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  #1  
Old 05-05-2022, 01:20 AM
kjelle69's Avatar
kjelle69 kjelle69 is offline
 
Join Date: Aug 2011
Location: Sweden, 67?07′N 20?45′E
Posts: 73
Default O-360, Flywheel and prop extension installation

I am about to install the flywheel and Pacesetter 4" extension after an engine overhaul.

I've been looking through the SSP-1776-5 to see if there are any specific torque for the 1/2 inch extension bolts to the threaded inserts in the chrankshaft flange.

Is it good to go with the standard table for 1/2": 900 to 984 In.Lb. here or is it other specs here because of the dynamics due to rotation?
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RV-4. O-360A1D/180 with Pacesetter 200 Prop.
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  #2  
Old 05-05-2022, 07:12 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by kjelle69 View Post
I am about to install the flywheel and Pacesetter 4" extension after an engine overhaul.

I've been looking through the SSP-1776-5 to see if there are any specific torque for the 1/2 inch extension bolts to the threaded inserts in the chrankshaft flange.

Is it good to go with the standard table for 1/2": 900 to 984 In.Lb. here or is it other specs here because of the dynamics due to rotation?
I wouldn't go any higher unless using grade 8 or 9 bolts, and in that case looking at the specs for those bolts. That table is based upon milspec bolts (have no idea where these bolts sit in comparison to standard US bolt grading system though I speculate they are between grade 2 and grade 5) and going with higher torque runs the risk of streching the bolt long enough to compromise it's strength. You want a bolt to stretch enough to hold well, but if you go too far, it changes the structure and they don't hold well as they lose their elasticity which is what provides the holding power.

I don't know how close the torques in that table are to the fasteners max torque figures for the bolts you are using. Just know that each fastener has a limit.

Larry
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Last edited by lr172 : 05-05-2022 at 07:19 AM.
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  #3  
Old 05-05-2022, 07:54 AM
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kjelle69 kjelle69 is offline
 
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Location: Sweden, 67?07′N 20?45′E
Posts: 73
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These are the bolts that came with the Pacesetter extension kit. I intend to reuse them after cleaning and inspection. The marking is a C and an S on the head. (Carbon Steel ?)

I heard that a bit of blue loctite was recommended in some applications, since I have holes for a lock wire this wont be neccesary.
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RV-4. O-360A1D/180 with Pacesetter 200 Prop.

Last edited by kjelle69 : 05-05-2022 at 08:45 AM.
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