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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

torquing connecting rod caps head bolts

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02-08-2018 16:14:16

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when one torques connecting rod caps or head bolts do you put some 5 weight oil on threads ? why is this done ? if not why do you leave them dry

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02-08-2018 22:20:47

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 Re: torquing connecting rod caps head bolts in reply to jim_uny, 02-08-2018 16:14:16  
will try again for better hyperlink to http://arp-bolts.com/p/FAQ.php

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02-08-2018 22:18:25

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 Re: torquing connecting rod caps head bolts in reply to jim_uny, 02-08-2018 16:14:16  
i found this on ARP-BOLTS.COM faqs section. i think they should knew

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02-08-2018 17:26:14

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 Re: torquing connecting rod caps head bolts in reply to jim_uny, 02-08-2018 16:14:16  
in the auto or engine industry thread torque is taken as clean and oiled. its pretty much torque values for oiled threads. oiled threads require less torque than a dry thread. i would guess at 10 percent less.

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02-08-2018 16:36:39

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 Re: torquing connecting rod caps head bolts in reply to jim_uny, 02-08-2018 16:14:16  
The little bit of light oil on the threads lubricates just enough so you get a correct torque. If you have ever tried to thread a slightly rusted or dry nut onto a bold and noticed it "binds" a little then goes? That little bit of binding could cause a loose rod or a head gasket to fail. Hope this explanation is helpful.

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