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Case Tractors Discussion Forum
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188 D head bolt question

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Dacaseguy

05-22-2020 17:46:21




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I知 putting my rebuilt head on my 530 diesel tractor. I知 looking in the Repair manual at the torque specs. It shows step 1 to torque the head to 60 lbs. then it shows step 2 to torque head bolts to 110-115 lbs ? I知 assuming the final torque is final torque is the 110-115. Can someone verify the torque. Thanks

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mEl

05-23-2020 13:58:32




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 Re: 188 D head bolt question in reply to Dacaseguy, 05-22-2020 17:46:21  
The manual will not tell you this but I would do a retorque after bringing the engine to operating temperature then allowing it to cool then retorque to spec by the pattern, loosening one bolt at a time 1/4 turn then bringing it back to torque, the back off is to break the initial resistance to breaking loose. do a reset on valve adjustment after this procedure.



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John Saeli

05-23-2020 20:20:28




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 Re: 188 D head bolt question in reply to mEl, 05-23-2020 13:58:32  
Well said Mel!! A very important step that is often overlooked. And your advice of backing off 1/4 turn is straight from the CASE Service Manual. Usually gains close to 1/2 a turn beyond the initial 1/4.



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rustred

05-23-2020 18:27:47




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 Re: 188 D head bolt question in reply to mEl, 05-23-2020 13:58:32  
on a fresh rebuild I have never saw anyone or myself back off the nuts to retorque a head. but yes a retorque is required after running to operating temperature for an hr. or two. plus a valve lash reset is a must as it will be tighter from the head retorque. you will gain 1/8 to 1/4 of a turn on the bolts.



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Adirondack case guy

05-23-2020 17:47:47




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 Re: 188 D head bolt question in reply to mEl, 05-23-2020 13:58:32  
Do as Mel said.-----------------Loren



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rustred

05-22-2020 18:09:32




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 Re: 188 D head bolt question in reply to Dacaseguy, 05-22-2020 17:46:21  
that would be yes for the final torque on the grade 8 bolts you have. I torque in 3 stages not 2 stages, then do a final check on them.



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Dacaseguy

05-22-2020 19:30:40




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 Re: 188 D head bolt question in reply to rustred, 05-22-2020 18:09:32  
Ok, thanks. I torqued them all at 40 and then at 60. Tomorrow I値l torque them to spec.



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