main bearing torque

Thomas Wilcock
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23 Jul 2020 10:17 #40592 by Thomas Wilcock

Replied by Thomas Wilcock on topic main bearing torque

Thank you Jim. Another hurdle overcome.
Tom

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JIM.OBRIEN
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22 Jul 2020 23:39 #40587 by JIM.OBRIEN

Replied by JIM.OBRIEN on topic main bearing torque

Leave it at 58 ft-lbs

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Thomas Wilcock
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22 Jul 2020 10:08 #40572 by Thomas Wilcock

main bearing torque was created by Thomas Wilcock

This was discussed on the Forum about 12 years ago and was stated that the engine main bearings should be torqued to 90 ft. lbs. I am going to use new grade 8 bolts (150,000 lbs tensile strength) and the recommended torque for a 7/16" fine thread bolt is 58 ft.lbs. I tried torqueing one of the original Cord bolts to 90 ft.lbs. and could not get there. The bolt simply stretched. I think that 90 ft.lbs. would be much too high for the threads in the block. I have align bored my mains with 58 ft. lbs. Should I leave it at that?
Tom Wilcock

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