Marine Turbo Rebuild Service

Need Your Marine Turbo Rebuilt?

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

Get a Rebuild Quote →
Download Mail-In Rebuild Form
✆ (909) 824-1020

On This Page

Applications
Common Symptoms
Real Failures We See
FAQ
Warranty
Request a Quote

PT Turbo rebuilds and remanufactures Marine 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

Marine diesel propulsion engines
Volvo Penta, Yanmar and Cummins marine applications
Commercial and recreational vessels
Generator sets on board

Shop Marine turbochargers in stock at PT Turbo →

About Marine Turbocharger Rebuilds

PT Turbo rebuilds marine turbochargers for diesel propulsion engines, onboard generator sets, and auxiliary power units running in saltwater and freshwater service. We handle the units found on Volvo Penta, Yanmar, and Cummins marine platforms, restoring each one to factory shaft tolerances, flow rates, and boost targets so your vessel runs reliably whether you are running a commercial workboat or a recreational cruiser.

Marine turbos are expensive to replace outright, and many new units carry long lead times that leave a boat tied to the dock during peak season. A proper rebuild restores the same housing your engine was engineered around, corrects the actual failure rather than masking it, and typically costs a fraction of a new assembly. For most marine owners and yards, rebuilding the original core is the smarter and faster route back on the water.

Common Marine Applications

Marine Diesel Propulsion Engines

Volvo Penta D-series inboard and sterndrive diesels
Yanmar 4JH, 6LP, and 6LY series propulsion engines
Cummins QSB, QSC, and QSM marine diesels
Single and twin-engine sportfish and cruiser installations

Commercial and Recreational Vessels

Commercial workboats, charter, and fishing vessels in continuous-duty service
Recreational trawlers, cruisers, and sportfishing boats
Repower and refit turbo restoration for older hulls

Onboard Generator Sets and Auxiliary Power

Cummins Onan marine gensets
Northern Lights and Kohler diesel generator turbos
Auxiliary and house-power diesel sets

Common Marine Turbocharger Symptoms

Excessive shaft play or audible bearing rattle from salt-air corrosion attacking the bearing housing
Oil weeping from the turbine or compressor seals, often showing as oil in the intercooler or exhaust elbow
High-pitched whining or siren noise indicating worn journal bearings or compressor wheel contact
VGT or actuator sticking on Cummins QSB and QSC units, causing inconsistent boost and limp-mode events
Low boost and sluggish acceleration under load, especially noticeable when planing or pushing into a current
Overboost or boost spikes from a stuck wastegate or failed actuator diaphragm
Black or gray smoke under load as boost falls short of fuel demand
Compressor or turbine wheel damage from ingested debris, salt deposits, or a failed air filter element

Real Marine Failures We See in Our Shop

On Cummins QSB and QSC Holset VGT units, we frequently see the sliding nozzle ring seize from soot and salt buildup. The actuator cannot stroke the vanes, and the engine throws boost faults or drops into limp mode even though the bearings are still good.
We see a lot of saltwater intrusion through the exhaust elbow on closed-cooled marine engines. When the elbow corrodes or carbons up, water backs into the turbine housing and rusts the wheel, shaft, and bearing housing from the exhaust side in.
On Yanmar 6LP and 6LY turbos, oil seal failure is common when owners shut the engine down hot without idling first. The bearing housing coke-locks the seals, and we find scored journals and blued shafts when the units come in.
Volvo Penta D4 and D6 units come in with compressor wheel erosion from salt mist and moisture pulled through the intake, which throws the rotating assembly out of balance and accelerates bearing wear.
On continuous-duty commercial and genset turbos, we see classic oil-starvation bearing failure traced back to clogged supply lines, degraded oil, or extended drain intervals in a hot engine room.
We regularly find wastegate and actuator diaphragms that have hardened and cracked from engine-room heat cycling, which lets boost spike or hunt and eventually damages the turbine wheel.

Frequently Asked Questions

Can my marine turbocharger be rebuilt?

In most cases yes, as long as the housings are not cracked through. We replace the bearings, seals, and rotating assembly and restore the unit to factory tolerances.

Do you need the whole unit or just the center core?

We can rebuild a complete turbo or just the center cartridge (CHRA), whichever you send us. Sending the complete unit lets us inspect the housings and actuator for corrosion and damage.

Is a rebuild cheaper than a replacement?

A rebuild is typically a fraction of the cost of a new marine turbo, and it reuses the housings your engine was engineered around. You also avoid the long lead times that often come with new marine units.

Do you balance the turbo after rebuilding?

Yes. Every rotating assembly is balanced, and we VSR balance the complete cartridge at operating speed to eliminate the vibration that destroys bearings.

Do you accept nationwide mail-in turbochargers?

Yes. We rebuild and ship marine turbos for customers and boatyards across the country every week. Pack the unit securely and we handle the rest.

What if the damage is too severe to rebuild?

If a housing is cracked or a wheel is beyond repair, we will tell you up front and source a replacement housing or recommend a new or remanufactured unit instead of charging you for a rebuild that will not last.

What is the difference between the Volvo Penta D4 and D6 turbos?

The D6 uses a larger frame turbo to support its higher displacement and output, so the housings, wheels, and cartridges are not interchangeable. We rebuild both, but the correct part numbers matter for boost matching.

Why does my Cummins QSB go into limp mode under load?

That is almost always the Holset VGT nozzle ring sticking from soot and salt deposits, which keeps the actuator from controlling boost. Cleaning, re-machining, and rebuilding the cartridge restores proper vane movement.

How long should a rebuilt marine turbo last?

A properly rebuilt and balanced marine turbo will run the life of the engine if oil is changed on schedule, the engine is idled down before shutdown, and the air and exhaust paths are kept clean of salt and debris.

How to Identify Your Marine 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 Marine 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 Marine, 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.

More Resources

Request a Marine Turbo Rebuild Quote