Emergency request: Flywheel bolt info
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Junior User
Joined: May 2006
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Emergency request: Flywheel bolt info
I am in the process of replacing the 460 gasoline engine in my '86 F350 (4x4 w/ 4 speed manual tran.) with a 6.9 diesel. I needed to change the flywheel since the diesel came from an automatic. I just discovered that the manual flywheel is about 1/4 in. thicker than the auto flexplate. The flex plate bolts I have are 3/8ths x 1&7/8ths coarse thread. I thought that I could just purchase regular grade 8 bolts (3/8ths x 2&1/4 coarse thread) however the maximum torque specification for these bolts is 44 ftlbs. This is far below the 75-85 ftlbs flywheel bolt torque specification I was given.
I am trying to reconcile the difference. Does this mean that the flywheel bolts are different than the grade 8 standard and that I must use only the factory flywheel bolts? Or is there an error in the flywheel bolt spec. I have. Does anyone know where I can get the correct bolts? The Ford dealer no longer lists this part in its system.
I am trying to reconcile the difference. Does this mean that the flywheel bolts are different than the grade 8 standard and that I must use only the factory flywheel bolts? Or is there an error in the flywheel bolt spec. I have. Does anyone know where I can get the correct bolts? The Ford dealer no longer lists this part in its system.
Check with ARP.
Junior User
Joined: Jun 2005
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This may or may not help:
I needed new flexplate bolts for a remanned 351W I put in my truck. At NAPA I believe I found the bolts in the HELP! line of stuff (I could be wrong about the brand, but it was definitly in a NAPA store). Funny thing, they said they were for GM application, but they were the same size. Black oxide bolts (not sure about grade), and yes, they torque to in the 70s or 80s ft/lbs.
I needed new flexplate bolts for a remanned 351W I put in my truck. At NAPA I believe I found the bolts in the HELP! line of stuff (I could be wrong about the brand, but it was definitly in a NAPA store). Funny thing, they said they were for GM application, but they were the same size. Black oxide bolts (not sure about grade), and yes, they torque to in the 70s or 80s ft/lbs.
Freshman User
Joined: Nov 2006
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Hey, the best way is to go to a junk yard and get the proper bolts, I just swapped out an auto and put in a four speed standard on my 86 f150. I went to the local yard and took out a flywheel and used the bolts that were with it. Also you can buy new bolts from LMC truck, at LMCtruck.com.. they come in 3/4 or 1 inch, it sounds like you need the 1 inch....
Also, they are a special bolt and I don't think I would put regular bolts in....
Also, they are a special bolt and I don't think I would put regular bolts in....
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