C85 checking for corrosion

DFH65

DFH65

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DFH65
is there anyway to look for corrosion? Obviously you can borescope the cylinders. Is there any way to check out the bottom end without pulling a cylinder?
 
DFH65 said:
is there anyway to look for corrosion? Obviously you can borescope the cylinders. Is there any way to check out the bottom end without pulling a cylinder?
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in short - no .

Is this a tapered shaft, or flanged? Corrosion forward of the nose seal is very serious in these little Continental engines.
 
Not sure but when I find out what is preferable? And which is which?
 
Another question in addition to the above.
Logbook says:
Major overhaul...crankshaft reground .010 cylinders reground +.015

Assuming they were still serviceable would they still have another "regrinding" in them? Or would they need to be chromed? or other? at the next overhaul.
 
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DFH65 said:
Another question in addition to the above.
Logbook says:
Major overhaul...crankshaft reground to .010 cylinders reground +.015

Assuming they were still serviceable would they still have another "regrinding" in them? Or would they need to be chromed? or other? at the next overhaul.
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.010" under is all you can do with out using Superior's STC to go .020".
(I don't know if this STC applies to the C-85)
Plus .015" is as large as you can go, there are no + .020 Pistons.
There is a 0-200 upgrade STC, which get's you a 0-200 crank, and cylinders, and a major case alteration.
 
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So does that mean when this thing needs to be rebuilt it will need a crank and all new cylinders? Or is there another way to refurbish them? Say chrome or other at a reasonable cost? As I mentioned in another thread possibly buying this plane engine is an old rebuild. Hoping to fly it a bunch since it at least seems to be running well now but thinking of the future when I need to rebuild it is it going to cost me a ton more than it otherwise would.

On the other hand if the parts aren't serviceable all the more reason to run it as much as possible.
 
DFH65 said:
So does that mean when this thing needs to be rebuilt it will need a crank and all new cylinders? Or is there another way to refurbish them? Say chrome or other at a reasonable cost? As I mentioned in another thread possibly buying this plane engine is an old rebuild. Hoping to fly it a bunch since it at least seems to be running well now but thinking of the future when I need to rebuild it is it going to cost me a ton more than it otherwise would.

On the other hand if the parts aren't serviceable all the more reason to run it as much as possible.
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It may run for ever, You just never know.
Most of these old engines you'll not salvage much on re-build. Owners simply repair and keep them running and never actually overhaul to rebuilt standards.
 
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