Too much radiator pressure

JLG · Apr 26, 2018

On a 730 diesel- it has so much pressure in
the radiator that its blowing water out.
It's NOT over heating, didn't even warm up
yet, and the oil is not milky. Sound like a
cracked head? And if so, why is the oil not
milky?

Thanks.

Dieseltech · Apr 26, 2018

Sounds like compression pressure leak into the coolant passages. May or may not have any coolant into the oil, depends where the leak is.

Blksmok · Apr 26, 2018

Sounds like a bad head gasket. Common problem on the two cylinder diesels.

chuck from neb · Apr 26, 2018

Bad head gasket

John Deere D · Apr 27, 2018

Quote:

On a 730 diesel- it has so much pressure in the radiator that its blowing water out. It's NOT over heating, didn't even warm up yet, and the oil is not milky. Sound like a cracked head? And if so, why is the oil not milky?

Neighbour had the SAME operating conditions on his JD 70 Diesel:

Removed the Main Engine HEAD....failed head Gasket:

Installed new head Gasket, new engine Thermostat (NOS), new temperature gauge, and re-torqued head after 2 hours of heavy working;

Neighbour would not have HEAD machined:

Followed instructions on Loctite 515 sealant:

515 sealant applied liberally to both sides of head gasket:

Bob..

John Deere D · Apr 27, 2018

Quote:On a 730 diesel- it has so much pressure in the radiator that its blowing water out. It's NOT over heating, didn't even warm up yet, and the oil is not milky. Sound like a cracked head? And if so, why is the oil not milky?

Neighbour had the SAME operating conditions on his JD 70 Diesel:

Removed the Main Engine HEAD....failed head Gasket:

Installed new head Gasket, new engine Thermostat (NOS), new temperature gauge, and re-torqued head after 2 hours of heavy working;

Neighbour would not have HEAD machined:

Followed instructions on Loctite 515 sealant:

515 sealant applied to both sides of head gasket:

Bob..

Too much radiator pressure

JLG

Member

Dieseltech

Well-known Member

Blksmok

Member

chuck from neb

Member

John Deere D

Well-known Member

John Deere D

Well-known Member

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