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8.1 Main bolt torque

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Joined: 26 Aug 2014
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PostPosted: Tue Jan 02, 2018 6:00 pm    Post subject: 8.1 Main bolt torque Reply to specific post Reply with quote

I ordered new main bolts and the head is different than my old bolts. Part number is R519287. My manual says 50 ft lbs then 170 ft lbs. Old bolts are 15/16 head with 180 stamped on the top. New bolts are 3/4 head with metallic no reuse. Is the torque spec the same with the new bolts? Serial number is after 200,000. Thank you
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Joined: 20 Apr 2014
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PostPosted: Fri Jan 05, 2018 1:23 pm    Post subject: Re: 8.1 Main bolt torque Reply to specific post Reply with quote

according to my tech manual initial is 50 then to 170 ftlbs, i rebuilt an 8.1 with a debonded piston last year in a combine and it runs great still so if there from deere they should follow the manual
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