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Old 10-10-2019, 08:51 AM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 529

That post was so long ago, I couldn't remember my reasoning...
I've r&r'd probably 8 props for overhaul & Murphy with out fail positions the 6 spinner holes just that bit out of phase, close enough that I wouldn't be able to drill new holes & install nutplates in the bulkhead My solution as described is to reposition the front bulkhead so I have lots of virgin flange to drill new holes & nutplates.
As for elongating the 4 center mount holes, I've seen the damage from cracked spinner bulkheads... cost a set of blades on one plane.
Maintain lots, upgraded - repaired - & modified more, rebuild a few, & built some too.
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Old 10-10-2019, 11:18 AM
von_flyer von_flyer is offline
Join Date: Oct 2014
Location: Metamora, Michigan
Posts: 175

Just went through this a couple months ago when I had the prop seals replaced and blades refinished. They stated the clocking of the front threaded holes may be different since they tighten the 'nut' to a torque and not a position. They showed me a Mooney front plate that has a large amount of rotation allowed by slotting the holes. I assume they have the plate in a mill with a rotating table to assure the slots are concentric to the center point. I had to slot mine perhaps 1/16".
John von Linsowe

Cessna 140
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Old 10-10-2019, 12:42 PM
cajunwings cajunwings is offline
Join Date: Jun 2007
Location: new iberia la
Posts: 641
Default Slotted bolt holes

Was very common for production planes to have a slotted front bulkhead. On the assembly line it could be rotated as needed to align and if you bought one as a replacement part you could just bolt it on.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
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