Cracked head or gasket???

[zane]

The 4m40 overheated today. Replaced the thermostat which was nakkid, but still lots of white frothy bubbles coming out of radiator with cap off.

Anyone had this. Cracked head or gasket maybe? Radiator looks good and clean.

Help needed please...

[Mattman]

Head off time. Difficult to tell otherwise.

[zane]

Any idea of time it takes to get head off? Are there any threads here with details?

[tweake]

odds are its cracked head.
diesels very rarely blow the head gasket.

[cornflake]

put sum of that block seal in and do it properly ie put it in run it then drain it out then let it harden

did that in a nivara and was sweet as still going to day