Need help on pony motor rod bearing torque

Showing 1 to 4 of 4 results

daves2035

Topic Author

Offline

Send a private message to daves2035

Posts: 16

Thank you received: 0

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

Please log in or create an account to join the conversation.

Mon, Sep 26, 2011 3:34 AM

Old Magnet

Offline

Send a private message to Old Magnet

Posts: 16,695

Thank you received: 17

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

Please log in or create an account to join the conversation.

Mon, Sep 26, 2011 4:30 AM

Mike Meyer

Offline

Member

Send a private message to Mike Meyer

Posts: 3,325

Thank you received: 4

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

Please log in or create an account to join the conversation.

Mon, Sep 26, 2011 4:56 AM

daves2035

Topic Author

Offline

Send a private message to daves2035

Posts: 16

Thank you received: 0

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

Please log in or create an account to join the conversation.

Mon, Sep 26, 2011 5:15 AM

64farmboy

Offline

Member

Send a private message to 64farmboy

Posts: 554

Thank you received: 0

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

Please log in or create an account to join the conversation.

Mon, Sep 26, 2011 5:24 AM

Showing 1 to 4 of 4 results

Upcoming Events

View Calendar

Need help on pony motor rod bearing torque

Follow Us on Social Media

Upcoming Events

10th Annual Best of the West

ACMOC Chapter 30 - Celebrating 100 Years of Caterpillar

Newby Hall Tractor Fest

High Weald Steam Working Weekend

Testimonials