[Mk2] [Turbo] HEAD off again!!! Any ideas??????

[2barGee]

Car was mapped up ran fine for about 200 miles then started overheating......... looked in the oil cap and found this

http://i191.photobucket.com/albums/z211 ... 007518.jpg


So took the head off....



Hks 1.2 mm gasket fitted last time head was off......

http://i191.photobucket.com/albums/z211 ... 007509.jpg





only mark i could find is this,






No marks on the other side so i cannot see this been a crack in the block as it only looks like a small scratch.


and one of the head


http://i191.photobucket.com/albums/z211 ... -small.jpg

i am thinking maybe the head was not totally flat??

Any other ideas people??

thanks Dan

[Olly P]

Did you have the head skimmed last time?

[2barGee]

Did you have the head skimmed last time?

nope but it was pretty much perfect when we checked

[dai21t]

I had the head skimmed and the block decked when I fitted a steel headgasket. Maybe one or the other isn't perfectly flat with you?

[liamc]

Did you use new head bolts when putting it back together?
I dont know if the MR2 uses them, but most head bolts are a 1 use only.
Called Torque to Yield (TTY) bolts, and its a way of ensuring even clamping pressure across the head.

[Bender Unit]

Sorry to see your having problems Dan, seems very bizarre!

That scratch in the bore isnt anything to worry about, very common to see on a engine - its done by the piston rings. If the block was cracked it would be an obvious dark crack.

Are you getting any coolant leaks from maybe the rad, or the pipes running under the car? Maybe the rad is blocked?

How much are you using the car, short journeys at low speed can cause mayo on the filler cap which might be a red herring, making you think the HG gone when it isnt and the cooling issue is elsewhere?

Cheers

James

[Century Motorsport]

Dan Dan Dan!!!!!!

You HAVE to get the head skimmed! Those HKS gaskets are tricky at the best of times.... and thats with a head skim.

As i've said before, the head needs to be skimmed and it needs to be a nigh on glass finish in order for this gasket to seal.

Are there any witness marks across the head / head gasket? They may not be massivly obvious, but look very closely at it.

Nathan

[Century Motorsport]

I disagree on a crack being massivly obvious. Get some crack detector and go through the bores with a fine tooth combe with it. You dont want to be taking the head off once again...

Nathan

[Vindezal]

Not flat-across flats!

[2barGee]

bit of an update, i have had the head skimmed......at last

i have got a day off work this wednesday so i will let you know how it goes. I honestly think all my problems will now go!!!!

They better do, its been 1 thing after another!!!!