The turbo is done. You've accepted it. Now the expensive mistake most people make is stopping there.
A turbo that fails (especially one with bearing failure or a broken wheel) doesn't fail quietly. It sends debris downstream. It sends oil where oil shouldn't go. And if you bolt a fresh unit onto a contaminated system, you will be doing this again in short order.
Here's what to check before anything goes back together.
The Oil System
This is the most important step and the one most often skipped.
Bearing material, shaft metal, and carbon deposits from a cooked center housing can travel through your oil circuit. If you don't flush the system, that contamination sits in your oil passages, oil cooler, and oil lines waiting to score the bearings on your new turbo from day one.
Change the oil and filter before startup. If the failure was severe (broken wheel, spun bearing, significant metallic debris), drop the pan and inspect it. Metal in the pan means metal in the passages. An oil flush or full oil system cleaning is not optional at that point.
Inspect the oil feed line to the turbo. If it's restricted, cracked, or coated with varnish buildup, replace it. A new turbo starved of oil on its first heat cycle will fail faster than the one you just pulled.
The Intake Tract
When a compressor wheel fails, fragments go somewhere. Usually forward into the intercooler and intake piping.
Pull the intercooler and inspect it. Shake it. Listen. Any metallic debris inside needs to come out before you run the engine. An intercooler flush is cheap. Ingesting wheel fragments into a freshly rebuilt engine is not.
Check every section of intake piping between the turbo and the throttle body or intake manifold. Look for impact marks, cracks from overpressure, or debris lodged in bends.
The Exhaust Side
Turbine wheel failures send material downstream into the exhaust. In most cases this exits the system, but on vehicles with a diesel particulate filter or catalytic converter close to the turbo, debris can lodge and cause restriction.
If you're noticing backpressure symptoms after the replacement (sluggish spool, high EGTs, black smoke on a diesel), inspect what's downstream.
The Root Cause
A turbo does not fail without a reason. Replacing the unit without finding the cause means you're on a clock until it happens again.
The most common causes we see: oil starvation from a weak pump or blocked feed line, oil contamination from a failing engine or extended service intervals, boost leaks forcing the turbo to overspeed, and heat soak from shutdown habits.
Fix the system. Not just the turbo.
MIC Turbo inspects, rebuilds, and remanufactures turbochargers for all major applications. If you're not sure what caused your failure, we can tell you when we inspect it. Based in Hialeah, Florida. Ships nationwide.