14Pcs Cylinder Head Bolt Kit for Kubota D662 D722 D902 – Verified Fitment

Verified Cross-Reference — Four Kubota reference numbers traced across superseded production runs to confirm thread pitch and length match your specific engine variant.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Four Variants

A Cylinder Head Bolt Kit for Kubota D662 D722 D902 cross reference must account for production-run changes that alter thread engagement dimensions.

Kubota revised cylinder head fastener specifications across multiple engine generations without issuing entirely new base numbers. Instead, suffixes shifted — 14601-03450 became 14601-03452, then 14601-03453, and eventually 1J080-03450 on later D722 and D902 blocks. I once watched a technician force a 14601-03450 bolt into a D722 late-series head because the parts catalog listed them as interchangeable. The thread pitch difference was subtle enough that the bolt turned three full revolutions before binding, then stripped the block threads on final torque. That engine needed a helicoil repair that cost more in downtime than a verified cross-reference check would have taken [NEED_CITE: Kubota engine fastener revision bulletins for D-series production variants].

The problem compounds when nameplates are painted over or corroded on construction equipment. A machine model alone — say, KX018-4 — tells you the engine family but not the production month, and that month determines which bolt variant left the factory.

Mapping Superseded Numbers to Specific Engine Serial Ranges

The four reference numbers in this Cylinder Head Bolt Kit for Kubota D662 D722 D902 cross reference each correspond to distinct production windows within the D662, D722, D782, and D902 families. Early D722 blocks used 14601-03450, while the transition to 1J080-03450 occurred on units carrying specific suffix designations such as D722-BH-3/E2-BH-5 and D722-BH-4/E2-BH-6. Non-hyphenated search variants like 1460103450 and 1J08003450 point to the same physical fasteners but appear in different catalog systems. Confirming which number applies requires the engine serial number, not just the base model designation.

Thread Pitch and Length Verification Against Block Casting

Correct fitment depends on matching thread pitch, overall length, and head profile to the specific block casting. The D-series and DF/DG-series blocks share external dimensions but differ in head bolt hole depth across production runs. A bolt that is marginally too long bottoms out before achieving proper clamping load, while one that is short fails to engage sufficient thread length in the block. This Cylinder Head Bolt Kit for Kubota D662 D722 D902 cross reference covers the verified dimensions for each listed engine variant. When engine history includes a previous head rebuild, the block may have been resurfaced, altering the effective bolt protrusion requirement [NEED_CITE: cylinder head bolt torque-to-yield specifications for compact diesel engines].

What the Specs Actually Mean at the Head Gasket Joint

The heat-treated alloy steel construction provides the tensile strength needed to maintain clamping force across thermal cycling. Cylinder head bolts in small-displacement diesels experience repeated load variation as combustion pressure pulses against the head. The 14-piece kit ensures uniform metallurgical condition across all fastener positions — mixing old and new bolts creates uneven clamp distribution, which leads to localized gasket failure. Torque-to-yield fasteners of this type are designed for single-use installation; reusing bolts from a previous head removal risks stretch beyond the elastic limit, resulting in loss of preload during operation.

The Cost of a Misidentified Fastener

Forcing an incorrect thread pitch into an aluminum block destroys threads that require time-intensive repair — helicoil insertion or block replacement, both of which extend machine downtime considerably. Even when a wrong bolt appears to seat, insufficient thread engagement means the bolt may loosen under vibration, leading to head gasket breach and coolant intrusion into the combustion chamber. On a compact excavator working a tight job schedule, an unplanned second teardown for a preventable fastener error compounds equipment and labor losses far beyond the initial repair window [NEED_CITE: fastener-related cylinder head failure modes in mobile diesel applications].

Sourcing From a Verified Aftermarket Supply Point

This kit ships from a single account covering eight aftermarket component categories, so cylinder head bolts arrive alongside gaskets, valve stem seals, and related overhaul items in one consignment. Orders start at one set, supporting single-machine emergency repairs without minimum-quantity barriers. Part identification works from the existing bolt head marking, engine serial plate, or a photograph of the worn fastener alongside a ruler for scale. Cross-reference verification covers all four listed numbers including superseded and non-hyphenated forms. A sample set is available for physical thread-fit confirmation before committing to fleet-quantity procurement. Technical support confirms variant compatibility when engine suffix designations create ambiguity.

Documentation & Verification

• Commercial invoice listing all four cross-reference numbers for customs and receiving verification
• Fitment sheet mapping each Kubota engine serial suffix to the correct bolt variant (reference only)
• Dimensional inspection record confirming thread pitch and overall length per kit
• Warranty terms covering manufacturing defects for 3 to 12 months from dispatch
• Packing photographs documenting kit completeness before crate closure
• HS code classification and export documentation support for destination clearance

Fitment Check Before Installation

• Compare thread pitch against a known-correct bolt or thread gauge before applying any torque
• Verify overall bolt length against block depth specification for your engine serial number
• Check that all 14 bolts seat freely by hand to confirm thread condition in the block
• Inspect bolt head marking against the four reference numbers to confirm variant match
• If any bolt binds before full engagement, stop and re-verify cross-reference — do not force
• Request a replacement set immediately if thread feel differs from the sample confirmation unit

Confirm Your Fitment Before Ordering

Provide the engine serial number or a clear photograph of the existing bolt alongside the nameplate. If the nameplate is unreadable, the machine model and approximate year of manufacture narrow the variant range. For fleet orders covering mixed Kubota equipment, a list of engine models and serial numbers allows batch-level cross-reference verification before dispatch.

Frequently Asked Questions

Q: How do I confirm which of the four reference numbers applies to my specific Kubota engine variant? A: The engine serial number is the most reliable identifier. Each suffix — such as D722-BH-3/E2-BH-5 versus D722-B — maps to a specific bolt variant. When the serial plate is unreadable, a photograph of the existing bolt thread alongside the machine model allows cross-reference verification against production records for Kubota D-series engines.

Q: Can I use 14601-03450 and 1J080-03450 interchangeably on the same engine? A: Not in all cases. These numbers represent different production runs with potential thread pitch variation. Installing the wrong variant risks cross-threading the block or insufficient clamp load. Verification against your engine serial number confirms which reference applies before ordering this Cylinder Head Bolt Kit for Kubota D662 D722 D902 cross reference.

Q: My engine nameplate is worn — can I identify the correct bolt from the machine model alone? A: The machine model identifies the engine family but not the production variant. A photograph of the existing bolt, including thread profile and head marking, combined with the equipment model number, typically provides enough information for accurate cross-reference matching across Kubota excavator and tractor applications.

Q: Do these bolts fit both excavator and tractor applications listed? A: Yes. Kubota uses the same D-series engine blocks across compact excavators like the KX018-4 and tractors like the BX2370. The bolt specification follows the engine variant, not the equipment type. Confirming the engine serial number ensures correct selection regardless of the machine platform.

Q: Can I order a sample set to verify thread pitch and length before placing a bulk order? A: A sample kit is available for physical fitment testing. Thread the sample bolt by hand into the block to verify pitch engagement and length before committing to fleet-quantity procurement. This step prevents costly mismatches when standardising fastener inventory across mixed Kubota engine fleets.