The cylinders from my 320 have all suffered from corrosion in the bores, 2 have honed within limits and the corrosion is removed, however the other 2 need to be ground .010 oversize, and given I can't see any point in having half the cylinders at a larger bore than the others I'll either replace all 4 or bore all 4.
Given I live at the bottom of the earth there is only 1 (certified) shop in the country that can do the work, naturally they know how to charge. I'm told they remove the head from the cylinder to do the job.
I have also been introduced to another local shop that does certified work on other aircraft engines (so they must have some process and QC in what they do), who tell me they are able to bore my cylinders without removing the heads (non certified of course as they work on vintage engines). Their charges are more reasonable.
So the question really is: Is removing of the head a universal part of boring Lycoming cylinders oversize, or is it something that some shops do and some not? I've no doubt the latter shop can do a good job, but what is normal practice stateside for this job?
Thanks!
Given I live at the bottom of the earth there is only 1 (certified) shop in the country that can do the work, naturally they know how to charge. I'm told they remove the head from the cylinder to do the job.
I have also been introduced to another local shop that does certified work on other aircraft engines (so they must have some process and QC in what they do), who tell me they are able to bore my cylinders without removing the heads (non certified of course as they work on vintage engines). Their charges are more reasonable.
So the question really is: Is removing of the head a universal part of boring Lycoming cylinders oversize, or is it something that some shops do and some not? I've no doubt the latter shop can do a good job, but what is normal practice stateside for this job?
Thanks!