The manufacturer would not want any warranty claims for leaking cylinder head gaskets as this proves very costly. There is no guess work in torquing or angle tightening cylinder head bolts down, the seating is not really the issue but rather the clamping load on the cylinder head gasket to ensure that no leakage/damage would occur. I've not been afforded the time for further research into this matter, however, a cylinder head bolt is a stretch bolt, so when the bolt is torqued down to a given specification the manufacturer like a technician can remove the bolt and measure the new length, and I'd suspect that the technician can do like wises with a bolt that has been angled tightened, however that still does not tell the technician what angle torque would have initially been agreed from the manufacturer specifications. Thank you to anyone who can help me solve this.Ĭlick to expand.Thank you for your reply, and sorry for my very late reply to this inquiry. How then would this problem be solved with two unknowns? My tool length is 2 m, which is the radius, the force is applied from my arm, which is unknown, thus the torque applied is also unknown. I'm given an angle measurement 75 degrees. This then brings me to my question and the formula T = Fr sin (theta) We contact the manufacturers agent who advises the only information available has been given and we now struggle to find the correct torque data, and given that the manufacturer only gives an angle measurement we cannot compare that to any torque figures! Further investigations on the engine find the cylinder head gasket has not properly been compressed, thus leaks. You dismantle the engine and find that the 'clamping force' the manufacturer recommended in angled degrees seems to be incorrect. You repair the engine and a few weeks later the car returns with the cylinder head gasket leaking again! You might then ask, why the is the problem with that?Ĭustomer asks for a diagnosis on an engine over heating, you diagnose the cylinder head gasket leaking. This now is not always the case you can be given a angle torque only. I'm not a mathematician by any stretch of the imagination hence why I asking if this is at all possible, which it must be as car manufacturers do it!Īngle tighten a bolt and you either get an angle in degrees to work to, or a torque in Newton Metres to torque the bolt to. We had a formula T = FR which read torque = force x radius. We covered the basics many years ago at college but nothing too deeply was ever completed in maths with the formula.
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