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#1432746 Wed Dec 08 2021 03:40 AM
Joined: Dec 2020
Posts: 70
I am rebuilding my 59 235 after it came back from the machine shop. I have searched several times in the manuals but I have not found the piston pin rod bolt torque spec. I can go with the normal 3/8 fine thread torque standard but I would like to know what the Chevy spec is. I found the mains, rods, and head bolt torque but the piston pin I have not found. It would be nice if someone that has that type of info would put it on a spec sheet and sell/market all the torque specs for the old AD trucks. I would buy it smile My truck is a 47 3600 but it had this 59 235 in it when I bought it. It sat for 40 some odd years and was stuck tight.

Joined: Feb 2004
Posts: 24,558
Kettle Custodian (pot stirrer)
It's a 3/8-24 bolt. 30-35 ft/lbs is about right. Be sure to support the wrist pin by clamping a tapered punch in a vise and slide the pin over it to avoid twisting the I beam section of the rod while torquing the bolt. Back when these engines were built, mechanics were assumed to have some common sense.

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Joined: Dec 2020
Posts: 70
Thanks, Jerry. I knew enough to support the wrist pin when tightening it, but a good reminder is always welcome.

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