Cummins ReCon Turbocharger 3770973RX | Reman | Cummins ISB / QSB

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Cummins ReCon Turbocharger 3770973RX, part number 3770973RX, for Cummins ISB/QSB (Holset). Supplied by Valley Fuel Injection & Turbo, a Northern California diesel specialist and authorized dealer since 1993, and shipped anywhere in the country.

Confirm Fitment Before You Order

Turbochargers are application specific, and the same engine often shipped with more than one turbo depending on year, emissions package, and rating. The number stamped on your existing unit is the one that settles it. Call 530-668-0818 with that number and we will confirm the exact match, at no charge, before you buy the wrong part.

Specifications

Part number 3770973RX
Brand Cummins
Condition Remanufactured (Cummins ReCon)
Application Cummins ISB/QSB (Holset)
Core charge $800, refundable when we receive your old unit back

Vehicle & Equipment Fitment

Years Vehicle / Equipment Engine Notes
Medium-duty trucks, buses & motorhomes Cummins ISB (on-highway) ISB is the on-highway version of the B-series
Construction, ag, marine & industrial equipment Cummins QSB (off-highway) QSB is the off-highway version

The ISB/QSB family is enormous and the same engine shipped with several turbo variants depending on year, emissions package and rating — publishing a vehicle list here would be a guess, and a guess gets you the wrong turbo. The number stamped on your existing unit settles it. Call 530-668-0818 with that number and we will confirm the exact match free before you buy.

Remanufactured to Factory Specification

This is a genuine Cummins remanufactured unit, built and tested to the same specification as new, with a real warranty behind it. That is a different thing from a “rebuilt” or “will-fit” turbo: the factory reman process replaces wear components and validates the finished unit against the original spec. A refundable $800 core charge applies and comes back to you when we receive your old unit in rebuildable condition.

Signs Your Turbo Needs Replacing

  • Loss of boost, low power, or long spool-up
  • Shaft play, or a wheel that has contacted the housing
  • Oil in the intake or exhaust, or blue smoke under load
  • Whining, siren-like noise that rises with engine speed
  • Cracked housing, or a turbo that has ingested debris

Worth saying plainly: a surprising number of “bad turbo” complaints are actually fuel problems. We test injection pumps and injectors every day, so if your symptoms point that direction, we will tell you before you spend money on a turbo.

Why Buy It From Valley Fuel Injection

We are not an order taker with a warehouse. We have been rebuilding and calibrating diesel fuel systems in Woodland since 1993, we are an authorized dealer for the people who actually build these units, and we ship nationwide. You get a genuine part, a real warranty, and someone on the phone who works on these engines.

Need a different turbo? We source almost anything: see turbocharger sourcing or browse all turbochargers. Chasing a fuel problem instead? See our injection pump and injector rebuild services.

Pricing covers the unit itself. Any applicable sales tax, shipping, and the refundable core charge (on remanufactured units) are additional. Buying tax-exempt? Qualifying diesel repair shops, fleets, farms, and agricultural operations can purchase tax-free. Set up tax-exempt purchasing by submitting your resale or exemption certificate once, and every qualifying order is tax-free going forward.

Why do I see this turbo cheaper online?
Short answer: it is usually not the same part — and a turbo failure feeds the engine. Read why ↓

Search any OE number and eBay, Amazon and a dozen storefronts will show it well under dealer cost, sold by outfits with no name, no address and no phone number. We lose business to those listings every week — and we see a lot of them come back through our shop. Here is what is actually different.

  • The part number proves nothing on its own. Counterfeit injectors and pumps are stamped with the same OE numbers as the real thing, in housings cast to look identical. The number in the listing title tells you what the seller claims it is, not what came off an OE line.
  • “Remanufactured” is not a regulated word. A genuine reman unit is stripped to bare components, has its wear parts replaced — nozzle, plunger and barrel, solenoid, seals — and is then run on a calibration bench until it meets the original flow and response spec. A cheap one is very often cleaned, resealed, painted and shipped. Both get called remanufactured.
  • No full teardown, so no idea what is worn. A proper rebuild means the unit comes apart completely and every part gets inspected and measured against spec — not just the ones that are obviously bad. Skip the teardown and you are reusing worn internals inside a freshly painted housing. It will run on the truck. It will not last.
  • No factory-spec bench load testing. A unit is not finished until it has been run under load on a test bench and made its numbers across the range, not just at one easy point. That bench time is most of what you are paying for. Sellers working on price cut it first, because nobody can see it in a photo.
  • The warranty has to be honored by someone. Everything we remanufacture in house carries a one-year warranty, with 30 days on electrical components. Parts we supply as an authorized dealer carry the manufacturer’s own warranty. Either way you call us, a real shop in California, and we sort it out. A marketplace warranty usually means shipping the part overseas at your own cost and hoping for a reply.
  • No core program. We credit your rebuildable core back in full. Discount sellers generally will not take one, so the gap narrows the moment you account for the core you are now stuck holding.
  • A turbo failure feeds the engine. When a bargain turbo lets go it can put oil and debris straight into the intake. What starts as a turbo you saved a few hundred on turns into an engine conversation. Balance and clearance data are not optional on a rotating assembly spinning past 100,000 rpm.

We are an authorized dealer and a working fuel-injection shop — we have been rebuilding and testing this hardware in Woodland since 1993, and the people who answer the phone are the people who run the benches. Not sure this is the right part for your engine? Call us with your serial number before you order and we will confirm it. Send your rebuildable core back and the core charge is refunded. And if a price somewhere else looks too good, call 530-668-0818 and we will tell you straight whether it is a deal or a problem.

Cummins ReCon Turbocharger 3770973RX | Reman | Cummins ISB / QSB
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