Replace Head Studs?
#241
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#242
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Hi Greg
I'm about to embark on the reassembly of a 16v with new studs and head gasket. Have you found the current batch of studs from Porsche have the same characteristics as the ones you started the thread about? By that i mean are you still favouring both the 2x 90 degree angle or original torque methods for new studs?
Thanks
Ben
I'm about to embark on the reassembly of a 16v with new studs and head gasket. Have you found the current batch of studs from Porsche have the same characteristics as the ones you started the thread about? By that i mean are you still favouring both the 2x 90 degree angle or original torque methods for new studs?
Thanks
Ben
#243
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Hi Greg
I'm about to embark on the reassembly of a 16v with new studs and head gasket. Have you found the current batch of studs from Porsche have the same characteristics as the ones you started the thread about? By that i mean are you still favouring both the 2x 90 degree angle or original torque methods for new studs?
Thanks
Ben
I'm about to embark on the reassembly of a 16v with new studs and head gasket. Have you found the current batch of studs from Porsche have the same characteristics as the ones you started the thread about? By that i mean are you still favouring both the 2x 90 degree angle or original torque methods for new studs?
Thanks
Ben
That being said, I have not tried 3x for several years, now....I got really tired of buying new sets of head studs (and head gaskets) to replace new, yielded, head studs.
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greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
#244
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Cheers
Ben
#245
Rennlist Member
A bit off topic, but connected. Mate once worked on an oil rig in sea off SE Oz. It had a crane for lifting supplies and personnel off barges some 50M below. Every so often a maintenance man came on board and went around checking stuff. On the crane base he was observed to apply a very large wrench to the nuts (threads probably somewhere around 2" or more) and give them a pull. Mate, being somewhat mechanical, wondered about this as a bit incorrect. One day the crane was asked to lift a heavy load and the threads cried enough and let go, the whole structure went into the sea, complete with operator. He survived with minor injuries. Apparently the the threads went plastic due to over tightening, and were observed to look like they were still OK.
jp 83 Euro S AT 57k
jp 83 Euro S AT 57k
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SwayBar (12-27-2019)
#246
Rennlist Member
A bit off topic, but connected. Mate once worked on an oil rig in sea off SE Oz. It had a crane for lifting supplies and personnel off barges some 50M below. Every so often a maintenance man came on board and went around checking stuff. On the crane base he was observed to apply a very large wrench to the nuts (threads probably somewhere around 2" or more) and give them a pull. Mate, being somewhat mechanical, wondered about this as a bit incorrect. One day the crane was asked to lift a heavy load and the threads cried enough and let go, the whole structure went into the sea, complete with operator. He survived with minor injuries. Apparently the the threads went plastic due to over tightening, and were observed to look like they were still OK.
jp 83 Euro S AT 57k
jp 83 Euro S AT 57k
#247
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32V head bolt torque procedure
I just came across this thread,very timely as I blew a head gasket on my race car due to stripped out threads in the block.( possibly over torqued, 4 X 90 by mistake) I had to install thread certs in the two center holes in the block.
Im just wondering what the consensus is on head bolt torquing on a 32 V engine these days. Sounds like 20Nm plus 3 X 90 then after a few hours back them off 90 degrees one at a time and go to 75 ft pounds.
Is that correct?
Im just wondering what the consensus is on head bolt torquing on a 32 V engine these days. Sounds like 20Nm plus 3 X 90 then after a few hours back them off 90 degrees one at a time and go to 75 ft pounds.
Is that correct?
#248
Nordschleife Master
#249
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I'm betting that getting the metal analyzed from all three would tell volumes/would be super interesting and would be a great place to start.
I have samples of all three and could send them out. I also have ARP studs, which apparently (in my opinion), do not stretch enough at the given torque, which I could send, too.
Last edited by GregBBRD; 12-24-2019 at 11:07 PM.
#250
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https://www.nts.com/location/boxborough-ma/
2 thumbs-up from CarChick who used their services on many occasions.
#251
Nordschleife Master
#252
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This by far is the best thread I've ever read on Rennlist.
I used it to torque down a set of S3 heads.
These were my steps.
Cleaned and chased the studs. All the plating was in good order.
Placed the the head gaskets and heads in place.
Roughed up the washers.
Marked them
Placed them on the studs and pointing the mark to 12 o'clock as you face the heads from either side
Used a QTip to lightly oil the top of the washer and the exposed threads
Loaded nut (all new) into a 19m socket on an extension
Lightly oiled the nut threads and exposed nut surface
Tilted the nut into place on the stud and hand tightened them
Then 15 ft lbs and 3 90 dg turns with my digital torque angle wrench
Came back and measured the resulting torque and all of them near 75 ft lbs and were within a couple of ft lbs of each other.
Very satisfying.
I used it to torque down a set of S3 heads.
These were my steps.
Cleaned and chased the studs. All the plating was in good order.
Placed the the head gaskets and heads in place.
Roughed up the washers.
Marked them
Placed them on the studs and pointing the mark to 12 o'clock as you face the heads from either side
Used a QTip to lightly oil the top of the washer and the exposed threads
Loaded nut (all new) into a 19m socket on an extension
Lightly oiled the nut threads and exposed nut surface
Tilted the nut into place on the stud and hand tightened them
Then 15 ft lbs and 3 90 dg turns with my digital torque angle wrench
Came back and measured the resulting torque and all of them near 75 ft lbs and were within a couple of ft lbs of each other.
Very satisfying.