I have a 732i 1986 that has some motor problems.
Diagnosis so far:
Engine runs very rough
Changed all spark plugs, no change.
Checked compression on cold engine
1, 11.5 kg (approx. 165 psi)
2, 0 kg
3, 0 kg
4, 8.5 kg (approx. 125 psi)
5, 8 kg (approx. 120 psi)
6, 10,75(approx. 155 psi)
I'm thinking the head gasket is blown as there is no compression on 2
cylinders next to each other. When I look at specifications for BMW engines
it seems compression should be about 149 psi, so 2 of the cylinders are a
bit hi and the working two others are a bit low, could this be due to broken
piston rings? Allso I have no spec as to how much to tighten this spesific
engine, the book I have lists all other engine types, but I'm hoping I can
use the spec for 733i. Any thoughts on this, anyone?