Camshaft Bearing Set for Isuzu 4HK1 6HK1 Hitachi ZX240-3 ZX330-3 – Verified Fitment

Verified Variant Fitment — Cross-reference mapping confirms correct camshaft bearing set selection across 4HK1 and 6HK1 engine serial variants before dispatch.

Technical Specifications

Application Suitability

Why the Same Base Number Maps to Multiple Camshaft Bearing Set References

Superseded references and engine variant splits mean one physical bearing position can carry several valid part numbers.

In the Pearl River Delta workshop circuit, I have watched a correct-looking Camshaft Bearing Set for Hitachi ZX240-3 ZX330-3 / Isuzu 4HK1 6HK1 cross reference sit on the bench because the outer diameter matched but the oil feed port alignment was off by a few millimetres. The cross-reference tables that get copied between sellers rarely distinguish between 4HK1XASA and 4HK1XKSA builds, yet the bearing shell width and port position differ enough to cause abnormal clearance once assembled [NEED_CITE: Isuzu 4HK1 and 6HK1 engine variant bearing journal specifications]. When the machine is already stripped down, discovering a fitment mismatch at installation stage turns a planned rebuild into an extended downtime event.

Coverage Across ZAXIS Generations and Engine Serial Ranges

This Camshaft Bearing Set spans the full range of Hitachi ZAXIS machines fitted with Isuzu 4HK1 and 6HK1 powerplants, from the ZX200-3 series through to ZAXIS 5N and 6N generation units. The coverage includes wheel-type excavators like ZX170W-3 and ZX360W-3 alongside standard crawler models. Identifying the correct set requires more than the machine model plate — the engine serial determines which variant within the 4HK1 or 6HK1 family is installed, and bearing dimensions shift across those sub-variants.

Oil Port Position and Journal Diameter Verification

The critical fitment check for this bearing set centres on oil feed port alignment relative to the block gallery and the journal inner diameter tolerance. Across the 6HK1XQA03 and 6HK1XZSA-01 builds, the port clocking position rotates between variants. A bearing installed with the port misaligned starves the camshaft journal of lubrication on first start [NEED_CITE: camshaft bearing oil feed alignment requirements in heavy-duty diesel engines]. I always recommend matching the old bearing shell port position photograph against the replacement before pressing the new set into the block. Requesting a sample unit for physical comparison eliminates guesswork when migrating from a superseded reference number.

Reading the Cross-Reference Map Without Getting Trapped

The published reference list for this Camshaft Bearing Set includes numbers that have been superseded across production runs — 8973861890 gave way to 8973861891 in later engine builds, while 8943903110 and 8943903111 represent an earlier generation that cross-references into the same journal position on specific 4HK1 variants. These numbers are provided for cross-reference identification purposes only. Treating every listed number as interchangeable without checking the specific engine serial and build code leads to ordering a set that physically fits the bore but fails on clearance or oil feed geometry.

The Cost of Installing a Mismatched Bearing Set

When a bearing set matches the bore diameter but carries the wrong port position or shell width, the engine may start and run briefly before abnormal noise develops. I have seen a 6HK1 rebuild returned to the bay within the first week because the replacement bearings matched the old part number but that number itself had been logged incorrectly during a previous overhaul. The cost compounds — a second teardown, fresh gaskets, lost machine availability, and a customer relationship under strain [NEED_CITE: diesel engine rebuild rework costs from component mismatch]. A dimensional check and sample trial before committing to fleet quantities prevents this cascade.

Sourcing With Fitment Certainty

Our own production lines and qualified sourced supply operate under one account and one warranty, so whether this bearing set comes from in-house tooling or a certified partner, the QC terms remain consistent. Eight product categories under a single supplier mean the complete overhaul list — bearings, gaskets, piston sets, seal kits — ships as one consignment. We hold stock in Guangzhou for fast-moving references and supply samples for fitment confirmation before you commit to bulk overhaul quantities. Part identification works from a part number, machine model, photograph, or nameplate image. Cross-reference verification covers superseded and alternate numbers, and our technical team confirms compatibility and grade before dispatch.

Documentation & Verification

• Commercial invoice listing each bearing reference with cross-reference notation
• Dimensional inspection record covering shell width and oil port position
• Part compatibility sheet mapping your engine serial to the correct variant
• Warranty terms covering manufacturing defects for 3-12 months post-installation
• Packing photographs showing bearing set condition before crate closure
• HS code and customs documentation prepared for international shipment

Fitment Check Before Installation

• Compare oil feed port position on new bearing shells against removed originals before pressing in
• Measure journal inner diameter on each shell to confirm it matches the engine serial specification
• Check bearing shell width against block bore depth to prevent protrusion or recess errors
• Photograph the old bearing markings and send them for cross-reference verification if numbers are unclear
• Trial-fit one set on the first engine in a fleet batch before committing remaining sets

Requesting a Fitment-Verified Quote

Provide the excavator model, engine serial number from the block plate, and a photograph of the old bearing markings where readable. If the nameplate is worn or painted over, the machine model alone gives us a starting point for variant identification. This information lets us confirm the exact bearing variant and cross-reference your existing part number against the full supersession chain before you commit to an order.

Frequently Asked Questions

Q: How do I confirm this bearing set fits my specific ZAXIS machine? A: Share the machine model and engine serial number from the block plate. We cross-reference the engine build code against the variant list — 4HK1XASA, 6HK1XQA, 6HK1XZSA and others each map to specific bearing dimensions. When the plate is unreadable, a photograph of the old bearing shell and its markings lets us verify the correct set.

Q: My old part number is not listed — is there a superseded replacement? A: Several numbers in this range have been superseded across engine production runs. Send us your existing reference and we check the supersession chain against current production. The cross-reference list here covers the most common transitions, but less common regional variants may require a dimensional comparison or sample unit for confirmation.

Q: Why do the same engine models appear with several different bearing references? A: Isuzu assigns different bearing specifications across 4HK1 and 6HK1 sub-variants based on journal diameter, shell width, and oil port position. A 6HK1XQA03 and a 6HK1XZSA-01 share the same base engine family but require distinct bearing sets. The engine serial and build code determine which variant applies to your machine.

Q: Can I order one set as a sample before committing to a bulk overhaul order? A: Yes. A single set ships as a sample for fitment trial on your first engine. Once you confirm port alignment, journal fit, and shell width match the application, we fulfil the remaining quantity from the same production batch for dimensional consistency across the fleet.

Q: I only have the excavator model, not the engine number — can you still identify the right part? A: The machine model narrows the field to a short list of possible engine variants. A photograph of the engine block, the old bearing, or any remaining data plate helps us pinpoint the exact build. In many cases the model and production year combination is sufficient to confirm the correct bearing set.