Excavator Engine Parts Camshaft MD050140 MD137163 4D102

Engine Parts 6BT Camshaft
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.


FAQ
1Q: How long is the delivery time?
1A: Hot sell items are always in stock.

2Q: How about your product quality?
2A: Our product pass many tests, such as function test, durability test, environment test, engine test etc; and with Iso-9001, Iso/Ts16946 and cnal registered in China.

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5Q: When will ship my order?
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6Q: Which shipping term you can supply?
6A:By sea, By air or by express ( DHL, Fedex, TNT, UPS, EMS)

7Q: How long does it take to my address?
7A: By Express, delivery time is 3-5 days
By Air, usually 4-7days
By sea, ususally 30~40days
Depending on which country you are located.

8Q: I know only the excavator model, but can not offer parts No., what should I do ?
8A: If possible, you can send us the old photo, nameplate or the size for reference.

9Q: How can I do if there is something wrong with the parts ?
9A: First of all , I have confidence in the quality of our products ,if you really found something wrong ,pls provide the old photo for us. After it is confirmed, pls return to us , we will offer the correct item.