Correct Installation Method of Diesel Engine Output Components 2

This article continues to introduce the correct installation method of engine output components for the generator set manufacturer.

3. Common clutch faults

Clutch slippage: The slippage phenomenon is mainly manifested in that the torque cannot be fully output when the engine is working, the load - carrying capacity becomes worse, the clutch friction plate often shows signs of burning, and in severe cases, it is very difficult to start. The main reasons are as follows: the free travel of the clutch release pedal is too small, the clearance between the release bearing and the release lever is too small, there is oil or burning and delamination on the friction plate surface, and the elastic force of the pressure spring is insufficient.

Incomplete clutch disengagement or vibration: The main reasons are as follows: the free travel of the pedal is too large, causing the friction plate to be in a semi - contact state. The elastic force of the release spring is too soft, broken, or uneven. For a double - disc clutch, the limit screws of the intermediate pressure plate are not adjusted properly. The driven disc is installed upside down. There are faults in the hydraulic master cylinder and the power - assisted hydraulic working cylinder of the hydraulically operated clutch.

Abnormal noise in the clutch: The abnormal noise comes from impacts or scratches. The reasons are as follows: the release bearing is damaged and rotates inflexibly, resulting in abnormal noise. The steel plate or rivets of the driven disc are loose or broken, causing impacts. The release lever is worn and loose, the operating transmission system is stuck and inflexible, causing the friction plate to collide during contact. For a double - disc clutch, the wear and looseness of the pin holes of the intermediate pressure plate and the transmission pins will also cause abnormal noise.

Installation of the Engine Flywheel Housing

1. Installation

Install the flywheel housing on the rear end of the diesel engine block. Tighten the bolts crosswise in two steps according to the specified torque, and check the coaxiality between the spigot of the flywheel housing and the crankshaft axis. The method is as follows: Adsorb the magnetic dial indicator base on the large end of the crankshaft, and align the dial indicator head vertically with the spigot of the flywheel housing (the pre - compression amount of the indicator head is 1 - 2mm). Rotate the crankshaft, and the maximum reading of the dial indicator pointer is the coaxiality between the spigot of the flywheel housing and the crankshaft axis. The coaxiality value is required to be ≤ 0.4mm. If it does not meet the requirements, the tightening bolts of the flywheel housing can be loosened for adjustment, then tighten the bolts and measure again. If it still does not meet the requirements, replace the flywheel housing, reinstall it, and measure again.

2. Common faults of the flywheel housing

The common fault of the flywheel housing is cracking at the tightening bolt holes. The main reasons are as follows: Firstly, the wall of the flywheel housing is too thin and does not meet the requirements. Secondly, the coaxiality between the flywheel housing and the crankshaft axis exceeds the tolerance. When the crankshaft bearing is worn, the engine vibration can easily break the flywheel housing. Thirdly, there are faults in the supporting chassis, causing large engine vibrations. This must be noted during the maintenance process.

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