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911sc oem 10mm rod bolts and nuts question

Hi Everyone
I need help and advice, Iím starting to rebuild my 911sc engine but I think I made the first mistake
I got new OEM style rod bolts and nuts and I torqued them according to Wayneís book 20Nm and 90 degrees, now I realized that this is probably not the correct method for these oem rod bolts and nuts
What should I do now? Leave as is, disassembly the rods and get new oem bolts & nuts and torque them to 50-55Nm only, or a new ARP rod set ?
Anyone had this issue before?
Thanks
Jose
Old 05-31-2018, 07:15 PM
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Why take a risk. Remove and go with ARPs then check for proper stretch specs.
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Old 05-31-2018, 07:31 PM
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I agree that ARPs are the way to go. I was told that the rod ends need to be redone with the ARP bolts because they are torqued to a higher number so I had the local Porsche machine shop do that job. I can be sure this is absolutely necessary but I did it to be sure. Use a stretch gauge to ensure preload.
Old 05-31-2018, 10:14 PM
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Conrod Bolt "re-use" question
Old 06-01-2018, 12:27 AM
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What is the correct torque process for these OEM 10mm connecting rods bolts ?
Old 06-01-2018, 07:49 AM
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The factory spec for the 10.00mm x 1.25 bolt is 20NM and 1 x 90 degree.

There is nothing wrong with the factory bolt if its used in the application it was designed for. Proper installation is always required.


Every time bolts are exchanged the rod BE has to be measured. If the BE size is out of spec, then the new bolt will be stretched a minimum of 3 times. Its good practice and I would suggest that all the bolts are identified and their free length measured before installation. Then their stretched length can be measured, but more importantly as in the case, after any tightening, the bolts initial free length can be compared. As long as the bolt returns to its free length, it can be reused.

Hope this helps.

Discard any bolt that does not return to its free length.
Old 06-01-2018, 04:06 PM
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Maybe I should explain the 3 times the bolt gets stretched.

1st. Installation and measure the BE size.
2nd. Fit bearings after rebuilding to measure bearing ID.
3rd. Fit rods to crankshaft.
Old 06-01-2018, 04:10 PM
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