Reply With Quotejust to correct that,its 11 bar and 7 bar, not 1.1 and 0.7Originally Posted by scoop2004
compression test results. Fine or dead?
Comp tested the 520 this morning,here are the results
Cyl 1 1.1 bar average and holds
Cyl 2 1.1 bar average and holds
Cyl 3 1.1 bar average and holds
Cyl 4 0.7 bar average and holds
Cyl 5 1.1 bar average and holds
Cyl 6 1.1 bar average and holds
Whats up with cylinder 4?? its not leaking but its down on pressure.
What would make this happen,will it be an expensive fix?? reason i tested it is down to water pump failure to check i havent warped/cracked the head
Sig car has gone, but buying an E34 on my return to Britain in 3 months
just to correct that,its 11 bar and 7 bar, not 1.1 and 0.7
Sig car has gone, but buying an E34 on my return to Britain in 3 months
Green Beret Special Ops
thats a big drop there, to check if it is rings add a couple tablespoons transmission fluid and re-check. If it goes back up than rings, if not generally its valves. If the valve lash is way off that could cause it too.
Good luck!
95 E34 530I V2.37
===========
Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
a)what is valve lash
b)ill try what you have suggested re the rings
c)can i add that when i stop cranking it it HOLDS 7 bar,it doesnt lose the pressure.
d)would using 98 octane fuel,red-ex and intake cleaner help rasie it a bit (if its down to dirty/stuck valves
e)if its head gasket how much will it cost to buy all the parts needed to change it (DIY)
Sig car has gone, but buying an E34 on my return to Britain in 3 months
Major Contributor
It's the amount of free clearance between the cam lobe and the valve stem (via the rocker arm) when the lobe is at its lowest point. In the M50 engine, this is not adjustable.
You'll need at least a head gasket, head bolts, intake manifold seals, exhaust manifold gaskets, valve cover gaskets, and possibly shaving the head if the surface is poor or slightly warped. You can price the parts at http://www.eurocarparts.com, and you can usually get a head gasket set that will include all the necessary seals and gaskets. You'll need a torque wrench if you don't have one.
Last edited by DaveVoorhis; 10-21-2006 at 10:55 AM.
1997 535i V8
5spd, OBC, A/C, cruise, BMW phone, factory M-Tech wheel & suspension, 18" Alpinas
If its rings how hard is it to change the rings,whats involved briefly?
Can u just remove sump,disconnect rod,drop piston,change ring,re-fit piston,reconnect and refit sump???
If its valves then how hard/cost to change,whats involved briefly
This sounds like its gonna cost more than its worth to get it running.
Would the car be roadworthy with this low compression??
Sig car has gone, but buying an E34 on my return to Britain in 3 months
Big Time Poster
it's probably been driven several thousand miles with the compression as is. put it back together, keep an eye on the coolant level and temps and pretend you never noticed that cylinder, don't beat the car up too hard. thats what I'd do.
................then when it goes bang break it for spares and buy an E36 325!
i like ur thinking mate
Or maybe ill get an E39 530. Wasnt gonna keep the 34 long anyway as its pretty rough
Sig car has gone, but buying an E34 on my return to Britain in 3 months
Green Beret Special Ops
you can only replace the rings by taking the piston/rod out the top of the engine..ie: remove head too.
95 E34 530I V2.37
===========
Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
Big Time Poster
If I'm calculating that acurately, 11 bar is about 160psi (bar x 14.5), which is quite low. Mine read about 220 to 230 psi (or roughly 15 bar).
Your 11 bar is right at the minimum.
Is it low on power? Burning oil? (blue smoke out of the exhaust).
Stu.
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