6151‑21‑4150 Rear Crankshaft Oil Seal Diesel Engine Spare Parts

Keywords: 6151‑21‑4150, Rear Oil Seal, Cylinder Block Rear Seal, Komatsu 6D140 Engine Parts, Excavator Diesel Engine Spare Parts, Engine Overhaul Sealing Accessories

Product Overview

The rear crankshaft oil seal 6151‑21‑4150 is an indispensable sealing component installed at the rear end of crankshaft for Komatsu 6D140 diesel engine. It tightly seals the junction between crankshaft and cylinder‑block rear housing, stopping engine lubrication oil leaking out of the crankcase. Meanwhile, it prevents dirt, moisture and impurities from entering engine interior. Replacing hardened, worn‑out or leaking rear oil seal is an essential step during engine overhaul, which solves oil leakage at flywheel housing side and protects the normal operation of clutch and flywheel assembly. This aftermarket replacement spare part is widely used for maintenance, leak repair and full rebuild of Komatsu excavators and heavy‑duty construction machinery powered by 6D140 engine.

Detailed Specifications

Key Features & Advantages

• Exact OEM‑Matching Installation Precision manufactured size and profile, perfectly fits original crankshaft and cylinder‑block rear housing, direct fit without extra machining or modification.
• Premium‑Grade Sealing Rubber Material Excellent oil‑proof, heat‑resistant and anti‑aging performance, maintains stable sealing effect under long‑time high‑temperature and heavy‑load working environment.
• Reliable Long‑Lip Sealing Performance Uniform contact pressure between sealing lip and crankshaft surface, effectively eliminates slow seepage and heavy oil leakage faults.
• Strict Multi‑Step Factory Quality Inspection Every rear crankshaft oil seal goes through dimension inspection, appearance defect check and sealing test before delivery.
• Cost‑Effective Overhaul Maintenance Solution Timely replacement avoids secondary failures including flywheel oil contamination, clutch slip, oil shortage and further costly engine damage.

Application Scope

Compatible Equipment List:

• Komatsu 6D140 Diesel Engine
• Komatsu Excavators, heavy‑duty trucks, generators and construction‑machinery equipment requiring spare‑part No.6151‑21‑4150

Our Company Advantage

We are a professional supplier of comprehensive excavator and heavy‑duty machinery spare‑parts. We provide crankshaft oil seals, full gasket kits, piston ring kits, oil cooler parts, cylinder‑head components, fuel injectors, water pumps, sensors, solenoid valves, hydraulic spare‑parts and engine overhaul kits for Komatsu, cumm-ins, SDEC, Cater-pillar, Kobelco, Hyundai, Hitachi, Doosan, Sany, Isuzu and other well‑known machinery brands.

• Large ready‑to‑ship inventory for engine sealing spare‑parts
• Factory‑direct competitive wholesale price
• Mixed‑order & one‑stop spare‑parts procurement supported
• Professional part‑number matching technical support service

Packaging & Shipping

• Inner sealed plastic bag + foam shock‑absorbing protection, prevent dust, moisture and scratches
• Outer reinforced export carton to avoid damage during long‑distance sea & land transport
• Multiple shipping options: sea freight, air freight, international express for small trial orders
• Export documents including Commercial Invoice, Packing List are available

Contact Us

If you need more Komatsu 6D140 series engine sealing spare‑parts, overhaul accessories or other heavy machinery replacement spare‑parts, please send your parts list over to us. We will offer you our best quotation promptly.