I would like to check the compression on my V12, but have never accessed the spark plugs (just purchased this car <$1k and it doesn't run). I have downloaded Kirbys "Experience in a Book" .pdf, and have searched for "accessing the V". I cannot find what page this is on. Has anyone done a write up, or have photos? I'm not sure what is the best order to remove things, or any other tips. What should my compression numbers be on an 88 V12? Thank you!

 

Here you go, this is what you are looking for.


Accessing the Vee


Basically, cruise control out, compressor out, throttle pedestal (by far the trickiest part) out - take of the stupid bracket when you do this and in the future and it will be much easier. Consistency between cylinders is the real key to smooth running - anywhere between 200-220 psi is dandy (warm no oil in cylinders).

 

Right on. I had pretty good success with a little, short, open end wrench to get the back bolts out of the throttle pedestal. The bolt toward the passenger side in the back is the one I had trouble with. The rest of the stuff is pretty straightforward. Once everything is out of the way, plugs are easy to get to! (passenger side meaning right side US)

 

If you slot the backholes in the throttle pedestal it will make it easier to get it back on and off again.

Also remember to compression test with throttles wide open if you don't the cylinder will not fill and will give a lower pressure reading.