Improperly Torqued Flanges Can Result in Leaks, Warping, and Failure

Challenge:

Exhaust flanges that are improperly tightened or torqued can cause many problems. These include exhaust system leaks and associated component failure, like gaskets and studs, and premature system fatigue and failure.

Solution:

Progressively Tighten Bolts on Flanges Flanges are found on a variety of parts associated with exhaust repairs. Each has its own process for achieving proper torque and successful installation. In general, all nuts are secured following a progressive, higher torque sequence. For example, the nuts require 60-ft.-lbs. of torque. Begin by torquing nut one, two and three to 20-ft.-lbs. Then, tighten all three nuts to 40-ft.-lbs., and finish by tightening each to 60-ft.-lbs.

For Y-Pipes:
It’s important to secure both sides of the Y-pipe simultaneously. Begin by tightening nuts down in a rotating sequence between both pipes. It is also necessary to alternate between both flanges found on the Y-pipe.

For Manifold Converters:
Typically, the tightening sequence begins in the middle of the manifold, while working your way out evenly between both sides. Be sure to review manufacturer’s recommended torque sequence for each application.

IMPORTANT:
In all installation instances above, tighten all studs evenly throughout the process.
Always evenly alternate between both flanges found on the Y-pipe while following the proper sequence on each individual flange.