to open the thermostat.

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Clooney

02-09-2003 05:34:35

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Re: 70 diesal in reply to matt, 02-08-2003 19:58:57

Matt, it sounds like a head gasket or cracked head. When it's making bubbles you might try running for a short time with the water pump belt disconnected to see if the pump is sucking air.
~Is there any signs of combustion by-products in the radiator, if so you almost certainly have a head gasket or cracked head.

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F-I-T

02-09-2003 07:01:02

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Re: Re: 70 diesal in reply to Clooney, 02-09-2003 05:34:35

Matt:

I, too, think it sounds like a head or head gasket.

Here's something you might want to try. A lot of the old timers would warm the engine up, take the radiator cap off, lock the brakes, and with an observer perched clinging for life to the front end and looking down the open radiator, load the engine down in road gear (without letting the tractor move, or you might injure your observer). This will increase the volume of exhaust gases and pressure immensely and will reveal if what you have is water pump related or head/head geasket related.

Sometimes the water will literally jump out of the radiator as a huge bubble of gas comes up, so be careful !

Frank-in-Tallahassee
70D // 855

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