as above, could a cosworth head crack and allow oil to be pumped into the water and water also into oil?? if so were would it have cracked? and would it be visible when off?

i no all the other possibility's of what could cause this, just asking about the head at the min ,

cheers

 

lol all the experts on here but no ones going to comment.......

 

Sounds more like the oil modine to me. I suppose it is worth a try to remove it and check the results, before writing the head off

 

as said above the modine oil cooler on the side of the block or head gasket being obvious, or cracked cyliunder head but could be anywhere, and you wont know until you take it off and have it pressure tested unless theres an obvious easy to see crack, anything is fixable though its just the cost

 

it is possible. i had a bmw 535 boil up on me and that started getting oil in the header tank and a misfire when cold. i replaced the headgasket but it didnt sort it.

 

runs a remote filter/ oil cooler so no modine, engine is fresh build having been bored decked longstudded etc etc i no the block as my old engine , so other than a long stud drilling being done wrong cant think of what else it could be with the block, head was supplied by a dealer so i dont no history of it but its had a skim and looked fresh, defo no gasket blow been checked,

this has black oil in header , water system flushed 4 times still puts oil up
oil in engine all milky flushed 4 ++ times

looks like its all gotta come out again!!, just asking if the head could course such a problem??