SANY Main Bearing Bolt 61000084 – High-Strength Fastener for D12/D09
61000084
Main Bearing Bolt
Болт главного подшипника
Tornillo del cojinete principal
🔧 Secure your engine’s rotating assembly with genuine SANY parts – the OEM high-strength fastener 61000084 (Main Bearing Bolt). This precision‑engineered bolt is specifically designed to clamp the main bearing caps to the cylinder block in SANY D12 and D09 heavy‑duty diesel engines. The 61000084 main bearing bolt provides superior clamping force, vibration resistance, and long‑term reliability. When rebuilding your engine, using this genuine SANY bolt guarantees proper bearing clearance, consistent preload, and extended service life in demanding construction, mining, and heavy transport applications.
The 61000084 Main Bearing Bolt is a critical fastener within the SANY Engine Block Group. It secures the main bearing caps to the cylinder block, ensuring precise crankshaft alignment and proper oil clearance. The SANY D12 engine, jointly developed with DEUTZ, has a displacement of 12.12 liters and six cylinders.
The D12 engine delivers 360 kW (490 hp) at 1,900‑2,100 rpm, with a maximum torque of 2,150 Nm. This high‑output engine requires main bearing bolts with exceptional tensile strength and fatigue resistance. The 61000084 is typically a property class 10.9 or 12.9 bolt.
It sustains clamp loads that keep bearing caps firmly attached even under peak cylinder pressures exceeding 180 bar. The D12 engine meets Euro VI emission regulations through its 1,800 bar common‑rail injection system. Its low idle speed of 525 rpm reduces component wear.
The 61000084 is a torque‑to‑yield fastener, stretched beyond its elastic limit during tightening to achieve precise preload. These bolts must be replaced every time they are removed. The recommended procedure is a two‑stage process: first torque to a lower value, followed by an angle‑torque step (e.g., 90°).
The bolt is manufactured from high‑strength chrome‑molybdenum alloy steel. The threads are rolled, not cut, to improve fatigue strength and prevent stress risers. The hexagon flange head distributes load evenly without a separate washer.
A zinc flake or black oxide coating resists corrosion from engine oil and environmental exposure. Aftermarket bolts often lack these critical features, leading to premature loosening or breakage. Installation follows a precise sequence from the center main bearing outward.
A thin film of engine oil on the threads ensures a consistent friction coefficient. The torque‑to‑yield angle provides a predetermined stretch, maintaining clamp force under dynamic loads. This design has been validated through thousands of field hours.
The D12 engine is widely used in SANY truck mixers, dump trucks, pumps, excavators, and port machinery. Main bearing bolts are subjected to continuous vibration and cyclic loading. The 61000084 maintains clamp force without loosening.
Aftermarket bolts may have inconsistent heat treatment, leading to sudden failure. A failed main bearing bolt is catastrophic. Symptoms include a deep knocking sound, low oil pressure, metal debris in the oil, and excessive crankshaft end‑play.
Replace the 61000084 at every engine overhaul, regardless of appearance. Torque‑to‑yield bolts cannot be reused. Using new genuine SANY bolts is cheap insurance against a major engine failure.
Why the 61000084 Main Bearing Bolt Ensures Engine Rotational Integrity
High Strength Grade
The 61000084 is property class 10.9 or 12.9, delivering 1000‑1200 MPa tensile strength. This ensures sufficient clamping force to keep main bearing caps secure under peak cylinder pressures of 180 bar.
Torque‑to‑Yield Design
The 61000084 is stretched permanently during installation, providing precise and consistent preload that remains stable under dynamic loads. No re‑torquing is required after the first heat cycle.
Rolled Threads
Rolled threads work‑harden the surface and eliminate stress risers, increasing fatigue strength by up to 30% compared to cut threads. This is essential for components under cyclic tensile loads.
Genuine SANY Traceability
Each 61000084 is part of SANY’s certified parts system, with batch traceability and hardness verification. Aftermarket bolts may have incorrect hardness or thread geometry, leading to unpredictable clamp load.
Technical Specifications – Main Bearing Bolt 61000084
The role of main bearing bolts in engine integrity: The SANY D12 engine’s crankshaft is held by main bearing caps, each secured by two bolts. The 61000084 bolts are torqued to stretch into the plastic region. This stretch creates consistent clamp load that does not relax under vibration or thermal expansion.
Every component within the SANY Engine Block Group, including the 61000084, undergoes rigorous quality control. Bolts are 100% inspected for hardness and tensile strength. For major overhauls, always use new genuine SANY bolts. Reusing old bolts can cause insufficient clamp load, leading to bearing cap movement, oil pressure loss, crankshaft flex, and catastrophic engine failure.
Installation requires clean and lubricated threads. Clean bolt holes with a thread chaser (not a tap). Apply a thin film of clean engine oil to threads and bolt head underside. Hand‑tighten, then torque in sequence using a calibrated wrench. Finally, apply the angle‑torque using an angle gauge.
Common mistakes: reusing old bolts, failing to clean bolt holes (causing hydraulic lock), overtightening (yield and break), or undertightening (insufficient clamp load). Always use a new 61000084 for each assembly. After installation, no periodic re‑torquing is required.
For severe conditions, inspect main bearing bolts only by checking the cap for movement. Since removal destroys them, replace at every overhaul. If an engine suffered a main bearing failure, replace all main bearing bolts, as they may have been overloaded.
Applications of Main Bearing Bolt 61000084
- SANY Kingway 435 Heavy Trucks
- SANY SYZ324C-8 / SYZ425C‑8 Dump Trucks
- SANY SYZ432C-8 / SYZ436C‑9S Dump Trucks
- SANY SKT105 Mining Dumpers
- SANY Concrete Mixer Trucks
- SANY SY / SYH Series Excavators
- SANY Truck‑Mounted Pumps
- SANY D12 / D09 Series Diesel Engines
Bolt failure symptoms and replacement criteria: A failed main bearing bolt is rare but catastrophic. Symptoms include a deep knocking sound from the lower engine, sudden loss of oil pressure, metal flakes in the oil, and crankshaft end‑play exceeding specification. Replace the 61000084 at every engine overhaul. Never reuse a torque‑to‑yield bolt.
Aftermarket bolts may have incorrect hardness or thread geometry, leading to unpredictable clamp load. Always use genuine SANY bolts and follow the torque and angle specifications in the service manual. If a bolt is found loose during service, replace the entire set.
To verify authenticity, inspect the bolt head for the SANY logo and property class marking (10.9 or 12.9). Genuine bolts have a consistent hex shape, uniform thread finish, and traceable batch code. Aftermarket bolts often lack markings or have rough hex corners.
When ordering, provide your engine serial number (ESN) and model. The 61000084 is a standard main bearing bolt for D12 and D09 engines. Typically, each engine uses 14 bolts (2 per cap for 7 main bearings). Purchase the exact quantity for a complete rebuild.
- 61000084 – Main Bearing Bolt (this item)
- A210405000002 – Washer (used with some main bearing bolts)
- 160102130004A042 – Main Bearing Group
- 160102130004A041 – Crankshaft Group
- 160102130004A027 – Crankcase Assembly
- 160102130003A005 – Hexagon Flange Bolt (other fasteners)
- Clean bolt holes with thread chaser (not a tap)
- Apply light engine oil to threads and bolt head underside
- Use new genuine SANY 61000084 bolts (never reuse)
- Hand‑thread bolts to avoid cross‑threading
- Torque in sequence to first stage (e.g., 100 N·m) using calibrated wrench
- Apply final angle torque (e.g., 90°) using angle gauge
- Verify each bolt has been turned the specified angle
- Do not re‑torque after engine run‑in
Genuine SANY 61000084 – High‑Strength Fastening for Crankshaft Integrity.
Torque‑to‑yield main bearing bolt with rolled threads, property class 10.9/12.9, and corrosion‑resistant coating. Designed for SANY D12/D09 engines in trucks, dumpers, mixers, and construction equipment. OEM‑certified, 12‑month warranty, full batch traceability.
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