Unstable RPM and wandering of the diesel generator

1. Unstable idle: Refers to the phenomenon that diesel generators fluctuate between fast and slow during idle operation, lack regularity, and exhibit tremors. Additionally, the generators are prone to stalling during rapid deceleration, gear shifting, or under load. This issue is often caused by a malfunctioning governor.

The reasons for the analysis of diesel generator rentals occurring mainly include the following.

(1) Flyball Wear

(2)Idle speed spring has decreased elasticity or is improperly adjusted

(3) Incorrect Speed Spring Adjustment

(4) Low-pressure oil supply line clogged or contains water and air

(5) Excessive wear on the cone bearing of the camshaft supporting the injection pump cam

2. "Floating Car": So-called "floating car" refers to the phenomenon of diesel generators showing a periodic and regular alternation between fast and slow speeds within the low and medium speed range. This is the result of the speed control response lagging excessively behind the actual speed changes.

The reasons are mainly as follows.

(1) Internal lever of the speed regulator is loose due to wear on the connecting pin holes

(2) Fuel supply ratchet lacks flexibility

(3) Incorrect Speed Spring Adjustment – Similar to the situation where the speed spring adjustment is incorrect when the idle is unstable, this condition is characterized as "wandering" because the speed spring and the fuel supply rod cannot function together flexibly.