Vehicle & Technical > Discovery
chuffing V8
pas:
thanks for the replies guys
the readings are actually in PSI and so very low
yes its a 3.9 Block and have just spoken to a place that does head machining so they will have alook at the heads when I get them there
it get a bit complicated with my engine as its a 3.9 block with 3.5 heads that I gas flowed (they were skimmed a few years back) but with composite head gasket, I redid the rings about 6months ago so they should be ok, so as you can see I have no idea what the comp ratio will be. but I guess I'll find out tonight whats up when the heads come off.
cheers
Paul
pas:
the saga continues (along with my run of bad luck) I stripped the engine and didn't find any obvious signs of leakage but took the heads to be checked out and consequently skimmed (they needed 0.014" skim) so hopefully now they will be ok
BUT when I started to refit them today I managed to strip one of the threads in the block :cry: so now the question is can I helicoul the block and if so does anyone know what size the bolts are (as I don't have a guage)
cheers
Paul
Range Rover Blues:
Yes you can helicoil the block, don't know what size the bolts are though.
The 3.5 EFi heads are the same as 3.9 heads anyway.
I'd agree from those figures that you have a problem with the 3,5 and 7. Is that the LH bank by any chance? just where it went on RRR after dumping the coolant. That side of the engine runs hotter on some cars due to the way it's installed.
You can guestimate the new C:R given the following.
Tin gaskets are 0.5mm when intstalled, composite are 1.2mm
on the front of the driver's side head (back of the other head) there is a pointless square protrusion with a hole in the end of it. On a new head this hole is equidistant from the hasket face and the side of the 'lug'. As the head is skimmed it moves closer to the gasket face. Obvioulsy it can't be totaly acurate as you are machining the head because it has warped, so often the C:R in the outer cylinders rises more because the heads go concave.
pas:
cheers
i've now got a "Recoil" kit for this (its 7/16 UNC according to the rimmer brothers website for head bolts) just a pain that i've been able to get everything except a handle for the thread tap
Paul
BrumLee:
Paul, if you've got multi-sided sockets, not hex, you'll find one of them will fit the tap.
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