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MG TD TF 1500 - Cylinder head

I have problems with a cylinder head on an otherwise untouched and original 1250-engined MG YB. We are getting oil into the cooling system, and have traced the source to the rear cover of the cylinder head. My question is : should there be a brass blanking plug in the oily, or is it normally only sealed with the gasket between the head and the rectangular rear cover ?
Dominic Clancy


Good day Dominic. My heads have a slotted screw in the oil gallery.


Butch
R Taras

Should be plugged
W A Chasser

Agreed, threaded plug, slotted.
Steve Simmons

I would pull the rear cover and see if the blanking plug (brass) is still in place, although I must say that it is VERY strange that it somehow unscrewed on its own, in an un-touched engine. Usually that problem occurs only after a rebuild!

I also sell nice stainless steel rear cover plates - see mgtrepair.net

If the plug is in place still, look for a blown head gasket.

Tom Lange
MGT Repair

t lange

That was the information I needed, thanks to all who replied.

The head was just treated to a complete rebuild and unleaded conversion because the valve guides were worn and the engine was smoking a lot when idling. The rebuilder seems to have forgotten to replace the plug before sending the head back to me. I made a plug this morning, and we have refitted the head, rinsed out the cooling system fifteen times to get clear coolant again, and changed the oil again. Now everything seems to be fine.

Dominic
Dominic Clancy

Lesson learned: Don't rust anybody to do their jobs completely right.
MAndrus

The "otherwise untouched and original" statement led me to think that nothing had been done to the engine. Now I see that the head had been removed.

Tom Lange
MGT Repair
t lange

This thread was discussed between 13/04/2017 and 14/04/2017

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