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Mr. Bill

Flywheel Nut Torque 675

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I cannot find anywhere on the internet the specifications for torque for the flywheel nuts. Also, can the safety wires be replaced with cotter keys with no ill effects? This is a 1969 R600 with 5 speed and 675 engine. Can anyone help?

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I cannot find anywhere on the internet the specifications for torque for the flywheel nuts. Also, can the safety wires be replaced with cotter keys with no ill effects? This is a 1969 R600 with 5 speed and 675 engine. Can anyone help?

My Mack manual from that era shows 150 to 175 ft lbs torque on the flywheel nuts.

Start at the low limit (150) then tighten til the cotter pin hole in the nut aligns with the hole in the stud.

Do not exceed the upper limit (175).

Cotter pins are OK, I've seen them used before on that application.

I would also suggest using Loctite.

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