In a piston engine, the main bearings are the bearings on which the crankshaft rotates, usually plain or journal bearings. The bearings hold the crankshaft in place and prevent the forces created by the piston and transmitted to the crankshaft by the connecting rods from dislodging the crankshaft, instead forcing the crank to convert the reciprocating movement into rotation.

While some small single-cylinder engines have only one main bearing, designed to deal with the bending moment exerted by the crank as a result of the force from the connecting rod, most engines have at least two main bearings, one at each end of the crank shaft and may have as many as one more than the number of crank pins. Increasing the number of bearings in an engine will generally increase the size and cost of the engine, but also provides stability to the crankshaft, which would otherwise have to endure greater bending moments from having the crank pin further from a bearing. The combination of bearing number and crankshaft design can also have an effect on engine balance; a more stable crankshaft will better avoid unbalance from flexing, but increasing the crankshaft length or girth to accommodate an additional bearing increases the rotational inertia of the crankshaft, which can have the opposite effect.

OEM NO.
3418898
Item Name
crankshaft
Application
K19 Engine Parts
Size
78*29*30 cm
Quality
Genuine and guaranteed
Related Brand
DCEC---4BT/6BT/6CT/6L/ISBE/ISDE/ISLE
CCEC---NT855/K19/K38/K50
BFCEC---ISF2.8/ISF3.8
XCEC---ISM11/QSM11
FCEC---NOX Sensors,Pressure Sensors,Termperature Sensors,Common Raill Sensors,Customized Sensors

Hubei Lianzhong Industrial Co., Ltd was established in 1998, covering an area of 16,666 square meters,and have built an 2,500 square meters office building and 9,000 square meters workshop.

Main products include Diesel Engine,Transmission Gearbox,Axle and Spare parts, which are widely used for light, medium and heavy trucks, medium and high-grade intercity buses, large and medium-sized buses, construction machinery, marine propulsion and auxiliary engines, generator sets and other fields.
We are the franchised dealer of Dongfeng Commercial Vehicle Company Limited for LOONG-GINE Brand Engine and Transmssion Gearbox, and establish long-term strategic cooperative relationship with many top domestic parts manufacturers, continuously improving the competitiveness of enterprises and products, and provide the customers high-quality parts to customer. 

In addition to meeting the needs of customers in the Chinese market, we have business contacts with overseas customers from more than 30 countries around the world, and many of our customers have become our good friends! Our business code: "To serve our customers with excellence in professionalism, prompt action and integrity.