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  #1  
Old 01-20-2021, 06:51 AM
terry.mortimore terry.mortimore is offline
 
Join Date: Jul 2008
Location: Sault Ste Marie, Ontario Canada
Posts: 249
Default Idler gear shaft torque value

Hi gang:

I'm starting the reassembly of my IO-320 after Divco did the repairs to my crankcase. The 1/4" bolts that hold the Idler gear to the case wore the threads out.

Divco has installed a 5/16" stud and the other hole is a 5/16" bolt.

I've had this problem twice and I want to make darn sure I get it right when it goes together this time.

I want to ensure I have the proper torque value for the 5/16" nut and the 5/16" bolt.

I see Service Instruction 1197A and 1310A referenced for this area, but I can't find a copy of these instructions.


Can someone point me in the right direction?

Thanks, Terry.
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  #2  
Old 01-20-2021, 10:35 PM
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jcarne jcarne is offline
 
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Location: Worland, Wyoming
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I'm about to do this this weekend. I plan on torquing to 17 ft/lbs for the bolt. Most manuals I find use 12 ft/lbs for the slotted nut.

My engine shop uses lock plates and a non slotted nut so I'm going to double check with them but they might do 17 ft/lbs on both.

Sorry I can't find either of those documents. Too bad, I would like to read them.
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  #3  
Old 01-21-2021, 06:29 AM
terry.mortimore terry.mortimore is offline
 
Join Date: Jul 2008
Location: Sault Ste Marie, Ontario Canada
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Default Idler gear shaft torque value

Hi Jereme:

I spoke with Divco and they told me 17 lbs/ft for both. I also found a more current overhaul manual online yesterday and it says 17 lbs/ft on the bolt and 12 lbs/ft on the nut.

I did the deed last night. I used the 12 lbs/ft torque on the slotted nut.


Terry.
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  #4  
Old 01-21-2021, 08:45 AM
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jcarne jcarne is offline
 
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Quote:
Originally Posted by terry.mortimore View Post
Hi Jereme:

I spoke with Divco and they told me 17 lbs/ft for both. I also found a more current overhaul manual online yesterday and it says 17 lbs/ft on the bolt and 12 lbs/ft on the nut.

I did the deed last night. I used the 12 lbs/ft torque on the slotted nut.


Terry.
Nice! If I recall those are wet torques correct? I seem to recall my engine shop guy telling me they put a "tiny bit of lubriplate" on the threads first.
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  #5  
Old 01-22-2021, 07:55 AM
terry.mortimore terry.mortimore is offline
 
Join Date: Jul 2008
Location: Sault Ste Marie, Ontario Canada
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Default Idler gear shaft torque value

Quote:
Originally Posted by jcarne View Post
Nice! If I recall those are wet torques correct? I seem to recall my engine shop guy telling me they put a "tiny bit of lubriplate" on the threads first.
Hi Jereme, I believe that those are lubricated torque values. I can tell you that mine were well lubricated with Red Loctite!


Terry.
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  #6  
Old 01-22-2021, 08:46 AM
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jcarne jcarne is offline
 
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Quote:
Originally Posted by terry.mortimore View Post
Hi Jereme, I believe that those are lubricated torque values. I can tell you that mine were well lubricated with Red Loctite!


Terry.
Haha nice. Ya that's probably not a bad idea. It would be no good at all if one or both backed out somehow.
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