Acura NSX 2016-present Suspension Bolt Torque Specifications

Using a torque wrench ensures that each bolt is tightened to the manufacturer's specified torque. This prevents under-tightening, which can cause components to loosen, leading to instability and potential failure. Over-tightening can damage the bolts or the components, potentially causing cracks, stripped threads, or preload issues. For example, an over-tightened control arm bolt could cause premature bushing wear or even damage the control arm itself.

Generally, yes, especially for bolts that are not self-locking or specified as torque-to-yield. Refer to the Acura NSX service manual. Honda/Acura commonly use liquid thread locker (e.g., Loctite 242/243) on suspension bolts to prevent loosening due to vibrations. Always check the specific application and follow the manufacturer's recommendations. For example, a lower control arm bolt may require a medium-strength thread locker. Never use a thread locker on torque-to-yield bolts unless specified by the OEM.

Some suspension bolts are torque-to-yield (TTY), meaning they are designed to stretch and deform when tightened. These bolts should always be replaced after removal. For non-TTY bolts, it’s good practice to inspect them for any signs of wear, damage or stretching and replace them if there is any doubt. Check the service manual for torque-to-yield specification. A stretched TTY bolt can cause the suspension to be compromised if reused and not torqued properly. It's always recommended to use new bolts when applicable.

Incorrect torque sequence can cause uneven pressure on mating surfaces and cause binding or misalignment of suspension components. For multi-bolt assemblies, you should tighten them in a criss-cross or star pattern. For instance, if tightening a control arm where 3 bolts are used, tighten them incrementally in a star pattern to the final torque spec. Failing to do so can cause the component to become misaligned or place excessive stress on one bolt before the other resulting in damage to components or bolt failure.

Torque wrenches should be calibrated periodically to ensure accuracy. It is generally recommended to calibrate your torque wrench every 12 months or after 5,000 uses, whichever comes first. Professional calibration services can test and adjust the wrench to the correct values. It's best practice to store your torque wrench at its minimum value to maintain accuracy. Avoid using it as a breaker bar. Incorrectly calibrated torque wrenches can result in over or under-torquing of bolts which is dangerous.