Detroit Diesel Turbo Rebuild Service

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Nationwide mail-in service. 12-month unlimited mileage warranty. In-house CIMAT VSR balancing on every rebuild.

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Real Failures We See
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PT Turbo rebuilds and remanufactures Detroit Diesel turbochargers in-house at our San Bernardino, CA shop. Every unit goes through a full teardown, OEM-spec or better parts replacement, CIMAT VSR balancing, and final quality inspection before it ships back — backed by a 12-month unlimited mileage warranty and nationwide mail-in service.

Best For

Freightliner and Western Star on-highway trucks
Series 60 and DD13/DD15/DD16 engines
Heavy-duty commercial fleets
Coach and transit bus applications

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About Detroit Diesel Turbocharger Rebuilds

PT Turbo has been remanufacturing Detroit Diesel turbochargers since 1978, covering everything from the legacy Series 60 to the current DD13, DD15, and DD16 platforms found in Freightliner and Western Star trucks. We disassemble each unit to bare components, inspect the shaft and wheels for fatigue and rub damage, replace bearings and seals with new hardware, and re-balance the rotating assembly to factory tolerance. The result is a turbo that performs like new without the parts-counter price of a complete OE replacement.

This service is built for owner-operators, fleet maintenance shops, and transit operators who need a reliable turbo and a fast turnaround. On most Detroit Diesel units the housings, VGT actuator, and center section are perfectly serviceable, so rebuilding the core you already have is both cheaper and faster than sourcing a new variable-geometry unit that can sit on backorder. When the bones are good, a rebuild is almost always the smarter call.

Common Detroit Diesel Applications

On-Highway Trucks

Freightliner Cascadia and Columbia with DD13, DD15, and DD16 engines
Western Star 4900, 5700, and 49X with DD15 and DD16
Freightliner Century and Classic with Series 60 12.7L and 14.0L

Engine Families

Series 60 (mechanical and DDEC, 11.1L / 12.7L / 14.0L)
DD13 single variable-geometry turbo
DD15 with single GTC and earlier two-stage turbocompound layouts
DD16 high-output variable-geometry units

Fleet, Vocational, and Transit

Heavy-duty linehaul and regional fleet trucks
Vocational and severe-duty Western Star chassis
Coach and transit bus applications running Series 60 and DD-series power

Common Detroit Diesel Turbocharger Symptoms

Excessive shaft play, audible rattle, or contact between the compressor wheel and housing on high-mileage Series 60 and DD15 units
Oil seeping from the compressor or turbine seals, blue smoke at idle, and oil pooling in the charge piping
A rising whine or siren-like noise that increases with boost, indicating worn journal bearings or wheel imbalance
VGT vanes or unison ring sticking, throwing actuator position and turbo speed fault codes on DD13/DD15/DD16
Low boost, sluggish throttle response, and derate from a VGT that cannot reach commanded vane position
Overboost spikes and limp mode when the variable-geometry mechanism hangs in a closed position
Black smoke under load caused by restricted exhaust flow through carboned vanes
Sudden bearing failure with metal in the oil after a feed line restriction or delayed oil pressure on cold start

Real Detroit Diesel Failures We See in Our Shop

On DD13, DD15, and DD16 variable-geometry turbos we frequently see soot and carbon packing the vane pack and seizing the unison ring. The actuator commands a position the mechanism physically cannot reach, and the truck logs turbo speed and VGT position faults before going into derate.
We see a lot of DD15 turbocompound and two-stage units come in with electric actuator failures. The gear train and position sensor inside the actuator wear or lose calibration, and shops often replace the whole turbo when the core and rotating assembly are still good.
On Series 60 units we regularly find bearing failure traced back to oil supply problems: a partially blocked feed line, coked oil from hot shutdowns, or stretched oil drain intervals. The result is wiped journal bearings and a scored shaft with heavy thrust wear.
We see compressor wheel damage from charge-air leaks and ingested debris when a clamp or boot lets go upstream. Even a small amount of FOD nicks the wheel tips, throws the balance off, and starts the bearings down a fast wear path.
On high-mileage DD-series turbos we find heat-cracked turbine housings and warped VGT bores from repeated thermal cycling, which is what lets the vanes start to stick in the first place.
On units run hard without proper cooldown we see turbine-side oil coking that bakes the seal area, leading to oil migration into the exhaust and the blue-smoke complaint that brought the truck in.

Frequently Asked Questions

Can my Detroit Diesel turbocharger be rebuilt?

In most cases yes. If the housings, shaft, and VGT bore are intact, we can rebuild the unit to factory spec with new bearings, seals, and a balanced rotating assembly.

Do you need the whole turbo or just the core?

We prefer the complete unit including the actuator and housings so we can test the full assembly, but we can work with a bare core when that is all you have.

Is a rebuild cheaper than buying a new turbo?

Almost always. A rebuild typically runs a fraction of a new OE variable-geometry unit, and it avoids the backorder delays that come with new DD-series turbos.

Do you balance the turbo after rebuilding it?

Yes. Every rotating assembly is high-speed balanced after reassembly, which is what eliminates the whine and prevents repeat bearing failures.

Do you accept nationwide mail-in turbos?

We do. Fleets and owner-operators ship us cores from across the country every week, and we turn them around and ship them back rebuilt and tested.

What if my turbo is too damaged to rebuild?

If a wheel or housing is beyond salvage we will tell you up front and source a quality replacement or alternate core rather than rebuilding something that will not last.

What is the difference between the DD13 and DD15 turbocharger?

The DD13 uses a single variable-geometry turbo sized for the smaller 12.8L engine, while the DD15 has run both single GTC units and earlier two-stage turbocompound setups, so the actuator and housing parts are not interchangeable between them.

Why does my DD15 throw a VGT position or turbo speed fault?

The most common cause is soot locking the vanes and unison ring so the turbo cannot reach commanded position, often combined with a worn or out-of-calibration electric actuator. A rebuild that cleans and frees the vane pack and verifies actuator travel clears it.

How long should a rebuilt Detroit Diesel turbo last?

With clean oil, proper drain intervals, and a real cooldown before shutdown, a properly rebuilt and balanced unit will run several hundred thousand miles, on par with the original.

How to Identify Your Detroit Diesel Turbo

The identification tag is typically located on the compressor housing, bearing housing, or center section of the turbocharger. It usually lists the model number, assembly number, and serial number. If you’re not sure which Detroit Diesel model you have, send PT Turbo a photo of the tag and we’ll help identify it before you ship anything.

PT Turbo Warranty

12-month, unlimited mileage warranty against defects in parts and workmanship
Final quality inspection on every rebuild: leak test, visual inspection, actuator or wastegate function check
In-house CIMAT VSR balancing with a balance report included
Nationwide mail-in service — you don’t need to be local

Why Customers Choose PT Turbo

Rebuilding turbochargers, including Detroit Diesel, since 1978
In-house CIMAT VSR balancing on every unit, not outsourced
Full housing sandblasting and OEM-spec or better parts replacement
Inspect first, quote before work begins — no surprise charges
Nationwide mail-in service from our San Bernardino, CA shop

PT Turbo Inspection Process

Every turbocharger goes through the same evaluation before any work begins:

Initial evaluationcompressor wheel, turbine wheel, shaft, bearing housing, VGT assembly (if equipped), actuator, and seal surfaces are checked first.
Complete disassemblythe turbocharger is fully torn down and every major component is inspected individually.
Cleaningcomponents are cleaned to remove carbon, oil residue, rust, and contamination.
Measurementcritical tolerances are measured against OEM specification.
Reassemblyrebuilt using new wear components matched to your specific model.
CIMAT VSR balancingthe rotating assembly is balanced in-house, with a balance report included.
Final inspectionleak test, visual inspection, and actuator or wastegate function check before shipment.

No work begins without your approval. You receive a quote after inspection, not before.

Pricing

Most rebuilds require inspection before final pricing. Standard rebuild pricing depends on the turbo model, parts availability, wheel condition, shaft condition, housing damage, and whether upgrades are requested. PT Turbo inspects every turbo and sends a quote before any work begins — no surprise charges.

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