| Author | Message | ||
     JoachimRatz Unregistered guest Posted From: 87.166.190.98 |
Hello, I need to change the cylinder head gasket on my 25/30. Unfortunately I don't have any documentation about the torque of the cylinder head bolts. The historical documents only describe the lever length of the key and that the experienced mechanic can estimate the force. Does anyone have any experience with what torque this corresponds to? Thanks for the answer in advance. Joachim (Message approved by david_gore) | ||
| Koen Dierckxsens New User Username: prewarrb Post Number: 3 Registered: 04-2024 |
Joachim, Checking available documentation, you will find different torque figures for these 5/16"BSF head nuts: 11, 18 and 20 lbs-ft. I can assure you 20lbs-ft is just WAY to much!!! If your studs are "as new", you can go to 18 lbs-ft. If you do not know the condition of your studs, then you play safe with 16 lbs-ft or even less. The figure 11 lbs-ft may sound a little odd. As a matter of fact, it is all but "odd". That is how RR engineers did work on cars : low torque figures, but checking and tigntening nuts quite often. Best regards, Koen, | ||
| ChristopherCarnley Unregistered guest Posted From: 217.43.77.12 |
Not more than 20 lbft, or 30Nm, with the needle indicator type, not a break back. Start with the central 4 cleaned nuts and threads, then work outwards concentrically, evenly, don,t jerk. Start with 10 lbft and build up to full load, gradually. Check that the nuts are not bottoming on the threads. Start the engine, warm it up, then when cold, remove the rocker shaft and retighten the nuts. (Message approved by david_gore) | ||
| ChristopherCarnley Unregistered guest Posted From: 18.132.38.165 |
You will have difficulty in obtaining a torque wrench to operate successfully below 20 lbft, or even at that figure. The long studs will be stretched by now, after several tightenings, probably after tightening to above 30lbft. The matter is not all that critical. Thanks,David. (Message approved by david_gore) |
