Operators and maintenance shops know that engine longevity depends on precision. If you are performing a top-end rebuild on a Yanmar or Komatsu 4D94E engine, sourcing the exact part number 129901-22080 (12990122080) is critical to restoring factory compression and performance. This 94mm piston kit, paired with the 129901-22050 piston pin, ensures a seamless fit for heavy-duty industrial applications.
Accurate identification of engine parts prevents costly downtime. Below is the technical breakdown for the 4D94E and 4D98E series components.
| Engine Model | Cylinder Bore (mm) | Piston Part Number | Piston Ring Set | Piston Pin Number | Pin Dimensions (mm) |
|---|---|---|---|---|---|
| 4D94E / 4D94LE | 94 | 129901-22080 | 129901-22050 | 129901-22050 | 30 * 73 |
| 4D94E / 4D94LE | 94 | 129931-22100 | 129901-22050 | 129901-22050 | 30 * 73 |
| 4D98E / 4D98LE | 98 | 129903-22081 | 129903-22050 | 129903-22050 | 30 * 72 |
We provide OEM Standard Replacement kits designed to meet the rigorous demands of construction and agricultural machinery. Whether you need a single piston or a complete 4-set liner kit, our stock is ready for immediate dispatch.
| Critical Sourcing Factors | OEM Standard Replacement | Common Aftermarket Parts |
|---|---|---|
| 1. Material Density | High-silicon aluminum alloy for heat resistance | Variable quality, prone to expansion |
| 2. Precision Machining | Matches 129901-22080 exact specs | May require manual adjustment |
| 3. Pin Fitment | Includes 129901-22050 with 30*73mm tolerance | Loose pin fit causing engine noise |
| 4. Ring Groove Life | Hardened grooves for friction reduction | Standard grooves, shorter service life |
| 5. Thermal Stability | Tested for 4D94E high-load cycles | Higher risk of piston scuffing |
| 6. Availability | In Stock / Fast Dispatch worldwide | Often backordered or long lead times |
Model NO.: 4D94E / 4D94LE Engine
Product Name: Engine Rebuild Kit / 4-Set Liner Kit
Part Number: 129901-22080 (12990122080), 129901-22050 (12990122050)
Condition: Brand New, OEM Standard Replacement
Application: Engine rebuild, overhaul, maintenance for excavators, forklifts, and generators
Stock Status: In Stock / Fast Global Shipping
MOQ: 1 Piece / 1 Set
Payment: T/T, Western Union, MoneyGram
Delivery: DHL, Fedex, UPS, EMS, Air, or Sea Freight
This is often caused by worn piston rings or a scored cylinder liner. Replacing the old pistons with 129901-22080 units and fresh rings will restore the oil seal and stop oil consumption.
No. The 4D98E has a 98mm bore, while the 4D94E uses a 94mm bore. Installing the wrong part will cause immediate engine failure. Always verify your part number (e.g., 129901-22080) before ordering.
Answer: Our kits utilize an OEM-standard tri-metal structure for bearings and high-grade alloys for pistons. These are trusted by repair shops and equipment fleets globally for their durability and exact fitment.
Not sure how this issue affects your equipment? Our team helps operators troubleshoot and maintain peak efficiency.
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Don't risk your engine with generic parts. Ensure the health of your machine with verified components.
We specialize in heavy-duty engine solutions, supplying high-quality components for Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, and Weichai engines. Our inventory covers everything from full engine assemblies to specialized internal components.
Our core business focuses on high-demand search terms including: Cylinder Liner Kits, Piston Ring Sets, Crankshaft Main Bearings, Con-rod Bearings, Thrust Washers, Full Overhaul Gasket Kits, Diesel Injection Pumps, Fuel Injectors, Forged Crankshafts, Turbochargers, Water Pumps, Oil Pumps, Engine Cylinder Blocks, Cylinder Heads, and Connecting Rods.
With a focus on long-term reliability, we provide solutions for: 4D94E engine rebuild parts, Yanmar excavator overhaul kits, Komatsu forklift engine maintenance, heavy equipment diesel engine repairs, and industrial generator parts supply.
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