Franklin 165 Crankshaft

Technical Questions about the Stinson, flying the Stinson, and maintaining the Stinson

Franklin 165 Crankshaft

Postby BobYoung » Fri Aug 26, 2011 11:42 pm

Someone enlighten me on the 165 crankshaft. What is the maximum that it can be ground? .010, 020? That question may be moot if the magnaflux comes back bad, but the TC on lycoming is a maximum of .010, but don't know about the Franklin.
BobYoung
 
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Re: Franklin 165 Crankshaft

Postby lawheelock » Sat Aug 27, 2011 2:39 pm

Bob,
The Franklion Crankshaft can be legally ground to -0.020". As I recall, this is in one of the manuals that anyone working on a Franklin should have as all are available from Univair. In the parts manual you will find part numbers for -0.020 bearings. Finding the bearings may be another matter.
The crank must be ground undersize by an aircraft crank servicing company that correctly grinds the radii on the journals. An uncertified automotive shop is not acceptable. A 165, 180, or 220 crank can be used in a 150,165, 180, or 220 engine. But, even though it fits perfectly, a 150 crank cannot be used in a 165 or larger engine because they were not originally nitrided, but shot peened.
Larry Wheelock
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Re: Franklin 165 Crankshaft

Postby BobYoung » Sat Aug 27, 2011 2:54 pm

Thanks, Larry! I have the manuals, but didn't look hard enough, I guess. Don't know about cost of (over)(under)size bearings on the Franklin, but for the TCM GO-300, I know the cost was outrageous. The reason I was asking, is because I have a spare 165 engine that I know has been ground to 0.010, not too many hours ago, but was involved in a minor prop strike. I'm in the process of dissassembling. If the crank is obviously bad, I'll just forget it, but if it looks good from a cursory examination, I'll send it off for official inspection.
BobYoung
 
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Re: Franklin 165 Crankshaft

Postby lawheelock » Sat Aug 27, 2011 4:13 pm

Bob,
I am pretty sure that a TCM GO-300 will have much higher costs than a regular O-300 because of the obsolesence and the many problems the engine had due to operators not wanting to run it fast enough.
Susan would be the best to ask about availability and prices of bearings.
Larry
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