How to Adjust the Valve Clearance of a Silent Diesel Generator

Jul. 04, 2022

The silent diesel generator set is suitable for special occasions requiring low noise, such as schools, hospitals and high-level elevator apartments. The noise of the unit is greatly reduced, so that it can meet the relevant environmental protection requirements. In the process of using the silent diesel generator, in order to ensure the stable performance of the unit, Tingbo Electric reminds you that you must regularly check and adjust the valve clearance. Check and adjust during secondary maintenance to make it meet the technical requirements.


The valve clearance of the silent generator is divided into two types: the upper type and the lower type. It generally refers to the appropriate clearance reserved between the tail end of the valve rod and the valve transmission mechanism when the cold valve of the silent diesel generator is closed. The valve clearance is usually checked and adjusted in the cold state. The size of the valve clearance has a great influence on the performance of the silent diesel generator in all aspects:


1. The clearance is too small. In the hot state, the silent diesel generator may cause the valve to leak due to the expansion of the valve stem, resulting in a decrease in power and even burning out the valve.


2. The gap is too large. It is easy to collide between the transmission parts and between the air setting valve and the valve seat. At the same time, the duration of the valve opening is reduced, and the intake and exhaust rings are sufficient, which will directly affect the normal operation of the silent diesel generator.


How to Adjust the Valve Clearance of a Silent Diesel Generator


Adjustment method of valve clearance for silent diesel generator:


1.First remove the valve cover, then shake the crankshaft so that the piston is at the top dead center position of the compression stroke (the top dead center line of the flywheel is aligned with the line on the water tank), and close the decompression device. Insert a thickness gauge between the rocker arm head and the valve stem end and measure the gap.


2. However, when the valve rocker arm head has a dimple, when adjusting the valve clearance, adjust the valve in the specified order until the valve has no clearance, and return the corresponding approximate clearance ring of the adjustment screw according to the pitch of the valve adjustment screw and the required valve clearance. number. This method is more accurate than specifying thickness. For multi-cylinder diesel engines, adjustments should be made in sequence according to the working order and valve arrangement;


3. When the car is hot, the intake valve clearance is 0.25 mm, and the exhaust valve clearance is 0.3 mm. If it does not meet the specified value, adjust it.


4. When adjusting the valve clearance, first loosen the lock nut, and use the screw to turn the adjusting bolt until the clearance is suitable. Re-top the adjustment bolt and tighten the lock nut. Then double check that the gap is suitable.


5. It is worth noting that it is necessary to measure the valve clearance when the car is hot and cold, and compare the measured value with the technical specified value. Generally, the intake valve clearance is 0.35 mm and the exhaust valve clearance is 0.4 mm when the car is cold. The adjustment of the valve clearance is an important task in the maintenance and repair of the diesel generator set. In order to ensure the normal operation of the silent diesel generator, all users must adjust the valve clearance.


Guangxi Dingbo Power Equipment Manufacturing Co., Ltd is a diesel generator manufacturer in China, who only focuses on high quality generator sets with competitive price in order to provide suitable product to customers. We have China Cummins generator, Volvo, Perkins, Yuchai, Shanchai, Ricardo, Weichai, MTU etc. The power range is from 25kva to 3000kva. Welcome to contact us by email dingbo@dieselgeneratortech.com. We will work with you.


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