VB PROBLEM and Solution
I said I'd share and experience I had during a VB rebuild.
I had gone around the block cleaning and rebuilding a used valve body bore by bore, and when I came around to the last one I neded to do, the BOOST valve, which I definitely planned to upgrade, it was stuck. I mean it moved in it's range of travel "ok", but when I removed the keeper it would start to come out and then stick. DAMN. The ONE bore I think is important to upgrade.
So I fiddled, played nursed, coaxed. Nada.
I left it overnight and did it again. Nada.
It then struck me, maybe when I was cleaning off the very stuck on gasket with the razor blade a piece of gasket material got down into the bore and was causing the sticking. So I turned it upside down (again) and using brake cleaner did my best. No help.
Finally I decided either I was going to fix this, or use this VB for parts. SO..... I drilled a hole in the end of the boost valve (since it was being replaced anyway) and screwed a screw into it..... then I put some vice grips in the screw at right angles so I could smack the side of em with a hammer.... did it work? Not at first but once I got a big enough hammer it did. Did I find any gasket ? no. (I still think that might have played a role and is a good precautionary tale as I got serious about checking and did pull out some pieces elsewhere that might have caused future problems.
Here is the removed valve
So, the bore appeared ok, and since the new one was using O rings I wasn't worried.... went to install it and ....NOPE.....would not go in, the bore was out of round!
The sealing rings are pretty far down the bore, soo, I decided to ream it back to round...I gotta tell you my set of adjustable reamers has saved the day more than once.... so I reamed it...
and didn't go very deep into the bore .. the eccentricity was outboard mainly
And (you didn't see this here!) then I burnished and polished the reamed portion using 600 grit paper... (ordinarily this would be a no no but since this is outboard of the sealing area and I am using O rings in any event I felt it was ok...)
The new valve, post reaming? Fits just fine. Problem solved.
DO BE CAREFUL about getting gasket scraps into the old body.
Was the bore out of round before I removed the valve using brute force? I have no idea. Was it gasket material that caused the problem? I have no idea but suspect it played a role. Anyway, if someone encounters a similar problem, now you have one more idea to try.