Some vehicles with turbochargers may emit an unsual sound when the vehicle is being driven at high rpm (revolutions per minute). The noise may be a sign of a defect in the turbocharger pedestal. This article discusses some things that hobbyists can do to confirm that the turbocharger pedestal has a problem.
Check Isolators and Hangers
Always inspect the entire exhaust system to confirm that all the isolators and hangers were positioned correctly. Fix any damage that you see on the system hangers. For example, straighten those that may be bent or you can replace them. You should also make sure that none of the isolators is bound up or damaged. Test the vehicle again and find out whether the moaning is still present.
Check Downpipe Alignment
Another component that you should investigate to be certain that the pedestal has issues is the downpipe of the catalyst. Loosen the downpipe of the exhaust system and check whether it is properly aligned with the inlet pipe of the catalyst. Test the vehicle again while the downpipe is in that loose position. Realign it well in case the moan disappeared when you loosened the downpipe. Tighten the downpipe once you are sure that is now correctly aligned to the inlet pipe.
Check the Part Number
It is also prudent to check the part number indicated on the turbocharger pedestal. Check the vehicle's manual and ascertain whether the part number listed there matches what the current pedestal has. Get a replacement pedestal in case the part numbers aren't identical. Ask a technician to recommend an alternative pedestal in case the one with the recommended part number isn't available.
Check the Bolts
The moaning that you hear when the turbocharger is working could also be connected to the improperly torqued bolts that anchor the turbocharger onto its pedestal. Start by looking at the bolts and moving them with your hands to establish whether any of them is loose. Next, use a torque wrench to remove those bolts and reapply them in accordance with the specifications of the pedestal manufacturer. Make sure that you have applied the specified lubricant to those bolts before tightening them.
Consider replacing the turbocharger pedestal in case all the measures above don't put an end to the moaning sound. Consult a professional before buying the replacement pedestal just in case another component of the turbocharger is causing that undesirable sound in your vehicle.
Share29 January 2018
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