Need help on pony motor rod bearing torque

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daves2035

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Hi, I am assembling a pony motor on a D2. I started to install the rod caps, the torque spec is 58 ft pounds on 5/16 bolts. When torquing the bolts it seems not to bottom out. I have 30 ft pounds on so far. I am afraid that they may break. Has any one come across this.Looking for help.Are they available yet if they break? Thanks

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Mon, Sep 26, 2011 3:34 AM

Old Magnet

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That's way to high for a 5/16 thread. Where did you obtain that spec?
Your 58 ft. lbs. is more in line with main engine rod torque. I don't recall seeing a pony rod bolt spec in the Cat literature.

http://engineershandbook.com/Tables/torque.htm

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Mon, Sep 26, 2011 4:30 AM

Mike Meyer

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Reply to Old Magnet:

That's way to high for a 5/16 thread. Where did you obtain that spec?
Your 58 ft. lbs. is more in line with main engine rod torque. I don't recall seeing a pony rod bolt spec in the Cat literature.

http://engineershandbook.com/Tables/torque.htm

I'm pretty certain those pilot motor conrod nuts only get tightened to 14 foot pounds, the heads are 25 pounds from memory.
regards
Mike

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Mon, Sep 26, 2011 4:56 AM

daves2035

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Reply to Mike Meyer:

I'm pretty certain those pilot motor conrod nuts only get tightened to 14 foot pounds, the heads are 25 pounds from memory.
regards
Mike

Thanks guys for the help

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Mon, Sep 26, 2011 5:15 AM

64farmboy

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Reply to daves2035:

Thanks guys for the help

Yep, main rods on a D2 are 58 ft lbs

Regards Dennie

Restored 1970 ford tractor,1931 Model A PU streetrod, lifted 1978 F150, 1971 VW bug, antique chain saws

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Mon, Sep 26, 2011 5:24 AM

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