When your heavy-duty machinery faces downtime due to engine wear, finding the exact fit is critical for operational safety. The 8136-51-5121 (also known as 8136515121) is a precision-engineered main bearing designed specifically for the Komatsu S6D155 series engine. As a dedicated supplier of high-performance engine components, we ensure that our replacements meet or exceed OEM standards to restore your equipment's compression and smooth rotation.
Whether you are performing a scheduled maintenance or an emergency engine overhaul, choosing the right supplier for your Komatsu engine components determines the lifespan of your crankshaft and engine block.
| Detail Field | Product Information |
|---|---|
| Part Number | 8136-51-5121 / 8136515121 |
| Product Name | Engine Main Bearing (Standard Size) |
| Brand Compatibility | Komatsu |
| Engine Model | S6D155, SA6D155, S6D155-4, SA6D155-4 |
| Machine Models | D155A-1, D155A-2, D355A-3, D355A-5 Bull Dozers |
| Condition | Brand New, OEM Standard Replacement |
| Material | Heavy-Duty Tri-Metal Alloy |
| Stock Status | In Stock / Fast Global Dispatch |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | DHL, Fedex, EMS, UPS, Air Cargo, Sea Freight |
| Purchasing Core Factors | Standard Market Bearings | Our OEM-Standard Bearings |
|---|---|---|
| 1. Fatigue Resistance | Variable quality, prone to premature peeling | Superior tri-metal structure for high load capacity |
| 2. Dimensional Precision | May require manual adjustment or fitting | Strict 8136-51-5121 clearance tolerance compliance |
| 3. Heat Dissipation | High friction risk under extreme load | Optimized oil film retention for cooling efficiency |
| 4. Engine Lifespan | Short-term fix, potential crankshaft damage | Protects crankshaft journals for long-term use |
| 5. Inventory Availability | Long lead times for specialized Komatsu parts | Ready to ship immediately from central stock |
| 6. Technical Support | Generic sales without technical knowledge | Expert advice on Komatsu engine rebuild procedures |
Our team helps operators achieve maximum uptime through specialized insights:
Identify potential risks: Spotting early signs of bearing wear before a catastrophic engine failure.
Recommend suitable replacements: Ensuring the 8136-51-5121 matches your specific engine serial number.
Professional Support: We provide both inspection advice and a stable parts supply chain for your fleet.
Q1: What are the symptoms of worn 8136-51-5121 main bearings in a D155A bulldozer?
A1: Common signs include a significant drop in oil pressure when the engine is warm, metallic knocking sounds from the lower engine block, and the presence of copper or silver-colored metal flakes in the oil filter during maintenance. Replacing these with our high-quality bearings restores oil pressure stability.
Q2: Can I use 8136515121 for S6D155 engines in generator sets?
A2: Yes, as long as the engine model is S6D155, this part number is the correct specification for the main crankshaft support. It is designed to handle the constant RPM requirements of power generation applications.
Q3: Why Choose This Main Bearing?
A3: Our product features an OEM-standard tri-metal structure, ensuring high durability under extreme pressure. It is trusted by professional repair shops and heavy equipment fleets worldwide for its reliability and perfect fitment.
Q4: How fast can you ship the 8136-51-5121 to North America?
A4: We utilize Express services like DHL and Fedex, which typically deliver within 3-5 business days from our stock facility to your doorstep.
Our company specializes in providing complete engine assemblies and high-precision replacement parts for world-leading brands. We are a one-stop solution for maintenance professionals seeking quality and speed.
Core Brands Covered: Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, Weichai, and more.
Main Product Lines: Cylinder Liners, Pistons, Piston Rings, Crankshaft Main Bearings, Connecting Rod Bearings, Thrust Washers, Full Overhaul Gasket Kits, Fuel Injection Pumps, Injectors, Crankshafts, Turbochargers, Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods.
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