Engine Builder Advice
 

Hi all,
First time caller, long time...well you know. I'm in the process of starting a rebuild
of my 83 911 SC. Motor is out. This started as just fixing some leaks. But, since I have it out I might as well do what I think is needed. Engine has 136k miles. Ran strong with no smoking. All heade studs intact. Has Kloberschmidt Alusil cylinders.

Trying to get some input on what I should do with cylinders. I want to reuse them. Either leave them alone with pistons removed with cylinders, (no re-ringing), or remove and have them reconditioned after being checked, by someone familiar with Sunnen honing procedure for Alusil cylinders. Or have them plated with Nikasil? Thanks. Been obsessing about this for a week or so. Need to make a decision.

Where are the leaks coming from?
Do you have to break the engine down to repair the leaks?

Yeah Bill, cam seals, front and rear main seals and possibly 2 case through bolts...and oil cooler.

Old trick with airplane engines to help seal them.....
After putting the 574 or whatever sealer on the case halves...run a silk thread along the flange (leaving it stuck in the goo).
This helps to seal some cases...because the roughness of the flange can sometimes allow leaks.
Bob

If it was coming apart I would do the head studs. It would suck to get it back together just to find a broken stud during the first valve adjustment.
Oh, and while your in there......