Crankshaft Rear Oil Seal 6151‑21‑4150 For 6D140 6D125 Engine

Keywords: 6151‑21‑4150 crankshaft rear oil seal, 6D140 rear crankshaft seal, 6D125 engine rear main oil seal, Komatsu excavator engine sealing part, construction machinery spare parts, aftermarket crankshaft rear oil seal

Product Overview

Crankshaft Rear Oil Seal Part No.6151‑21‑4150 is critical rear‑end sealing component, compatible with 6D140 and 6D125 diesel engines widely fitted on Komatsu excavators and heavy construction machines. It installs at the rear end of crankshaft between engine block and flywheel housing, stops engine lubrication oil leaking from crankcase, and prevents dust, water and external contaminants from entering inside engine. This replacement seal fixes common issues including rear crankshaft oil seepage, heavy oil leakage, flywheel housing oil contamination caused by sealing lip abrasion, rubber aging and spring fatigue under long‑term high‑temperature heavy‑load operation. Manufactured strictly following OEM dimensional standard for engine repair and overhaul.

Detailed Specifications

Key Features & Advantages

• Exact OEM inner‑outer diameter and thickness, perfect fit for 6D140 / 6D125 crankshaft and flywheel housing mounting position.
• High‑quality composite sealing material, outstanding oil‑resistance, heat‑resistance and lip wear‑resistant property.
• Maintain stable sealing performance under high‑temperature and crankshaft high‑speed rotation, resist rubber aging and permanent deformation.
• Effectively resolve rear crankshaft oil leaking fault, avoid engine oil loss and flywheel‑clutch assembly oil pollution damage.
• Every oil seal passes dimension and visual inspection before factory delivery.
• Indispensable sealing spare part for crankshaft rear‑end service and full engine overhaul project.

Application Scope

Fit Equipment: Komatsu excavators and heavy construction machinery powered by 6D140, 6D125 diesel engine ‑ Widely used for machinery repair shops, equipment fleet maintenance and engine overhaul projects.

Our Company Advantage

We are professional supplier of full‑range construction machinery spare parts, supplying hydraulic parts, engine parts, electrical parts, seal kits and complete overhaul kits. ‑ Large ready stock for various machinery spare parts ‑ Factory‑direct wholesale competitive price ‑ Mixed‑order & one‑stop spare‑parts procurement supported ‑ Professional part‑number matching technical support service

Packaging & Shipping

Independent dust‑proof plastic bag packaging to avoid surface scratch during transit ‑ Export‑grade outer carton for safe sea and land transportation ‑ Multiple shipping options: sea freight, air freight, international express for small trial orders ‑ Export documents such as Commercial Invoice, Packing List can be provided.

Contact Us

If you need more excavator spare parts or other construction machinery replacement components, please send your parts list to us. We will offer our best quotation for you quickly.