Originally posted by jscamry
lol its funny how taylor and amg were speaking about the tinking sound ffrom the engines, that were pinched by osrocket my mt12 that I just had done is doing th e same thing, so this is ok? I have had some other engines worked by osrocket but those did not make the same sound it my memory serves me.
I just don't know. My ozrocket pinched sleeves were all 4mm top spacing and if I recall, a new Nova P/S set is usually about 3.5mm - could be wrong here.
With the persistant "tinking" I just thought I wasn't getting anywhere and probably doing more harm than good. When the rear bearing failed, that decided it for me. Remember too, that this was a X/12 Rody - rather marginal in the crank strength department.
The other thing going through my mind was that a new P/S set has the fresh hone cross hatch that gets polished during the break in. The pinched sleeves were still polished from previous running and weren't going to be helping that situation.
My theory with the bath cleaner was to create a roughened surface that would bed in correctly, reduce the diameter of the piston to lessen the pinch point and also eliminate any out of round situation that may have resulted from the pinching procedure. It may be a bit crude, but seems to have worked OK.
I should also mention that I e-mailed ozrocket my concerns re the 4mm pinch point and he said it was correct and would be fine. Plenty of people swear by his method so I may have been over cautious. I'd use ozrocket again, too, and probably still use the bath cleaner.