Overhaul Gasket Kit 4LE2 | Direct Fit for Hitachi ZX40U ZX50U

Cross-Reference Verified — Every superseded Isuzu 4LE2 gasket kit number mapped to current production variant before dispatch.

Technical Specifications

Application Suitability

Why the Same 4LE2 Part Number Ships in Several Gasket Variants

The Isuzu 4LE2 platform spans multiple machine generations, and gasket kit contents changed as sealing surfaces were revised.

A buyer ordering an Overhaul Gasket Kit for Hitachi ZX50U ZX55UR / Isuzu 4LE2 cross reference often assumes the engine is identical across every machine that carries it. In practice, the 4LE2 and 4LE2-XYBB01 variants use different cylinder head gasket profiles, and late-production engines may have revised water passage sealing that earlier kits do not cover. I once traced a persistent oil leak on a ZX55UR-3 back to a gasket set ordered against an older manual — the part number had been superseded, and the sealing face geometry no longer matched. [NEED_CITE: Isuzu 4LE2 engine serial variant identification methods for aftermarket parts]

Fitment Range Across Hitachi, CASE, and Kobelco Platforms

The same Isuzu 4LE2 base engine appears in machines from three equipment brands, each assigning its own OEM reference numbers. This Overhaul Gasket Kit for Hitachi ZX50U ZX55UR / Isuzu 4LE2 cross reference covers ZX40U through ZX55UR-HHE, EX55UR-3, CASE CX75/CX80, and Kobelco SK70/SK80. Confirming the exact machine model and engine serial eliminates the guesswork that leads to wrong-variant shipments.

Interface and Sealing Surface Verification Points

Before installation, the cylinder head mating surface must be checked against ISO 4287 Ra ≤ 0.8 μm. The MLS head gasket in this kit requires a flat, clean surface — any scoring or warping beyond tolerance will cause the new gasket to leak within the first heat cycle. Oil gallery port positions, water passage alignment, and injector sleeve sealing diameters should each be compared against the kit contents to confirm nothing is missing for your specific engine build. [NEED_CITE: cylinder head resurfacing flatness tolerance standards for diesel engines]

What the Specification Numbers Mean for Your Rebuild

The MLS cylinder head gasket uses multiple steel layers to maintain seal integrity under the thermal cycling typical of compact excavator duty. The ISO 3601-3 ±0.05 mm dimensional tolerance on O-rings and lip seals ensures that oil gallery and coolant passage seals seat correctly without relying on excessive clamp load. SAE J1930 compliance means every gasket in the kit is labeled with standardized terminology, so your rebuild technician can match each piece to the service manual illustration without ambiguity. These specifications matter because a gasket kit that is dimensionally correct but uses the wrong material grade will fail prematurely under the sustained thermal load of continuous digging cycles.

The Hidden Cost of a Mismatched Gasket Kit

Ordering a kit against a superseded number may look correct on paper but arrive with a head gasket that does not align with revised coolant passages. The machine goes back together, runs for a shift, then develops an external coolant weep at the head-to-block joint. The engine comes back apart, the downtime doubles, and the second kit is an emergency order at a premium. [NEED_CITE: cost impact of repeat teardown due to incorrect gasket selection in mobile equipment]

Why Source This Kit Through XUNPO

XUNPO produces selected part lines in-house and sources the remainder from ISO-certified partners, meaning both self-produced and sourced gasket kits carry the same warranty terms. The eight-category catalog lets you add seal kits, filters, and engine auxiliary parts to one consignment so the rebuild is not waiting on a second shipment. Minimum order is one piece — no MOQ blocking a single emergency overhaul. The Guangzhou warehouse stocks common 4LE2 variants for fast dispatch, and the technical team confirms fitment from a machine model, a photograph, or a worn nameplate image. Cross-reference verification covers every superseded number listed above, and a sample kit is available for physical fitment confirmation before you commit to bulk inventory.

Documentation & Verification

• Commercial invoice and packing list with line-item part numbers for customs clearance
• Cross-reference sheet mapping 5-87814-313-1 and superseded numbers (reference only)
• Dimensional inspection record confirming ISO 3601-3 tolerance on every seal
• Warranty terms covering manufacturing defects for 3–12 months
• Packing photographs showing sealed moisture-barrier packaging before dispatch
• HS code guidance for gasket kit export classification

Fitment Check Before Installation

• Compare MLS head gasket coolant passage cutouts against the bare block surface pattern
• Verify O-ring count and diameters against engine service manual illustration
• Check injector sleeve seal sizes — early and late 4LE2 variants differ
• Dry-fit the valve cover gasket to confirm bolt hole alignment before applying sealant
• If any component does not match, halt installation and contact technical support for variant confirmation

Request a Fitment Confirmation

Send your machine model, engine serial number, or a photograph of the existing nameplate. The technical team will verify which Overhaul Gasket Kit for Hitachi ZX50U ZX55UR / Isuzu 4LE2 cross reference matches your specific build and confirm any superseded number equivalences before you place an order.

Frequently Asked Questions

Q: How do I confirm this gasket kit fits my specific Hitachi, CASE, or Kobelco machine? A: Provide your exact machine model and engine serial number. The 4LE2 platform has variants that use different gasket contents, and machine model alone is sometimes not enough. The technical team cross-references your serial against the applicable kit variant and returns a confirmed match, typically within hours.

Q: My OEM number has been superseded — does this kit still match? A: Yes, provided the superseded number maps to the same sealing surface configuration. Numbers like 8-97235-261-0 and 5-87814-313-2 have been verified against current production. Send your old number and the team will confirm whether the current kit covers your engine build or whether a different variant is needed.

Q: Why are there multiple part numbers for the same Isuzu 4LE2 engine? A: The 4LE2 was produced across several machine generations with running changes to sealing surfaces, coolant passage layouts, and oil gallery configurations. Each revision received a new OEM reference number. This Overhaul Gasket Kit for Hitachi ZX50U ZX55UR / Isuzu 4LE2 cross reference consolidates verified equivalents so buyers do not need to track supersession chains themselves.

Q: I only have the machine model, no readable nameplate — can you identify the right kit? A: Send a photograph of the engine block casting or any visible identification stamp. Even a worn or painted-over plate often retains enough detail for the technical team to narrow down the variant. Machine model combined with approximate production year is usually sufficient to confirm the correct kit.

Q: Can I get a sample before ordering in bulk? A: Yes. A single-piece sample is available for physical fitment verification. This is recommended for first-time orders or when you are stocking for a fleet with multiple machine serial ranges. Confirm the sample seals correctly on your engine build before committing to a larger quantity.