When executing a professional engine overhaul, the precision of the 1J091-21110 (also referred to as 1J09121110) piston is critical for restoring the compression and thermal efficiency of your Kubota D902 diesel engine. Whether you are managing a fleet of mini excavators or maintaining specialized industrial power units, sourcing an OEM standard replacement ensures long-term reliability without the premium markup of local dealerships.
| Detail Field | Product Information |
|---|---|
| Model NO. | D902 / D902-E / D902-EB |
| Part Number | 1J091-21110 / 1J09121110 |
| Product Name | Piston (Engine Internal Parts) |
| Type | Diesel Engine Component |
| Condition | Brand New, OEM Standard Replacement |
| Application | Engine rebuild, overhaul, maintenance |
| MOQ | 1 Piece |
| Stock Status | In Stock / Fast Dispatch |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | Express: DHL Fedex EMS UPS or by Air/ Sea |
| Packaging | Industrial Export Packing |
Choosing the right supplier for your D902 piston impacts the service life of the entire cylinder block. Below is a comparison to help procurement managers make an informed decision.
| Core Procurement Factor | Standard Market Parts | Our 1J091-21110 Replacement |
|---|---|---|
| Material Composition | Basic Aluminum Alloy | High-Silicon Aluminum Alloy (Heat Resistant) |
| Dimensional Accuracy | +/- 0.05mm | +/- 0.01mm (Precision Fit) |
| Ring Groove Treatment | Untreated | Hard Anodized (Wear Resistant) |
| Thermal Expansion Rate | Variable | Low Expansion (Prevents Scuffing) |
| Weight Balance | Inconsistent | Strict Weight Matching for Vibration Control |
| Surface Coating | None | Skirts MoS2 Coated for Low Friction |
The 1J091-21110 piston is designed specifically for the Kubota D902 engine series. This engine is widely utilized in the following equipment:
| Equipment Category | Common Machine Models |
|---|---|
| Mini Excavators | KX018-4, KX41-3, U17 |
| Utility Vehicles | RTV900, RTV-X900 |
| Zero Turn Mowers | ZD323, ZD1211 |
| Compact Tractors | BX2350, BX2360, BX2370, BX24, BX25 |
| Industrial Power | Generators, Light Towers, Scissor Lifts |
Not sure how this issue affects your equipment? Technical failure in the combustion chamber can lead to costly downtime. Our team helps operators:
✔ Identify potential risks during maintenance such as blow-by or oil consumption.
✔ Recommend suitable replacement parts if needed to match your specific engine serial number.
✔ Support both inspection advice and high-quality parts supply for a complete fix.
Get a direct quote for the 1J091-21110 Piston and other D902 overhaul components.
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Question: Why is my D902 engine blowing blue smoke after cold starts?
Answer: Blue smoke often indicates oil passing the piston rings or worn 1J091-21110 pistons. Check for cylinder wall glazing or ring tension loss. Replacing the piston set and rings usually resolves the oil consumption issue.
Question: What causes a "knock" sound in the D902 cylinder head area?
Answer: This can be "piston slap" caused by excessive clearance between the piston skirt and the liner. Using a precision-measured 1J09121110 replacement ensures the correct tolerance is restored, eliminating noise and preventing liner damage.
Question: Why Choose This Piston (1J091-21110)?
Answer: Our parts feature an OEM-standard tri-metal structure and are trusted by repair shops & equipment fleets globally for their durability in heavy-duty cycles.
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