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  #1  
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
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  #2  
Old 03-26-2020, 08:47 AM
flyinga flyinga is offline
 
Join Date: Dec 2007
Location: Fredericksburg, TX
Posts: 628
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Have you tried searching SBs, SIs and SLs at www.lycoming.com?
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  #3  
Old 03-26-2020, 08:51 AM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,449
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I check the fit with a plug gage or use a thru bolt. If its not an interference fit I order oversize thrubolts.
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  #4  
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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