Right Chaps, as some of you know my brother has recently bought a JDM Bug STi with a knackered bottom end. A replacement engine was sourced and fitted this weekend which benefited from new Cam Belt and tensioners, plugs, rocker cover gaskets, crank shaft oil seal and a clutch change while it was easy to get at everything.
The replacement engine (which was sourced from a reputable breaker who ran the car for a week before breaking) runs fine but from the moment it went in has been blowing water back into the header tank and overheating. The engine does not over heat if you drive it off boost or leave it on tick over all day but as soon as you give it boost it blows all the water into the overflow bottle. He's bled the entire system repeatedly and changed the thermostat, he's also had a sniff test done twice to see if the head gaskets have gone and they both had negative readings for exhaust fumes. Has any body come across this before? The other engine had not overheated before so there was no cooling system issues before this engine. There's a new water pump going in today just in case the impeller is spinning on the shaft under load.
I've posted pics below of the engine just in case anyone can spot something obvious that has gone back out of place or has been swapped.
Cheers, Shane and Toby