What is the Effect of Valve Lash Size on a Cummins Diesel Generating Set

Diesel generator valve lash is divided into two types of upward and downward, which generally refers to the diesel generator in the cold state of valve closure, in the valve stem end and the valve drive mechanism between the appropriate gap reserved, valve lash is usually in the cold state of the engine to check and adjust.

In the operation process, the size of the valve clearance will affect the capacity of the diesel generator, the valve and valve tube clearance is excessive, will also cause the oil sucked into the combustion chamber. Serious cases often account for 30% of the oil intake into the combustion chamber, the exhaust pipe will emit blue smoke, excessive fuel consumption, diesel generator power shortage. Abnormal impact noise between the driving parts, between the valve and the valve seat.

Cummins diesel generator set valve clearance is too small, it will make the intake valve closure is not strict, the diesel generator in the high temperature state may leakage, caused by the diesel generator power shortage, fuel consumption increases, and sometimes produces the carburetor backfire condition; at the same time will make the exhaust valve closure is not strict, resulting in the diesel generator compression pressure drop, power reduction, fuel consumption increases, and sometimes there is a muffler blasting smoke exhaust pipe situation.

Cummins diesel generator sets in the use of the steps, due to the wear of the valve device parts or adjusting screws loose, the valve clearance will change. Therefore, you must develop the habit of regular valve maintenance. If you find that the valve lash is excessive or too small during the inspection process, you must make adjustments.

Adjustment methods are as follows: first, the cylinder-by-cylinder adjustment method, that is, according to the cylinder ignition sequence, to determine the cylinder piston compression position at the upper stop, you can adjust the cylinder intake and exhaust valve lash; adjust the crankshaft, after the crankshaft, use this method to gradually adjust the valve lash of other cylinders. Secondly, two adjustment paths are used, namely, the memory method of adjustment. Adjustment, while adjusting the screw, the thickness gauge will be inserted into the valve stem end and rocker arm back and forth between the pull, feel a slight resistance is appropriate, and then re-check until appropriate.

Cummins diesel generator injection nozzle is one of the three pairs of precision coupling parts of the diesel generator fuel supply system. Its normal use of time limit in more than a thousand hours. However, due to the use of incorrect methods, often use hundreds of hours, or even dozens of hours on the wear and tear stuck. Diesel fuel is not clean, there are impurities in the high-pressure fuel pipe, Cummins generator crank injector needle valve coupling wear and tear, so that the Cummins generator needle valve coupling closure is not strict, the combustion chamber of high-pressure gas backward, burned needle valve coupling.

In addition, Cummins diesel generator injection pump regulator spring, tappet and other parts of the dirt moved through the Cummins diesel generator injector tappet to the injection pump. Needle valve upper part, or oil used to guard against Cummins diesel generator oil leakage of cotton rope, lead wire through the high-pressure oil pipe into the injector nozzle, will make the Cummins generator needle valve coupling stuck.

Dingbo Power is a manufacturer with 17 years of experience in producing diesel generators. If you would like to learn more about diesel generator sets, do not hesitate to contact us at any time dingbo@dieselgeneratortech.com .