2001 D2, 4.0.

I've fixed every oil leak on the thing and was using 2qt/60 miles or so. Also was getting misfires on cyl7....plug fouling. Oil. No real smoking unless I really stomped it. Head gaskets done about 20k miles ago.

Anywho....cylinder 7 has a bad ring. Now...it still has great compression. Around 160psi, as do the other 7 cylinders. I'm thinking I can pop the head off, drop the pan, and slip #7 out, re-ring it, and slip it back in. I'd probably do all the rod bearings while it was apart too.

Thoughts?

Dropped a bore-scope into the cylinder for confirmation.

 

Side note, I've never seen a stuck ring cause low compression. I suppose it could happen.

2 qts every 60 miles is crazy! Your plan sounds good to me though. I can tell by your car list, and your strap-on er...snap-on tool you kinda know what your doing at least!

 

Haha, I try. I know those BMWs in and out. The Rover is, kinda, a different animal....although I learned by doing on all those cars in my sig.

Also I work at an indie Euro shop specializing in German cars.....hence the Snap On goodies. Shop tools, lol.

Hopefully this week I can get this thing torn down for exploratory reasons. Planning for the worst. ....mostly because I wanna work on the SIII 109 I got a few months ago.

 

have you checked the valve guide seals on number 7?

 

They were replaced when the headgaskets were done 20k ago.

Of course nothing is ruled out until I get into it....