Corrosion Inspection

[chepburn]

Hi all,
I am looking for advice on ways to inspect for corrosion in an engine that has been idle for years (but in a dry environment, and properly pickled initially) On an IO-360 A1B, is there any other places to try for internal access with a borescope other than removing a jug?

Same for the accessory case...
From what I have been able to look at so far, there is no 'apparent' corrosion.
BTW, I fully expect that a complete teardown will be required, I am just looking at 'quick' ways to triage the engine before it is sent off to an expert.

Chris

[CESSNADON]

You could drop the oil sump and with a bright light and a mirror you should be able to inspect the cam. It would probably be less work to remove a cylinder..
Removing the mags should give you a view of the accessory case gears. You can borescope the cylinders through the sparkplug hole.

The cam and the lifters are the most prone to damaging corrosion and corrosion on the accessory gears can cause stress risers and lost teeth.

If the engine has been out of service for some time there are probably service bulletins and AD's that need to be complied with.


good luck.