HX35W Turbocharger 4038597 4955156 – Direct Fit for Cummins QSB6.7 Tier-3

Variant Differences Verified — each HX35W turbocharger build is matched against your engine serial range and port configuration before dispatch.

Technical Specifications

Application Suitability

When the Same Turbo Number Means Four Different Builds

The part number alone does not guarantee fitment — variant differences within the HX35W family determine whether the unit bolts on and connects without modification.

Over the years on Indonesian job sites, I have watched a turbo sit on the bench for days because the oil feed inlet was rotated fifteen degrees from what the hose routing allowed. The cross-reference table said the numbers were interchangeable, and technically they were — for a different engine generation [NEED_CITE: Cummins QSB6.7 turbo variant identification across engine serial ranges]. A machine already torn down for turbo replacement cannot afford a second teardown waiting for the correct build. The Turbocharger HX35W for Cummins QSB6.7 appears under dozens of superseded references, and copied cross-reference sheets routinely pass forward errors that put the wrong variant in your hands.

Engine Serial Range and Variant Mapping

The HX35W family spans multiple compressor housing configurations, turbine housing A/R ratios, and wastegate calibrations across the Cummins QSB6.7 Tier-3 production run. Matching the correct Turbocharger HX35W for Cummins QSB6.7 requires confirming your engine serial number against the applicable build window, not simply matching a single reference number. Superseded numbers such as 4038597R, 4955156NX, and 5452082RX each point to specific production revisions that differ in port orientation or actuator bracket geometry.

Interface Points That Decide Fitment

Turbine housing flange bolt pattern, compressor inlet diameter, oil feed and return port clocking, and wastegate actuator bracket shape are the four interfaces where a technically correct part number still fails physically. I once dealt with a QSB6.7 replacement where references 4038597 and 4955156 were listed as interchangeable, yet the oil inlet angle created a hard interference with the existing supply line [NEED_CITE: turbocharger oil port orientation differences across Cummins QSB production variants]. Before committing to bulk, we verify every interface dimension against your existing unit photograph or nameplate image, and supply a single sample unit for trial fitment when the application is uncertain.

Reading the Specification Sheet for This Turbocharger

The HX35W designation covers a wastegated turbocharger designed for the mid-range displacement and boost requirements of the QSB6.7 platform. The A77J70GM/A70Q86FE14PB-W variant code encodes the compressor wheel trim, turbine wheel size, and housing configuration specific to Tier-3 emission calibration. The 900°C maximum exhaust gas temperature rating defines the thermal envelope the turbine housing and bearing system are engineered to sustain continuously. OE-spec gaskets included with the unit ensure the turbine flange and oil port seals match the mating surfaces without requiring separate procurement.

What a Mismatched Variant Costs on Site

A turbo that physically bolts on but has the wrong compressor outlet angle forces field modification of the charge air plumbing, introducing leak paths and restriction points that degrade boost delivery. A unit with incorrect oil port clocking may install with forced hose routing that restricts drain flow, leading to oil pooling in the center bearing and premature seal failure. The cost is never just the replacement part — it is the second teardown, the extended machine downtime, and the downstream damage from a turbo that ran incorrectly before it failed outright [NEED_CITE: consequences of incorrect turbocharger variant installation on diesel engine reliability].

Why This Source Reduces Fitment Risk

Our own production lines and qualified sourced supply carry identical QC and warranty terms under one account, so you do not manage separate quality standards across turbo batches. Eight product categories under a single order mean the gaskets, oil lines, and air filters for the same job ship in one consignment. Part identification works from a part number, machine model, photograph, or nameplate image — whichever is the only thing you have available. Cross-reference verification covers superseded and alternate numbers including discontinued references, so a legacy number like 4038597R is mapped to its correct current equivalent. Sample supply for fitment confirmation is available before any bulk commitment, and our technical team confirms variant and grade suitability against your specific engine build.

Documentation & Verification

• Commercial invoice listing HX35W variant code and applicable cross-reference numbers (reference only)
• Fitment sheet mapping your engine serial to confirmed port orientation and flange pattern
• Dimensional inspection record covering turbine flange, compressor outlet, and oil port positions
• Warranty terms document specifying coverage period against manufacturing defects
• Packing photographs showing gasket inclusion and protective packaging before dispatch
• HS code classification and customs documentation support for international shipment

Fitment Check Before Installation

• Compare turbine housing flange bolt pattern against the exhaust manifold mating surface before mounting
• Verify oil feed and return port clocking matches existing hose routing without forced bends
• Confirm compressor outlet diameter and orientation aligns with charge air pipe connection
• Check wastegate actuator bracket configuration against the existing mounting point on the engine block
• Trial-fit the unit without gaskets first to verify full clearance before final assembly

Before You Send the Inquiry

Share your engine serial number, machine model, and a photograph of the existing turbocharger nameplate or oil port layout. This allows us to cross-reference the correct HX35W variant and confirm interface compatibility before quoting. If only the machine model is legible, that is enough for us to begin the identification process.

Frequently Asked Questions

Q: How do I confirm this HX35W turbocharger fits my specific engine serial range? A: Provide your engine serial number and we map it against the applicable HX35W variant build window, confirming turbine housing configuration, port orientation, and actuator bracket geometry match your specific production run. Serial range verification eliminates the guesswork that cross-reference tables alone cannot resolve.

Q: My old part number is 4038597R — is it still valid or has it been superseded? A: That reference has been superseded through multiple revisions. We cross-check 4038597R against the current equivalent number and verify the replacement unit matches your engine build variant, including oil port clocking and flange pattern. The superseded number alone is sufficient for us to begin identification.

Q: Why do multiple replacement numbers appear for the same turbo? A: Numbers like 4955156, 5452082, and 4042667 represent different production revisions, application-specific variants, or remanufacturing reference codes within the HX35W family. Each may correspond to a slightly different compressor trim, housing configuration, or port layout. We verify which number applies to your exact engine serial range.

Q: I only have the machine model, not the part number — can you still identify the correct unit? A: Yes. Share the machine model and any available engine information, and we cross-reference the applicable HX35W variant for that equipment platform. A photograph of the existing turbocharger or nameplate accelerates the process when original part markings are worn or painted over.

Q: Can I order one sample to verify fitment before placing a bulk order? A: Single-unit sample orders are available specifically for physical fitment confirmation. Install the sample on one machine, verify every interface matches, then commit to fleet or distributor quantities with confidence. This eliminates the risk of an entire batch arriving with a variant mismatch.