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Old Fogey UK

Please could someone tell me the correct torque wrench setting for final
tightening ?
Thank you.

1934_Hudson_8_Conv

Hello David,
initial tightening needs to be gradual so, it's best to torque each cap nut 3 or 4 times... progressively tighter. If you need the torque sequence, email me privately and I'll send it you you. After you run the engine 500 miles or 10-12 hours, you should re-torque the bolts again.

Make sure to use hardened nuts & no washers (no stainless!).
Jim

walts garage-53 · walts garage-53 February 2011 Posts: 1,470Platinum Member

Do not use those torque specs, as that is what the 48 to 56 308 cylinder heads take. Your 34 8 takes 3 steps, first 25, then 35 and last 50 foot pounds. Tighten any more and the stud will pull up and ruin the block. Let set between torquing. Hornets with 7/16 bolts take 65 and with 1/2 bolts or studs take 90 to 95. Walt.

1934_Hudson_8_Conv

Walt, thanks for jarring my memory! I need to go look at my Hudson Mech Proc manual to verify the final ft/lb number I used - it's been 5 years since I assembled my engine and I've obviously forgotten. Thanks for catching this! I would hate to hear that Dave stripped the studs out of the block.

Glad to see you're still on your toes!!!!

I do recall torquing very gradually and letting everything settle for 1/2 hour before retorqing.

Geoff C., N.Z.

Walt is correct. These old 8 cylinder blocks are not the most robust, and will certainly be destroyed if torqued down to 80. However, the most important thing is to torque in the correct sequence, when the engine is hot with cast iron heads. with alloy heads the tightening must only be done cold. The sequence is starting from the centre and radiating out evenly to front and back.

Old Fogey UK

Thanks everybody. I'll make sure I do it right now.

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