Shangchai (SDEC) G02-112-01+A Upper main bearing bushing

Product Introduction

The main bearing upper bushing (liner) with part number G02-112-01+A is a critical component of the crank mechanism of the 6-cylinder Shangchai (SDEC) G128 series diesel engines. It is designed for installation in the cylinder block bed, providing support and reducing friction for the crankshaft during rotation. This part is specifically designed to operate under extreme loads, high temperatures, and vibrations typical of heavy construction, generator, and truck equipment. Unlike non-genuine alternatives, the genuine G02-112-01+A bearing sleeve guarantees reliable crankshaft support, wear protection, and extended engine life.

Materials and technical characteristics

The main feature of the Shangchai G02-112-01+A main bearing shell is the use of high-quality antifriction materials and precision machining, which gives it exceptional performance properties:

• Base: High strength steel strip with high hardness, providing rigidity and resistance to deformation under load.

• Anti-friction layer: A multi-layer coating based on tin (babbitt) with the addition of copper and nickel, which has exceptional anti-friction properties, high wear resistance and the ability to withstand impact loads.

• Working surface: Precision ground and polished to ensure perfect smoothness, minimal clearance with the crankshaft and uniform distribution of engine oil.

• Design: Special oil grooves and holes for lubrication supply, providing continuous lubrication of the working surface and preventing dry friction.

• Technical Parameters:

• Article: G02-112-01+A

• Type: Upper main bearing bushing

• Quantity per package: 14 pieces (for 7 crankshaft bearings of a 6-cylinder engine)

• Total weight: 2 kg

• Package dimensions: 292×127×42 mm

• Operating temperature: -40°C to 150°C

• Compatibility: Shangchai G128 engines and other models with corresponding parameters.

Each batch of bearings undergoes multi-stage quality control at the SDEC plant, including testing for hardness, geometry, anti-friction properties, and wear resistance, which is confirmed by certificates of conformity.

Scope of application

Main bearing shells G02-112-01+A are designed for installation in the following types of equipment with Shangchai G128 engines:

1. Heavy construction equipment: Bulldozers, excavators, loaders, truck cranes equipped with G128 engines.

2. Generator sets: Diesel generators based on G128 engines, used for backup and permanent power supply.

3. Freight and special transport: Heavy trucks, buses, garbage trucks, fire trucks with G128 engines.

4. Marine equipment: Small vessels, boats and auxiliary marine equipment with G128 diesel engines.

Thanks to their universal design, the liners are suitable for both initial installation on new engines and for replacing worn parts during major overhauls, making them popular with both official SDEC dealers and independent service centers.

Functional purpose

The main function of the Shangchai G02-112-01+A main bearing shell is to provide reliable support and reduce friction for the crankshaft during its rotation, performing the following critical tasks:

1. Friction Reduction: The anti-friction layer minimizes friction between the crankshaft and cylinder block, preventing scuffing, wear and breakage of the crankshaft.

2. Load distribution: Evenly distributes high impact loads from pistons and connecting rods across the entire bearing surface, protecting the crankshaft from deformation.

3. Lubrication: Oil grooves and holes provide a continuous supply of engine oil between the bearing and the crankshaft, creating a hydrodynamic cushion that completely eliminates metal-to-metal contact.

4. Thermal expansion compensation: Precise clearance between the bearing and the crankshaft compensates for thermal expansion of parts at high temperatures, preventing crankshaft seizure.

5. Vibration dampening: The anti-friction layer softens vibrations and shocks from engine operation, reducing noise levels and extending the service life of all crank mechanism components.

Proper operation of main bearings directly impacts engine reliability and service life: wear leads to increased clearance, loss of oil pressure, crankshaft scuffing, and catastrophic engine failure.

Advantages over non-original analogues

Many customers choose non-original G02-112-01+A bearings due to their lower price, but these parts have a number of significant drawbacks compared to the original SDEC product:

1. Poor quality antifriction layer: Non-genuine bearings often use low-quality babbitt with a low tin content, which quickly wears out, flakes off and leads to crankshaft scuffing.

2. Geometry inaccuracy: Analogues often have deviations in size and shape, which leads to uneven load distribution, local overheating and rapid failure.

3. Low Bearing Strength: Non-original bearings are made of low-quality steel, which deforms under load, disrupting the clearance and causing the crankshaft to seize.

4. No warranty: Non-original replacements do not carry an official manufacturer's warranty, and if they fail, the user is responsible for all crankshaft and engine repair costs. Original G02-112-01+A bearings come with an SDEC warranty, confirming their quality.

5. Short service life: Non-original bearings often fail after just 1-2 years of operation, while original parts retain their properties throughout the entire service life of the engine.

Installation and maintenance

Installation of the Shangchai G02-112-01+A main bearing shells must be performed by a qualified technician in accordance with all G128 engine repair instructions. Incorrect installation is the primary cause of bearing failure, so the following steps are recommended:

1. Preparation for installation:

• Thoroughly clean the cylinder block beds and bearing caps from dirt, carbon deposits and remnants of old liners.

• Inspect the crankshaft for wear, scoring, and out-of-roundness. If necessary, resurface the crankshaft and use repair bearings.

• Check new bearings for defects, scratches or damage to the anti-friction layer.

• Lubricate the working surfaces of the crankshaft bearings and journals with clean engine oil before installation.

• Install the upper bearing shells into the cylinder block bed, aligning the oil holes. Important: do not confuse the upper and lower bearing shells.

• Carefully install the crankshaft into the block, ensuring it is in the correct position.

• Install the lower liners into the bearing caps, then install the caps onto the block, aligning the markings.

• Secure the covers with bolts, strictly following the tightening sequence (from the center to the edges, crosswise) and the recommended tightening torque (specified in the G128 repair manual). Tighten in several stages.

• Check the crankshaft end play to ensure it meets specification G128.

• Check the ease of rotation of the crankshaft manually, without jamming or jerking.

• After assembling the engine, start it and check the oil pressure, making sure it is within normal limits.

• Check for any extraneous noise in the crankshaft area when the engine is running.

To extend the life of your bearings, we recommend regularly changing your engine oil and oil filter, using only high-quality oil that meets the SDEC specification, and maintaining your engine's lubrication system.

Conclusion

The Shangchai G02-112-01+A main bearing upper bushing is a critical component of the crankshaft mechanism, ensuring reliable operation of the G128 6-cylinder diesel engines under the harshest operating conditions. Manufactured from high-quality antifriction materials in compliance with all OEM SDEC standards, this genuine bearing shell ensures reliable crankshaft support, wear protection, and a long engine life.

Using non-genuine replacement bearings instead of G02-112-01+A leads to rapid wear, crankshaft scuffing, and costly engine overhauls, while the original SDEC product is an investment in the reliability and durability of the equipment. For companies operating equipment with Shanghai G128 engines, choosing genuine G02-112-01+A bearings is a guarantee of quality, safety, and minimal maintenance costs.

Exhibition cabinets

Getting to know the plant

The plant employs a team of highly qualified and experienced engineers who continuously innovate and improve its products. The company currently holds a number of independent intellectual property rights and patented technologies. Its construction equipment includes a wide range of excavators, loaders, cranes, bulldozers, and other machines. These products are distinguished by their high productivity, reliability, energy efficiency, and environmental friendliness, as well as the ability to adapt to challenging operating conditions in a variety of climates and environments worldwide.

Awards and qualificationsfication

frequently asked questions

1. Which countries do we export to?

Asia: Vietnam, India, Indonesia, Pakistan, Kazakhstan, Uzbekistan, etc.

Europe: Russia, Belarus, Ukraine, Lithuania, Saudi Arabia, etc.

South America: Brazil, Chile, Paraguay, Argentina, and others.

Africa: South Africa, Ethiopia, Libya, etc.

2.What payment terms can we accept?

Usually we can work on T/T, 30% TT before production and 70% TT before shipment

3. What logistics methods can we use for delivery?

1) For most of Europe, South America and Africa etc. countries, we can go by container or Roro via ocean freight.

2) For neighboring countries of China, such as Russia, Vietnam, Kazakhstan, Uzbekistan, etc. we can deliver by road or rail.

3) For light spare parts in urgent requirement, we can ship it by international courier service, such as DHL, TNT, EMS or other air freight.

4. How can you guarantee that you have delivered the goods to customers?

A: We will provide you with full delivery information for you confirmed.

5.What are our advantages compared with other manufacturers/factories?

1) Reliable quality: Carefully select reliable manufacturers to support spare parts such as engines, axles, transmissions, and many parts designed and produced by ourselves, always adopting the best materials.

2) Competitive price: Concentration of mechanized production in large quantities reduces production costs to ensure competitive price.

3) Service Team: Firstly, our sales managers are available 24/7, ready to answer your questions at any time. Secondly, our professional technical support team, with senior technicians, is ready to provide support to users and dealers. Most issues can be resolved within 24 hours.

4) Fast delivery: Generally, we can delivery within 10 working days in factory after receiving the advance payment from customers.

6. How can you provide after-sales service to customers?

A: We will reply you at the first time and help you solve the problems within 24 hours. If we really need your local, we

We will send your professional person to your locality to help you solve the problems without any hesitation, supply you with all-round