HX40W Turbocharger 2839811 4089917 – Cross-Reference for Cummins

Verified Cross-Reference — we map superseded turbocharger numbers to the exact Cummins QSL build before dispatch

Technical Specifications

Application Suitability

Why 19 Part Numbers Point to One HX40W Turbocharger Base

The HX40W turbocharger for Cummins QSL ISL ISC8.3 cross reference fitment is not a single part — it is a family of variants sharing a base model designation but differing in oil port position, flange pattern, and housing orientation.

Buyers often search using the number stamped on a failed unit, only to discover that number has been superseded two or three times across engine generations. I have seen orders placed against 2839811 arrive on a bench and sit there because the oil inlet faces the wrong direction for that specific QSL serial range. The cross-reference list above covers alternate and superseded numbers, but a number match alone does not guarantee the HX40W variant will bolt on without modification [NEED_CITE: Cummins turbocharger variant identification by engine serial range]. Each replacement must be confirmed against the engine build record, not just the part number stamped on the old housing.

Serial Range Verification Across QSL, ISL, and ISC8.3 Builds

The HX40W turbocharger for Cummins QSL ISL ISC8.3 cross reference fitment starts with the engine serial, not the part number. Cummins QSL engines produced between 2004 and 2011 span multiple build configurations, and the turbocharger variant shifted mid-production. An ISL from an early build year may require a different compressor housing orientation than a later ISC8.3, even though both appear under the same base turbo model. We pull the build record for your serial range and confirm which variant — HX40W or HX40W-B85J71GL/C76L84FH18UD-W — your engine actually requires before the unit leaves the warehouse.

Oil Port Position and Flange Pattern Confirmation

The most common fitment failure with this turbo family is oil port misalignment. The inlet and drain ports on the bearing housing must match the engine block gallery exactly; even a slight rotational difference in the center housing assembly means the oil feed line will not reach or will kink under vibration. The mounting flange bolt pattern also varies between early and late QSL builds, with some variants using a different gasket profile. Every HX40W turbocharger for Cummins QSL ISL ISC8.3 cross reference fitment we ship is checked against your engine model and serial to confirm port clock position, flange bolt spacing, and gasket surface profile match the original installation [NEED_CITE: turbocharger oil port alignment standards for heavy-duty diesel engines].

Reading HX40W Turbocharger Specifications for Fitment

The HX40W designation refers to the Holset 40-series frame size, which governs the turbine wheel diameter and compressor inducer size. The suffix string — such as B85J71GL — encodes the compressor trim, turbine trim, and housing A/R ratio, all of which determine how the turbo spools and at what exhaust flow rate it reaches target boost. A mismatched A/R ratio will not prevent physical installation but will cause sluggish response or excessive backpressure at operating RPM. The center housing rotating assembly balance is calibrated for the specific wheel combination in that variant, so swapping wheels between housings without rebalancing introduces vibration that shortens bearing life. These are the parameters we cross-check when confirming which variant your QSL or ISC8.3 engine requires.

The Cost of Shipping the Wrong Variant

A turbocharger that physically bolts on but has the wrong oil port clock position creates an immediate decision on the shop floor: fabricate an adapter line or send it back. Adapter lines introduce kink points and restrict oil flow to the bearing assembly, which is the fastest path to a turbo failure within the first hundred hours. A return and re-order cycle means the machine sits idle through another shipping interval, and if the unit was already torn down expecting the replacement to arrive correct, the teardown labor is spent twice [NEED_CITE: cost of unplanned equipment downtime in construction operations]. Confirming the HX40W variant against the engine serial before shipping eliminates this cycle entirely.

What Sets This Supply Apart

We run our own production on selected lines and source the remainder from qualified ISO-certified partners, both carrying identical QC and warranty terms. Eight product categories under one account mean the turbocharger ships alongside any gaskets, oil lines, or air filters the same repair requires. Minimum order is one piece — no MOQ blocking a single emergency replacement. Our Guangzhou warehouse holds stock on fast-failure items for rapid dispatch. Part identification works from a part number, machine model, photograph, or nameplate image when the stamping is illegible. Cross-reference verification covers superseded and alternate numbers across the full Cummins QSL, ISL, and ISC8.3 range. We supply samples for fitment confirmation before any bulk commitment. The technical team confirms compatibility and variant grade before order confirmation.

Documentation & Verification

• Commercial invoice and packing list with turbo model variant clearly stated
• Part compatibility sheet listing verified cross-reference numbers for your engine serial (reference only)
• Quality inspection record covering housing dimensions and port orientation
• Warranty terms covering manufacturing defects for 3-12 months
• Packing photographs documenting protective wrapping before crate closure
• HS code and customs documentation support for international shipment

Fitment Check Before Installation

• Compare oil inlet and drain port clock positions against the removed unit before unbolting the old turbo
• Verify mounting flange bolt spacing and gasket surface profile match the original
• Check compressor housing orientation relative to the intake plumbing route on your machine
• Inspect oil feed and return lines for kinks or restrictions that may have caused the previous failure
• If any dimension or port position does not match, halt installation and contact us with photographs

Send Us Your Engine Details for Fitment Confirmation

Provide your Cummins engine model (QSL, ISL, or ISC8.3), the engine serial number, and the part number stamped on the failed turbocharger — even if that number appears on the superseded list above. If the nameplate is worn or painted over, send a photograph of the engine data plate or the old turbo housing and we will identify the correct HX40W variant from the machine model alone.

Frequently Asked Questions

Q: How do I confirm which HX40W variant fits my Cummins QSL/ISL/ISC8.3 engine? A: Share your engine serial number and we pull the build record to identify the exact turbo variant required. The base HX40W model comes in multiple configurations with different oil port positions and flange patterns, so serial-level verification is the only reliable method. We confirm the match before shipping.

Q: My old turbo has a superseded part number — is the current replacement a direct fit? A: Superseded numbers are mapped in our cross-reference table, but a direct number swap is not always sufficient. Cummins changed turbo variants mid-production across several QSL serial ranges. We verify your specific engine build to ensure the current equivalent is physically compatible with your oil ports and mounting flange.

Q: Why are there 19+ part numbers for what looks like the same turbocharger? A: Cummins issued new numbers for each engineering revision, production year change, and application variant of the HX40W. These revisions can involve differences as small as a gasket profile change or as significant as a rotated center housing. All 19 numbers are tracked in our cross-reference system and resolved against your engine serial.

Q: I only have the engine model, no readable part number — can you still identify the right unit? A: Yes. Send us the engine model and serial number, or a photograph of the engine data plate. We use the build record to determine which HX40W variant was installed at the factory. Even with a completely illegible nameplate, the machine model alone is often enough to narrow down the correct fitment.

Q: Can I get a sample to verify fitment before placing a larger order? A: Sample supply is available for fitment confirmation. You receive one unit to test-fit on the engine, verify oil port alignment and flange match, and confirm compatibility before committing to a bulk purchase. This is standard practice for workshops standardizing turbo replacements across a mixed fleet.