Engine Mount Knock Noise Over Sharp Bumps (Install New Engine Mounts)

Some customers may comment on a knock noise heard from the front suspension when driving over speed bumps or strong road undulations, where there may be sharp vertical load inputs. The noise may be described as sounding like an exhaust pipe hitting the floor. The noise may also be heard as a rattle when driving over continuous corrugations or undulations.

This condition may be caused by the momentum of the powertrain causing a noise from the hydraulic engine mount(s) when driving over sharp bumps.

Important: Submit a PIR for any post breakpoint vehicle that exhibits this condition or for any mounts marked with a white/blue paint spot that exhibit this condition.

After verifying that the vehicle has the condition described above, install new engine mounts.

Important: All service parts stock is of the revised type and no pre-breakpoint parts have been released to the field. For identification purposed, revised parts will be identified by a white or blue paint spot for a period of approximately three months after the breakpoints above. Exampleso f the markings are shown above.

For vehicle repaired under warranty, refer to the current Labor Time Guide for details of labor operation number and standard time.