It's far more common for the head gasket to blow and allow exhaust gasses into the water jacket , especially so in iron heads .
The test is very simple , a device fitted in lieu of the radiator cap is filled with yellow liquid & the engine started , goose the throttle and if the liquid turns purple , you've got a combustion leak .
Farm/junkyard way : engine hot , remove fan belt and top up coolant to the top of the radiator neck , start the engine and tromp on the throttle ~ if you see tiny bubbles , it ain't Tony Bennet coming to visit .
-Nate
Chuck wrote:
>
> anyone heard of exhaust gases leaking through a crack in the head and heating up the coolant?
>
> shop is checking the theory.
>
> chuck
>
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[diesel_mercedes] Re: 300SD overheating latest update
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