Vehicle & Technical > Range Rover
3.9 V8 Auto overheating
TDi90:
buddy,
first hi and welcome!
second, changing the thermostat is easy, if its anything like my TDi. (its prob not, but cant be that muchdifferent?)
just look in the haynes, find the thermostat, then undo the bolts (there were 3 on my 200TDi) then take the top bit off, underneath you will find sitting there the thermostat.
just replace this, and rememebr to get a new gasket to seal the unit back up again. they are cheap as chips, i think 20p for the gasket and a thermostat definately not more then £4-£5 quid.
HTH Rob
bezzabsa:
thought radweld wasnt supposed to be used on ally engines?? or is this just a myth?
Skibum346:
Mick,
I'm kicking myself... was in SWMBO's 3.9 RRC today giving it a service and I could have taken some good pics for you! It should be in the haynes and it really is dead easy, if a bit fiddly putting bolts back in... Check Haynes and if you need more help I can arrange some pics.
Skibum
Range Rover Blues:
Haynes is really usefull for the RRC, and useless for the Disco.
A head set (top end set in fact) will cost you less than £40 from Paddocks or Rimmers. Get the composite one though.
The composite one is far more reliable but thicker, 1.2mm as opposed to 0.5mm for the aluminum gasket. If you skim the heads (and I suggest you do) then you can take up to 0.7mm off without raising the CR.
On the front of the off side (driver's) head and back of the NS you should see a small square peg facing forwards with a hole in it, for no logical reason. The bottom face is on the head face, so when you skim the head the hole moves nearer the face than the side of the peg, this is why it's there. It's a tell-tale.
Use a good thread lock on the head bolts, not copper slip. Take your time and you should be ok.
HOWEVER, is the chuffing coming from the exhaust or the head? well if you can't decide try this, once you've got the eaxhaust manifold off, start it up, if it still chuffs it's the head gasket.
If the head gasket has gone I'd put money on you needing the head skimming. Overheating is often the cause, which brings us back to your original question and something that needs sorting before you spend wads of cash on doing the engine up.
pacman:
How did you get on with this? I had serious problems with my RRC last year, replaced all the cheap bits first, such as thermostat, water pump...then changed head gaskets.....in the end it was a dodgy radiator. When I removed my old radiator there was an entire forest of dead leaves, twigs, flies etc wedged in between my radiator and air con radiator. Once I hosed it down it disintegrated! One new radiator later and now everything is hunky dory!
That is until my heater matrix went on me....now that IS a nasty job to do!!
--
Thanks
Paul
1992 RR Vogue SE
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