3 ms·
I think it's because torque specs for cars assume unlubricated threads. If you lubricate them and torque them to spec, you'll overtighten them.
by frosted-flakes 5y ago
I think it's because torque specs for cars assume unlubricated threads. If you lubricate them and torque them to spec, you'll overtighten them.
- johnnyApplePRNG 5y agoHow does a torque wrench know the nuts are lubricated? Is 80 foot pounds of torque not 80 foot pounds of torque no matter the level of lubrication?
- alangibson 5y agoNo (sort of). You're not looking for torque, you're looking for tension on the bolt as it stretches. Torque is just a proxy To tension on lubed and unlubed bolts will be different at 80 ft-lbs due to friction loses.
- WalterBright 5y agoMany bolts have a lubed spec and a dry spec. The dry one is, of course, completely unreliable. If it is lubed and ain't turning smoothly, take it out and clean the threads. Or get a better grade of bolts.