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Engine Piston Ring Set For NT855 Engine
The oil control ring is installed in one of the carrier's outer grooves. When installing the two-part oil control ring, be sure to pay attention to the position of the helical expander. The end of the helical expander must always be opposite the ring joint.
The piston ring plays a crucial role in ensuring a proper seal between the piston and the cylinder wall, preventing gas from entering the crankcase. Additionally, it transfers heat from the piston head to the cylinder, which is then dissipated by the coolant and air. The piston ring also helps to prevent oil from entering the combustion chamber, ensuring efficient heat transfer. Its excellent elasticity and high strength allow it to maintain its function for many years.
Heat Conductivity:
Diesel combustion generates high heat, which is transferred to the cylinder wall through the piston ring, effectively cooling the piston. The piston ring dissipates heat to the cylinder wall, accounting for over 30% of the heat absorbed by the piston head.
High Sealing:
The primary function of the piston ring is to maintain a tight seal between the piston and cylinder walls, minimizing air leakage. This is primarily achieved through the air ring, which controls the leakage of compressed air and gas to a very low limit under any working condition, improving thermal efficiency. The piston ring also prevents air leakage between the cylinder and piston or between the cylinder and piston ring, as well as preventing failures caused by deteriorating lubricating oil.
Support:
The piston is designed to be slightly smaller than the inner diameter of the cylinder, which would cause instability and hinder free movement without the piston ring. The ring not only prevents direct contact between the piston and cylinder but also provides support. As a result, the piston ring moves up and down in the cylinder, with its sliding surface entirely borne by the ring.
Improve the Engine Efficiency:
Proper sealing and lubrication are crucial for engine efficiency and lifespan. The piston rings must maintain a tight seal between the piston and cylinder walls to prevent air leakage and improve thermal efficiency. They also help to transfer heat from the piston to the cylinder wall, which is essential for cooling the piston and preventing engine damage. Additionally, the rings must control the amount of oil that enters the combustion chamber to prevent excessive oil consumption and reduce emissions.
Product Parameter：
|
Product Name |
Engine Piston Ring |
|
Application |
Diesel Engine Parts |
|
Engine Number |
NT855 |
|
Material |
Steel |
|
Size |
STD |
|
OEM Number |
3801056 4089810 |
|
Application |
Forklift, Tractor, Excavator, Skid Steer Engines |
|
Payment Way |
T/T, L/C, Paypal, Western Union, UPS |
|
Car Model |
Cummins |
Installing and removing piston rings
Carefully clean the used piston to remove any dirt stuck to it. In particular, make sure that the ring grooves are free of carbon and dirt. If necessary, clean the drain hole with a drill or other suitable tool.
Do not damage the sides of the grooves when removing the carbon. The bottom groove side is the sealing area. Damage from scraping can lead to high fuel consumption or increased blow-by emissions during engine operation.
Always use piston ring pliers to install and remove piston rings. Other tools, such as wire rings or screwdrivers, can damage the piston rings and piston.
Never pull the ring by hand (exception: double bevel oil control ring with steel cup segment). There is not only the risk of breaking, bending, and being subjected to excessive strain but also of injury if the ring breaks or due to sharp ring edges.
Notice
Pulling the piston ring quickly by hand without breaking it can demonstrate the skill of the mechanic, but usually, also damage the piston ring during the installation phase.
Never pull the ring past the piston. If the ring is bent and no longer lays flat in the groove, it will no longer rotate in the groove, one side will wear out, or it will no longer seal properly. However, for molybdenum-coated rings, the molybdenum layer peels or breaks. If the loss of the sliding layer did not occur during installation, it certainly did during engine operation. The sliding layer loosens, damaging the piston and cylinder, and the piston erodes the cylinder bore as hot combustion gases blow between the piston and the cylinder wall. Loose parts can cause damage to piston and cylinder sliding surfaces.
Avoid pulling the piston rings unnecessarily. The ring bends slightly each time it is installed. For example, don't take off the rings of pre-assembled pistons to measure them.
Pay attention to the installation order of the rings: install the oil control ring first, then install the second compression ring, and then install the first compression ring.
Installation steps
Observe the installation markings. "Top" means that this side must point upwards towards the combustion chamber. If you are not sure or there is no "top" mark, attach the ring to the ring.
Check that the ring is free (turning) to rotate in the ring groove.
Check that the ring disappears completely in the ring groove over the entire ring, i.e. the sliding surface of the ring must not protrude on the piston skirt. This is important because, without the fundamental clearance of the groove (incorrect ring or groove alkali carbonization), the ring function cannot be guaranteed.
When installing the two-part oil control ring, be sure to pay attention to the position of the helical expander. The end of the helical expander must always be opposite the ring joint.
With a three-part ring, the correct position of the expansion spring is critical to ensure oil scraping function. Always check the position of the expander spring before piston installation, even when using pistons with pre-assembled rings. During transport, the screw ends are not tightened and can slide against each other. Both color markers at the ends of the helix must be visible. If they are not visible, the helices have overlapped and the loops have no effect. All ring joints of the three-part oil control ring (two rails and expander springs) must be oriented 120° away from each other.
Turn the piston ring fittings of the ready-to-install pistons so that the ring fittings are turned approximately 120° from each other. This helps the piston or piston ring during the first engine start. Reason: The compression ratio is slightly lower when the engine is first started because the piston rings have not yet worn in. Turning the joint ends toward each other prevents too much blow-by on the first engine start, resulting in a poor engine start.
