188 D head bolt question

dacaseguy · May 22, 2020

I?m putting my rebuilt head on my 530 diesel tractor. I?m 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?m assuming the final torque is final torque is the 110-115.
Can someone verify the torque. Thanks

rustred · May 22, 2020

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.

dacaseguy · May 22, 2020

Ok, thanks. I torqued them all at 40 and then at 60. Tomorrow I?ll torque them to spec.

mEl · May 23, 2020

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.

Adirondack case guy · May 23, 2020

Do as Mel said.-----------------Loren

rustred · May 23, 2020

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.

John Saeli · May 23, 2020

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.

188 D head bolt question

dacaseguy

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rustred

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dacaseguy

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mEl

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Adirondack case guy

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rustred

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John Saeli

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