Vehicle & Technical > Range Rover

RRC V8 overheating

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meathumper:
Hello all, Ive got a range rover 3.9 which blew a head gasket, so i got the heads skimmed, they dident need doing as they were straight, but got them done just incase, changed the gaskets and put it all back together. Then to find i was getting exess pressure in the water system. So off come the heads again with all intentions of changing them. On looking in the engine bay at the block we noticed a mark (pitting) on the block on the left hand side, in between the water way and the cylinder. So after seeing this we then thought its not the heads its the block. So out come the block and that was skimmed to, also put in a new cam, timing gears & chain, lifters, bigend and main bearings Then all back together again. Once all together started it up and went for a drive and still exess pressure, so i bought a chemical test kit to test the coolant of cylinder gasses and sure enough gasses pressent. Now the last resort i suspect damaged liner so in went the Ironite, went for a drive today and i dont think its cracked it. But now im over heating. Eny ideas please? And no i dont want to scrap it, or burn it out. :'(

Range Rover Blues:
You've obvioulsy spent a lot of cash on it by now.  It's overheating, so assuming it's not an external cause then the most likely culprits are air locks and pressurisation.

If you suspect it's pressurising then I'd sugest a blow down tester, but these are £100 or thereabouts if you can't hire one, try E-Bay.

You've tried Irontight which tend to make me wonder if it's a cracked block, the reason cracked blocks cause probelms is that the liners can then slip, if the liners had slipped you would have noticed when it was in peices.

So, is it using water? is it blowing out of the header tank and are you sure it wasn't just an airlock (the V8 is hard to fill up with water).

meathumper:
Hi thanks for reply, It was useing water when the gasket went the first time then after new gaskets in it was pressurising and blowing out the header tank, i first hoped it was air locks but after lots and lots of bleeding it would still pressurise after about 12 miles. Thats why i thought it was a crack as it was only doing it after 10-12 miles. Crack was opening just enough to let compression gasses through but not the other way round. I bought a combustion leak tester that is put on the rad and the fluid changes from blue to yellow if combustion gas is pressent and it was possitive

Range Rover Blues:
So it's just a matterof where :-k

Did you use composite gaskets? on the heads.

I'm thinking that you might be best getting another engine, I know you've chucked piles of cash at this one but if there is ablockissue and IronTight hasn't done it then it's past saving.

meathumper:
Yes composite gaskets from real steal. The irontite Has fixed the over pressuring problem but has give me a over heating problem now.

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