Re: RD-17 crank defects—-

[jethro]

Thanks everybody for the guidance—
i found on-line someones photobucket page that had a condensed maintenance manual that gave torques and clearances.
The total variation on the mains is .0005 and I am about .001 to .0015 small now. That may be small enough that it could move
enough to bump against the rollers and deform them (not sure how much I can get away with.) I may still try the titanium putty.
I may- as an experiment- try sandblasting the zone just outboard of the rollers but under the seal— to try to make the putty adhere….

I remember that aircraft cylinder barrels are routinely re-chromed on the insides to oversize and then hoaned back down to spec diammeter
so that nominal size rings and pistons can be used. I am wondering if that could be done to a crank ? It is a "hard chrome" process
which does not use soft copper and nickel layers underneath. It is also called "channel chrome" because as it is going on- it naturaly has
a convoluted surface (microscopicly) which tends to hold oil (so I understand). So I suppose it would have to be ground or lapped for a
needle bearing to run on maybe……
perhaps I can do some googleing on that…..

Let you know if I discover anything on that……

Otherwise i will be check with Dan Gano to see if he has cranks…..

Tim