Turbo HX35W Turbocharger 4038597 – OE Interchange for Cummins QSB6.7

Verified Cross-Reference — Every listed interchange number for 4038597 has been checked against QSB6.7 engine serial variants.

Technical Specifications

Application Suitability

Why the Same Turbocharger Number Ships in Four Variants

The base designation HX35W covers multiple compressor and turbine wheel configurations, and only the full suffix string guarantees fitment.

Buyers holding a worn nameplate with 4038597 often discover the replacement arrives with oil inlet ports rotated or a different compressor housing clocking. The QSB6.7 platform evolved through multiple emission tiers and power ratings since 2004, and each shift can change turbine trim or wastegate calibration [NEED_CITE: turbocharger variant differentiation across engine serial ranges]. A turbocharger HX35W 4038597 for Cummins QSB6.7 cross reference fitment requires matching the full model string HX35W-A77J70GM/A70Q86FE14PB-W, not just the base number. When the nameplate is illegible, the engine serial and equipment model become the starting point for identification.

Fitment Range and Serial Verification

The HX35W turbocharger serves the QSB6.7 and broader QSB Tier-3 family across industrial, truck, and grader applications. Cummins assigned different turbo configurations depending on the rated power output and emission calibration. Identifying the correct unit from 18 cross-reference numbers — including superseded numbers like 3802879 and remanufactured suffixes like 4955156RX — means tracing each number back to the specific engine build. A Turbocharger HX35W 4038597 for Cummins QSB6.7 cross reference fitment is confirmed only when the engine serial falls within the verified range.

Interface and Port Orientation Checks

Before committing to an order, compare the oil supply port position, oil return flange size, compressor inlet diameter, and exhaust outlet flange bolt pattern against the removed unit. The HX35W-A77J70GM/A70Q86FE14PB-W variant carries specific clocking angles for intake and exhaust connections. Even a correct part number can fail installation if the variant suffix differs. Photographs of the old turbo from multiple angles — especially the oil port side and mounting face — allow dimensional comparison before shipment [NEED_CITE: turbocharger clocking and port orientation verification procedures].

Spec Interpretation for the HX35W Platform

The HX35W designation refers to the compressor wheel diameter class and bearing housing type used across mid-range industrial diesels. The A77J70GM segment of the full model number identifies the compressor trim and inducer geometry, which directly affects boost pressure at a given engine speed. The turbine side, coded A70Q86FE14PB-W, defines the turbine wheel trim and wastegate spring calibration. Together these determine the airflow map the turbocharger delivers to the QSB6.7 combustion system. Mismatching either side means the engine runs outside its intended boost curve, leading to elevated exhaust gas temperatures or sluggish transient response.

The Hidden Cost of a Variant Mismatch

A turbocharger that physically bolts on but carries the wrong compressor trim will run, yet deliver incorrect boost under load. The operator notices power loss at high altitude or under full throttle, and the diagnosis often circles back to the turbo weeks later. Return freight on a mismatched unit, plus the second round of machine downtime while the correct part ships, turns a simple swap into a costly delay [NEED_CITE: cost of equipment downtime from incorrect aftermarket part fitment]. Fitment verification before dispatch eliminates this cycle.

Sourcing Confidence for This Turbocharger

Identification from a part number, machine model, or photograph means buyers are not forced to guess. Cross-reference verification covers superseded and remanufactured suffixes — 4038597R, 4955156NX, 5452082RX and others — so discontinued numbers map to the correct current replacement. A sample unit can ship for fitment confirmation before bulk commitment. The technical team confirms variant compatibility against the engine serial. Self-produced lines and sourced supply both carry the same warranty terms, so the account and documentation stay unified across categories.

Documentation & Verification

• Commercial invoice listing full turbo model suffix and cross-reference numbers applied
• Cross-reference sheet mapping each alternate number to verified QSB6.7 engine serials (reference only)
• Dimensional check on port spacing and flange bolt pattern before dispatch
• Quality inspection record covering rotor balance and wastegate calibration
• Packing photographs showing protective crating and port caps installed
• HS code provided for customs clearance at destination

Fitment Check Before Installation

• Compare oil inlet and return port positions against the removed HX35W unit
• Verify compressor inlet diameter and exhaust flange bolt circle match
• Check wastegate actuator rod length and bracket orientation before bolting on
• Inspect oil supply line and drain hose for restriction that caused the previous turbo failure
• Rotate the compressor wheel by hand to confirm free spin and no contact
• If port clocking differs, contact us before installation to confirm variant exchange

Request a Fitment Confirmation

Provide the equipment model, engine serial number, or clear photographs of the existing turbocharger nameplate and oil port layout. Our team will return a verified cross-reference match and confirm whether 4038597, 4955156, or another listed number maps to your specific QSB6.7 build. For first-time orders, request a sample unit to validate fitment before releasing a bulk quantity.

Frequently Asked Questions

Q: How do I confirm this turbocharger fits my Cummins QSB6.7 or Komatsu equipment? A: Send the engine serial number and equipment model plate photo. We cross-check the serial against the verified fitment range for HX35W-A77J70GM/A70Q86FE14PB-W and confirm port orientation, flange pattern, and wastegate calibration match your specific build.

Q: What is the difference between numbers like 4038597R and 4955156RX versus the base number? A: Suffixes such as R, RX, and NX typically denote remanufactured or exchange program designations in the original numbering system. Our new aftermarket unit maps to these references for identification purposes and delivers the same fitment and performance envelope as the current replacement specification.

Q: Are 4038597, 4955156, and 5452082 fully interchangeable? A: These numbers share the HX35W platform but may represent different production phases or engine power ratings. We verify each against your engine serial to confirm whether the compressor trim, turbine trim, and port configuration align with your specific QSB6.7 variant.

Q: The nameplate is worn and I can only see the machine model — is that enough? A: Yes. Provide the equipment model, year, and any visible engine data plate information. We trace from machine specification to the correct turbocharger variant and return a fitment confirmation with the applicable cross-reference numbers for your records.

Q: Can I order one sample to check fitment before placing a bulk order? A: A single sample unit ships with full documentation for trial installation. Once fitment is confirmed on your machine, the bulk order follows with identical specifications and matching warranty coverage across all units.