Overhaul Contents Verified — every gasket component in this cylinder head kit is cross-checked against the specific D902 engine serial variant before dispatch.
Technical Specifications
| Parameter |
Value |
| Product Type |
Cylinder Head |
| Part Number |
7247453 |
| Cross-Reference |
7000463, 7247479, 7000464, 7247480 (reference only) |
| Machine Fitment |
Bobcat MT55, MT85 |
| Brand Compatibility |
Kubota, Bobcat |
| Condition |
New Aftermarket |
| Material |
High-silicon aluminum alloy with T6 heat treatment |
| Tensile Strength |
≥260 MPa |
| Surface Flatness Deviation |
≤0.05 mm |
| Mating Face Surface Finish |
Ra ≤0.8 μm |
| Threaded Insert Torque Spec |
18–22 N·m |
| Head Gasket Type |
Multi-layer steel (MLS), embossed stainless steel core |
| Gasket Temperature Resistance |
up to 150°C |
| Hydraulic Pressure Hold Test |
15 bar for 30 min |
| Mounting Bolt Count |
12 |
| Kit Contents |
Cylinder Head, MLS Head Gasket, Valve Cover Gasket, additional gasket components |
| Production Standard |
ISO 9001 |
| Warranty |
3–12 months against manufacturing defects |
| MOQ |
1 piece |
Application Suitability
| Engine System |
Related Components |
| Top-end sealing and combustion chamber |
Valve train assembly, head bolts, injector washers |
| Coolant and oil separation passages |
Thermostat housing gasket, coolant bypass seals |
| Emission and exhaust interface |
Exhaust manifold gasket, EGR cooler seals (if equipped) |
| Fuel delivery mounting points |
Injector sleeve seals, return line washers |
Why Overhaul Kits Fail the First Time
A cylinder head gasket kit ordered as complete arrives missing the exact sealing variant the engine build requires — or the head casting surface finish does not match the block condition from a previous machine pass. The matched set must reflect the actual rebuild state, not just the engine model.
In repair shops across the Gulf, I have watched D902 engines sit torn down for days because the head gasket composition was wrong for a block that had already been resurfaced. [NEED_CITE: engine block resurfacing impact on gasket selection] The assumption that a standard cylinder head gasket kit engine rebuild package fits every serial variant of the same engine family leads to second orders, split freight, and machines that stay on the rack while the correct parts ship. When the mating surface flatness deviates beyond tolerance after a prior overhaul, the compression behavior of the MLS gasket changes fundamentally, and no amount of torque sequence adjustment compensates for that gap.
System-Level Matching Across the Top End
This cylinder head and gasket set addresses the complete top-end sealing system as a matched unit. The casting thermal expansion coefficient is aligned with the D902 block material so that cyclic heating and cooling do not produce differential movement at the mating face. The MLS head gasket relies on uniform clamping across all 12 bolt positions, and any variation in head flatness or surface finish directly undermines that distribution.
Engine Serial Variants and Gasket Composition
Not every Kubota D902 left the factory with the same internal configuration, and subsequent rebuilds introduce further divergence. [NEED_CITE: engine serial variant identification methods for overhaul planning] A block that has been machined during a prior overhaul may require a different gasket thickness to maintain correct compression geometry. Confirming the engine serial number and variant designation — such as D902-E3B-BC-1 versus the base D902 — determines which gasket components belong in the kit and which would cause sealing failure under operating load.
Specifications That Define Rebuild Outcomes
The high-silicon aluminum alloy with T6 heat treatment provides dimensional stability under the thermal cycling typical of compact diesel engines in enclosed engine bays. Surface flatness held to ≤0.05 mm ensures the MLS gasket embossments engage evenly, which is the mechanism that creates combustion seal under bolt preload. The Ra ≤0.8 μm mating face finish allows the gasket coating to grip without micro-movement that would erode the nitrile rubber layer over time. Glow plug and injector threaded inserts are validated to 18–22 N·m, supporting correct reassembly sequence without stripping or under-torque that leads to compression leaks.
The Cost of Missing One Seal
Sending a machine back into service with an incomplete gasket set means the next failure may not appear at the head joint — it shows up as coolant migration into the oil gallery or combustion pressure bleeding past the valve cover. [NEED_CITE: consequences of incomplete top-end gasket sets in diesel rebuilds] The labor to tear down a freshly rebuilt engine for a single missing seal often exceeds the cost of the entire overhaul parts order. Grade mismatch between the cylinder head surface and the gasket compression layer produces early weeping that gets misdiagnosed as a block problem.
What This Supply Chain Delivers
Production on selected lines and qualified sourced supply sit under one account with one warranty structure, so the cylinder head, MLS gasket, valve cover gasket, and associated seals ship as a single consignment rather than arriving from separate vendors on separate schedules. The Guangzhou warehouse holds stock for fast dispatch on common engine platforms. Part identification starts from a number, a machine model, a photograph, or a nameplate image — whichever is available at the point of failure. Cross-reference verification covers superseded and alternate numbers across machine generations. Technical confirmation of compatibility and grade is available before commitment.
Documentation & Verification
- Commercial invoice listing each gasket component by reference number
- Part compatibility sheet showing D902 serial variant coverage (reference only)
- Dimensional inspection record for head flatness and surface finish
- Warranty terms covering manufacturing defects for 3–12 months
- Packing photographs confirming kit completeness before crate closure
- HS code and customs documentation for international engine parts clearance
Installation & Rebuild Sequence
- Verify block mating surface flatness before positioning the MLS head gasket
- Follow factory torque sequence across all 12 mounting bolt positions in stages
- Confirm threaded insert engagement depth for glow plugs and injectors
- Inspect valve cover gasket seating groove for residual material from prior service
- Perform initial coolant pressure hold after assembly to confirm top-end seal integrity
Requesting a Matched Overhaul Quote
Provide the engine serial number and any known rebuild history — including whether the block has been resurfaced or if oversized components were fitted previously. This allows confirmation that every gasket component in the kit matches the actual build state of your D902.
Frequently Asked Questions
Q: What gasket components are included, and which items do other kits commonly omit?
A: This kit contains the cylinder head, MLS head gasket, valve cover gasket, and additional gasket components specific to the D902 platform. Commonly omitted items in generic kits include the injector sleeve seals and specific coolant passage seals that vary between engine serial variants. Each component is listed on the compatibility sheet before shipment.
Q: How do D902 serial variants affect which cylinder head and gasket set is correct?
A: The D902 family includes variants such as the D902-E3B-BC-1, which may differ in coolant passage routing, injector angle, or emission system mounting points. These differences change which gasket profiles seal correctly. Providing the engine serial number allows exact kit composition matching rather than relying on general model coverage.
Q: If the block was resurfaced in a prior rebuild, does that change gasket requirements?
A: Yes. Material removed during resurfacing reduces the deck height, which can alter compression ratio and gasket clamp loading. The MLS gasket thickness or grade may need adjustment to compensate. Confirming the block condition and any prior machining history before ordering prevents a mismatch that causes early seal failure.
Q: What other engine components should be inspected or replaced at the same time?
A: Head bolts should be checked for stretch beyond service limits, as torque-to-yield fasteners lose clamping ability after one heat cycle. Valve stem seals, injector washers, and the thermostat housing gasket are typically replaced concurrently. Inspect the exhaust manifold gasket surface for warpage while the top end is disassembled.
Q: How is engine model confirmed when the nameplate is unreadable?
A: A photograph of the block casting number, the injection pump mounting flange, or any legible stamped identifier on the engine block is usually sufficient for cross-reference verification. The technical team can confirm the D902 variant from these visual markers and match the correct kit contents accordingly.
