This is the Holset 3536621H, a new HX40 marine turbocharger (HX40M) for the Cummins 6BTA 5.9L M3 marine engine at 355 hp, listed for 1995 to 2006 engines. It is a new Holset unit, not a rebuild. It crosses to Cummins 3802829 and Holset 3536620, and the Cummins remanufactured numbers for the same turbo are 3802829RX and 3802829NX.

Marine turbos live a hard life. Salt air and a wet exhaust rust the turbine side, and a boat that sits lets the shaft seize. Loss of top-end rpm, black smoke on the way up to plane, oil in the aftercooler or a wheel that will not spin freely by hand are the usual signs. Check the exhaust elbow for water tracking back into the turbine before you fit the new turbo.

Specifications

Fits / Applications

• Cummins 6BTA 5.9L M3 marine engine, 355 hp, 1995 to 2006
• Old turbo tag reads 3536620, 3536621 or Cummins 3802829
• Confirm by engine serial number and CPL

Fit new gaskets, flush or replace the oil feed line, make sure the oil drain is clear, and prime the turbo with clean engine oil before the first start. Inspect the exhaust elbow and riser for corrosion and water tracking, and clean the aftercooler and intake piping.

Part Numbers & Cross Reference

Holset 3536621H  ·  Holset 3536620  ·  Holset / Cummins 3536621  ·  Cummins 3802829  ·  Cummins remanufactured numbers 3802829NX, 3802829RX

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Will the 3536621H fit my Cummins 6BTA marine engine?

It is listed for the 355 hp 6BTA 5.9L M3 from 1995 to 2006. Other 6BTA marine ratings can use a different turbo, so call 530-668-0818 with your engine serial number and old turbo tag number.

What numbers does it replace?

Cummins 3802829 and Holset 3536620 and 3536621. The Cummins remanufactured numbers 3802829NX and 3802829RX are the same turbo.

Is it new or remanufactured?

It is a new Holset turbocharger, not a rebuild.

What should I check before fitting it on a boat?

Look at the exhaust elbow and riser for corrosion and signs of water getting back to the turbine, and clean the aftercooler and intake piping. Water in the turbine is a common cause of repeat failures.

Related Parts

• Cummins 4BT 3.9L HX30W Wastegated Turbocharger | Holset 3592016HX Remanufactured (Cummins 3800709)
• Cummins 6BTA 5.9L Marine Mechanical Fuel Injector (3897197, 3802621) | Bosch 0432133854 New
• Cummins 4BT 3.9L / ISB / QSB 12-Volt VP30 Pump | 0470004018 | Bosch Authorized Remanufactured by VFI
• Holset HX35W Turbocharger | New | Cummins QSB

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.