65.02503-8146 Piston Ring for D1146 DE08 Doosan Daewoo Excavators

The 65.02503-8146 piston ring set fits Doosan Daewoo D1146 and DE08 series engines. Operators use these engines in excavators, generators, and various construction machines. RJT PARTS manufactures these piston rings with high-chrome alloy materials. We apply nitriding and chromium-plating treatments to improve durability and performance. The rings match OEM dimensions with high precision. They withstand high temperatures and resist wear in demanding working environments. These piston rings create an effective seal in the combustion chamber. They help control engine oil consumption. They also reduce blue smoke emissions and minimize power loss.The ring set is an ideal solution for engine overhaul and repair projects. It delivers stable performance under heavy-duty operating conditions and helps extend engine service life.

OE Original Part Number: 65.02503-8146
Compatible Engine Models: Doosan D1146, DE08, DE08T, DE08TS, D1146T, D1146TI
Compatible Equipment: Doosan Daewoo excavators, loaders, generator sets, construction machinery, marine power units

Standard Specifications

Cylinder Bore: 111mm (STD Standard Size)
Ring Combination: First compression ring 3.34mm + Second compression ring 3mm + Oil ring 4mm
Structural Configuration: 2 compression rings + 1 combined oil ring, complete set of parts for 6-cylinder engines
Material and Process: High chromium alloy cast iron + nitriding and chrome plating treatment, wear-resistant, corrosion-resistant, high-temperature deformation resistant, precision casting and precision machining

Core Product Advantages

• Original Factory Precision Dimensions
  Strictly conforms to Doosan original factory drawing tolerances, compatible with D1146/DE08 The series of dry-type cylinder liners ensures a high degree of fit, eliminating air leaks and oil smuggling, and effectively restoring engine cylinder pressure and power performance.
• High strength, wear resistance, and durability: The chrome-plated surface strengthens the cylinders, allowing them to withstand the high temperature and pressure conditions of diesel engines. They provide excellent wear resistance. Moreover, they reduce carbon deposits and keep the engine cleaner. As a result, oil consumption decreases significantly. In addition, they help reduce blue smoke and excessive exhaust emissions. Therefore, the engine delivers more reliable performance. Most importantly, they extend overhaul intervals and lower long-term maintenance costs.
• Excellent sealing and oil control performance: The trapezoidal compression ring + coil spring combination oil ring design efficiently seals the combustion chamber, precisely scrapes excess lubricating oil from the cylinder walls, stabilizes the compression ratio, reduces fuel consumption, and improves engine power loss, starting difficulties, and weak idling.
• Stable compatibility across all operating conditions: Compatible with all turbocharged, direct-injection, water-cooled D1146/DE08 engine models, widely used in heavy-duty and harsh conditions such as mining, infrastructure, ports, and generator sets. It maintains stable operation even in high-temperature and dusty environments.

Main Application Scenarios

• Doosan Daewoo series excavators, wheel loaders
• D1146/DE08 diesel generator sets, industrial stationary power equipment
• Doosan engine repair and overhaul for construction machinery, heavy trucks, and ships
• Standard parts for engine overhaul (compatible with pistons, cylinder liners, and piston pin assemblies)

Product Packaging and After-Sales Service

• Packaging: Individual moisture-proof vacuum bags + neutral color boxes packaging, moisture-proof and impact-proof, supports neutral packaging and OEM customization
• Warranty: Standard warranty of 6-12 months, with100% dimensional and appearance inspection before leaving the factory, with factory inspection report
• Minimum Order Quantity: Minimum order of 1 set, readily available stock, standard delivery time of 5-10 working days, supports large-volume FOB orders for foreign trade

For more piston rings, please check below and contact us for details.

I. D1146 / DE08 Series

DE08 Piston Rings

65.02503-8146 (Main Model): Compatible with D1146, DE08, DE08T, DE08TIS, cylinder bore 111mm, DH280, DH300 excavators, generator sets

65.02503-8147: +0.25 enlarged maintenance-grade piston ring

65.02503-8148: +0.50 enlarged maintenance-grade piston ring

II. DB58 / DB58T Series (DH220-5/DH225-7 Bestselling Models)

65.02503-8058: STD standard size, DB58, DB58T engines, cylinder bore 102mm

65.02503-8059: +0.25 Enlarged Piston Rings

65.02503-8060: +0.50 Enlarged Piston Rings

III. DE12 / D2366 Series (DX340, DH420 Large Excavators)
DE12 Piston Rings

65.02503-8236: DE12, DE12T, D2366 Standard Piston Rings

65.02503-8237: +0.25 Enlarged Size

65.02503-8238: +0.50 Enlarged Size

401004-00229: Doosan New DE12TIS Replacement Part Number

IV. DV11 Bus / Generator Set Series

65.02503-8040: Piston Rings for DV11 Engines, Daewoo Buses, and Diesel Generator Sets

V. DL Series New Electronic Fuel Injection Engines (DX (New Excavator Series)

401004-00083: DL06 Engine Piston Rings

401004-00312: DL08 Engine Piston Rings

VI. Small Models DB33 / DB33A (Forklifts, Small Construction Machinery)

65.02503-7025: DB33, DB33A 4-Cylinder Engine Piston Rings