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The mkiv Supra Owners Club

Head rebuild time?


Homer

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I changed the cam gaskets today, but after removing the cam covers I was shocked by the condition inside. There was burnt on oil and gunk on almost every surface, in fact the inside looked dirtier than the outside of the engine! The gunk inside the cam cover was so badly burnt on that even scratching it with a screwdriver it was tough to remove.

 

Since buying the car I've always changed the oil regularly and apart form the 1st change have used silkolene, last change was only 1500 miles ago. When I got the car from Paul E all fluids needed changing (I mean everything), most was like treacle. I can only guess the gunk has been caused by poor maintenance before I bought it.

 

What do you guys think of the state of this (see pics)? Dash Rendar had a similar post a few weeks ago (Though his was worse than this) and went to the trouble of having the head rebuilt!

Cam1.jpg

cam2.jpg

cam4.jpg

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it looks pretty simalar to mine when i took the head off to do the valve stem seals, the key to all the gunk is it will stay put as long as you leave it alone, start trying to scrape at it and your going to have nasty lumps in the system just ready to block your turbo oil feeds up, i suggest you put the cam covers back on and step away from the head :eyebrows: nothing to see move along please:eyebrows:

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Cheers guys, thats a relief too hear!

 

Regarding cleaning it, thanks to previous posts here I knew not to try and clean up the cr*p. I only cleaned around the oil filler area and the surface where the gasket joins to the head. I didn't touch any of the stuff on the cams or inside the cam cover so shouldn't have disturbed anything (hopefully!)

 

Its all back together now, no more leaking oil and after a 20 minutes drive everything seems to be working fine :)

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I looked into the oil filler cap on the engine I used on my TT swapped NA and it looks pretty filthy. Anyways I am probably going to change the valve stem seals, water pump etc so I was thinking I ll take apart the head and get it cleaned while i get that done. Would it be necessary to replace the valve guides or any other part while the head is out?

 

thanks

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That's not too bad, BAD is when the cam lobes have gouged a groove in sludge that can be flaked out with a spoon, and so much is in the sump the oil strainer for the oil pump is choked and the oil system can't pump oil. Anyone who remembers when PCV systems first appeared, and the oil hadn't caught up with the new loads being put upon it, will know just what I mean. Fords CVH engine was a clasic for this happening to it.

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