Author Topic: Lister Genset hunting  (Read 217 times)

kingfisk

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Lister Genset hunting
« on: June 16, 2017, 06:50:57 AM »
Hi
Last year I bought a second hand F G Wilson 3 phase genset powered by a Lister LPW3A081.
I live in a humid area, the fuel tank is metal. When first delivered it started well and then very soon smoked out and stalled. The transport had shaken up the fuel with water (and rust) at the bottom of the tank.
I replaced fuel and oil filters, oil and flushed the fuel tank, installed a water trap...all seemed well for several months using for an average of 4hrs pw a couple of hours at a time running a 3 phase table saw.
The engine now starts straight off and runs ok till warm and then starts to hunt, up to 400 rpm around the rated 1500rpm. It will hunt for 5-10 seconds then settle down for 10-15 seconds and then start hunting again.
I have replaced all fuel lines from tank to the fuel filter inlet, replaced the lift pump fuel filter and water trap filter.
The engine continues to hunt.
Does anyone suggestions to probable and /or possible causes and their remedies?

F G Wilson 12kva 3 phase build date 1998 rated rpm 1500
Cheers Richard

dieselgman

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Re: Lister Genset hunting
« Reply #1 on: June 16, 2017, 12:04:30 PM »
There are a few possible causes... does your unit have an electronic throttle control installed? If so, then the electronic controller or the actuator could be at fault. I have seen those become erratic and go in and out of synch.

Given the history with fuel contamination, you could have a fuel injection pump becoming sticky internally. Swapping out pumps is sometimes the only way to confirm if they are erratic in operation. It only takes one of the pumps with an issue to cause the whole system to lose stability.

The stock mechanical governors are sometimes very fussy and touchy on that model... also difficult to diagnose because all parts are internal and you cannot observe them directly during actual operation. In that year, the civilian models had mostly plastic governor sleeves. Those can wear and get sticky. The rack control lever can also develop a catch, look for any rough or worn area around the shutdown slider. They also used plastic bushings at key wear points... many possible places for wear to cause a gradual decay in function.

dieselgman
Ford Powerstroke, Caterpillar 3304, Cummins M11, Too many Listers to count...

kingfisk

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Re: Lister Genset hunting
« Reply #2 on: June 18, 2017, 06:43:08 AM »
Thx dieselgman
Not electronic throttle control.

I did not mention that the hunting happens even when the engine is started and run without any loads (if that may make a difference to diagnosis).
Cheers