E30 M52
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(Reserved for backhanded comment about you doing torques wrong)
Dan
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I want to believe you aren't doing something wrong, but I'm having a very hard time doing so.
I've rebuilt many of these motors, and the only time I had a stripped thread was the small torx screws that go into the timing cover.Those cam caps are a glorified hand tight, so I don't quite see how you are having so many issues.
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Let me know when you are ready to work on this again. I will stop by and supervise to provide the final word on whether or not you are right or the cylinder head threads are.
2011 E92 M3 6MT ZCP - ESS 625 supercharged
2007 Z4MR
2003 E39 M5
2002 E46 M3
2021 X5 40i -
You know there are different tightening torques for M6, M7 and M8 bolts right? Are you sure you don't have M6 bolts? Those are only torqued to 7ft/lbs.
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How do you have the camshaft? Could you take a picture of what you are doing? I am confused (easily). When I swapped an intake cam I had it turned so only the #1 cylinder lobes were down and tightened that cap first to compress the valve springs and my helper was holding the cam with a wrench to prevent it from turning while I installed the other caps and torqued it down. I think I might have needed longer bolts because the studs weren't long enough to get the nuts started. and then once all of the others were installed I rotated it so there was no pressure on that spot and removed the bolts and put the studs back on. It was a while ago and I was installing an m54b30 cam.
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You know there are different tightening torques for M6, M7 and M8 bolts right? Are you sure you don't have M6 bolts? Those are only torqued to 7ft/lbs.
Most definitely M7.
How do you have the camshaft? Could you take a picture of what you are doing? I am confused (easily). When I swapped an intake cam I had it turned so only the #1 cylinder lobes were down and tightened that cap first to compress the valve springs and my helper was holding the cam with a wrench to prevent it from turning while I installed the other caps and torqued it down. I think I might have needed longer bolts because the studs weren't long enough to get the nuts started. and then once all of the others were installed I rotated it so there was no pressure on that spot and removed the bolts and put the studs back on. It was a while ago and I was installing an m54b30 cam.
This is exactly how I am doing it. Cyl #1 lobes are the only ones under any valve spring pressure. Bearing cap #2 is installed first with a1/4 turn on each nut until its flush with the cam tray, then all other bearing caps are installed flush, then torqued evenly (1/4 turn on each nut) until it reaches 11 ft-lbs or the threads strip, whichever comes first.
At this point I am planning on having to repair every last one of them. If in some horrible nightmare I manage to start pulling-out the threads on the repaired holes, that's the point at which I will part it out, ban myself, lease a new Prius, and disappear from the car community forever.
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Strange. Is this on just one of the cams? Did you remove the studs from the head ever? I'm just speculating, could the studs not be fully seated and the stud is turning in the aluminum rather than the nut turning on the stud? Just grasping at straws. I guess I would just put inserts in all of them at this point.
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At this point I am planning on having to repair every last one of them. If in some horrible nightmare I manage to start pulling-out the threads on the repaired holes, that's the point at which I will part it out, ban myself, lease a new Prius, and disappear from the car community forever.
Thanks. I just spit water all over laughing.
Could it maybe justtttt MAYBE be that your torque wrench is out of calibration? I know you said that it is certified and calibrated, but it can EASILY get out of calibration if you leave it out and your offspring decides to play light saber wars with it or you simply tightened it to 100ftlbs and leave it like that over night for example.
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Stripped 6 or so with a small beam type torque wrench, went out and bought this Husky click style specifically so that the torque value I need lands right in the middle of the range and includes a calibration certificate.
The other 4 or 5 have been stripped with the new wrench
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Out of curiosity, do you have the correct torque value? I have heard that sometimes the bentley/hanes/etc can be off at times
He's right. I checked it against BMW's repair procedures.
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Attempt number 6382:
Started torquing intake cam.
Stripped a thread.
(Serenity now!)
Didn't rage.
Repaired stripped thread.
Started torquing cam again and....
1 cam successfully torqued!!!!
Holy crap!!!!!!!!!! How about the other one........
1976 530i e12
1990 325ix e30
1992 325i e36
1995 740il e38
2001 330xi e46
^More to come
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http://www.romraider.com/forum/viewforum.php?f=42
Just learned about the Siemens MS41 Tuning in a E28 swap thread, what is your plan for engine management this time?
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