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Old 03-25-2020, 07:25 PM
mandorfer mandorfer is offline
Join Date: Jun 2009
Location: Fort Valley, GA
Posts: 39
Default Help with tolerance for IO360 case studs

Help. I have looked in the table of limits and multiple IO-360 assembly manuals and I can't find the diameter tolerances on the long 0.500" studs (Lycoming 75154 or 72154) that pass through the case. Does anyone have a reference for that? I am about to reassembly the engine and want to make sure they are correct. Thanks.

Mike Andorfer
RV7 Finish Kit
2019 Donation
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Old 03-26-2020, 08:47 AM
flyinga flyinga is offline
Join Date: Dec 2007
Location: Fredericksburg, TX
Posts: 628

Have you tried searching SBs, SIs and SLs at
Jim Averett
TS36 - Silver Wings
Fredericksburg, TX
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Old 03-26-2020, 08:51 AM
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rocketbob rocketbob is offline
Join Date: Jun 2006
Location: 8I3
Posts: 3,449

I check the fit with a plug gage or use a thru bolt. If its not an interference fit I order oversize thrubolts.

Please don't PM me! Email only!

Bob Japundza CFI A&PIA
N673AC RV-7 borrowed horse
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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Old 03-26-2020, 09:20 AM
theduff theduff is offline
Join Date: Jan 2012
Location: Fallbrook Calif.
Posts: 244
Default Body-Fit Through Bolts

“Interference fit “ They need to go in solid if you can push them through by hand they’re too loose. I often have too use P-1 ( .001” oversized) through bolts in some locations with the center main ( 4 cylinder ) being the most critical. I watched an engine builder at a big name shop using a custom slide hammer to pull through bolts out of a recently built Lyc 4 cylinder. When queried the builder told me they can’t be too tight.
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