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Lister SR2 pumps / governor


TeHoro

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Hi Folks

 

I acquired this Lister SR2 a while back as a project (my late father was a marine engineer which might have something to do with it).

 

It was previously in a boat, but was swapped out and put into storage about a decade ago.

 

I've changed the oil and worked out how to connect everything up (it came with an original manual luckily) but it won't start up.

 

My current suspicion is the speed control / fuel rack as it doesn't seem to move when the start/stop control is rotated, or when the speed control is pulled out.

 

I have taken out one injector and there is no fuel coming up from the pump when cranked. The fuel lines have been bled as far as the screws on the top of the pump.

 

Any hints on where to go from here?

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  Remove the injector pipes and check the delivery valves at the top of the pump unit, by removing  the big hexagon below the Injector pipe nut.  Keep everything immaculately clean. Remove the spring and put it in clean diesel, remove the valve itself and put it in clean diesel.  Crank engine with full throttle set.  Fuel should come out of where the valves were.  If OK reassemble.  Keep everything immaculately clean.  Do not wipe any part with a rag.  The pumps  should now produce fuel at the injector end of the pipes   Fit injector to pipe and crank.  Injector should spray a fine mist of fuel. Reassemble and check the timing.

 

 

If no fuel with valves out. Refit valves and check  Is the rack free?  It should be at the full fuel position with the engine stopped. You should be able to move it one way to the stop position against the governor spring.  If it is not free then either something is stuck or the governor is assembled incorrectly.

If it is free then the pump elements are stuck.

 

Disconnect the governor link and check at the pumps.  If the pumps are stuck you need a specialist to dismantle then and probably renew the elements.  If the pumps are OK investigate the governor.

 

N

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With a stationary engine the rack should set itself to the maximum speed position so no fuel at the injector suggests:-

 

1. No fuel supply (I can't see a test fuel tank) and the lift pump looks to be missing in one photo.

 

2. The injector pumps have not been bled but yours seem to be a self bleeding system. I think it would need a fair bit of cranking to self bleed.

 

3. The rack is jammed and that is easy to achieve if great care is not taken to get the individual pump racks lined up. On SL4s we used to fit the pumps but not tighten them down. The work the rack by hand and gradually tighten to ensure the rack was free when the pumps were tight.

 

4. The stop control is jammed, holding the rack in the no fuel position.

 

5. The governor has jammed in the no fuel position for some reason.

 

Can't help any more, no practical work on SR2 fuel systems.

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3 minutes ago, BEngo said:

  Remove the injector pipes and check the delivery valves at the top of the pump unit, by removing  the big hexagon below the Injector pipe nut.  Keep everything immaculately clean. Remove the spring and put it in clean diesel, remove the valve itself and put it in clean diesel.  Crank engine with full throttle set.  Fuel should come out of where the valves were.  If OK reassemble.  Keep everything immaculately clean.  Do not wipe any part with a rag.  The pumps  should now produce fuel at the injector end of the pipes   Fit injector to pipe and crank.  Injector should spray a fine mist of fuel. Reassemble and check the timing.

 

 

If no fuel with valves out. Refit valves and check  Is the rack free?  It should be at the full fuel position with the engine stopped. You should be able to move it one way to the stop position against the governor spring.  If it is not free then either something is stuck or the governor is assembled incorrectly.

If it is free then the pump elements are stuck.

 

Disconnect the governor link and check at the pumps.  If the pumps are stuck you need a specialist to dismantle then and probably renew the elements.  If the pumps are OK investigate the governor.

 

N

 

Thanks - I can't slide the rack in either direction no matter what I do with the controls.  It does jiggle by 1 mm or so so isn't completely stuck. Looks like it is all the way to the right, is that full fuel?

 

Disconnect the governor via the pin circled?

 

@Tony Brooks I do have the lift pump installed, and a fuel tank. One of the photos is from a week ago.

Capture.JPG

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1 hour ago, TeHoro said:

Disconnect the governor via the pin circled?

Yes, though my memory is getting a bit hazy about the details of the SR/SW.  The governor is in the casing behind the lever down and to the left of your circle.

 Don't adjust the connection in the middle between the two pumps.  It controls the synchronisation of output between the two pumps.

 

N

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3 hours ago, TeHoro said:

 

Thanks - I can't slide the rack in either direction no matter what I do with the controls.  It does jiggle by 1 mm or so so isn't completely stuck. Looks like it is all the way to the right, is that full fuel?

 

Disconnect the governor via the pin circled?

 

@Tony Brooks I do have the lift pump installed, and a fuel tank. One of the photos is from a week ago.

Capture.JPG

If the rack will only move 1mm then it would appear that the pumps are gummed up with stale fuel. You will need to get the rack moving freely before you attempt to start the engine. You could try a little gentle force which will do no harm. There is nothing further forward that would stop the rack moving. 

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  • 2 months later...

OK, so a follow up, I had the injectors and pumps serviced. The shop said the injectors were frozen shut, which is probably why it wouldn't run.

 

I got it back together this evening, and....

 

  • Greenie 1
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  • 2 years later...
On 10/03/2021 at 09:14, BEngo said:

 

 

 

If no fuel with valves out. Refit valves and check  Is the rack free?  It should be at the full fuel position with the engine stopped. You should be able to move it one way to the stop position against the governor spring.  If it is not free then either something is stuck or the governor is assembled incorrectly.

If it is free then the pump elements are stuck.

I just signed up to say thankyou for this invaluable advice, I have an SR2 running a genset and I couldn't for the life of me work out why she wouldn't fire up (I've only ever worked on modern CR and PD diesels in cars, so was clueless about older diesels). Seems that the fuel rack was stuck in the stop position (not been run for 10+ years). Once that was freed up she sprang to life. Thanks again to you and all who contributed to this thread.

  • Greenie 1
  • Happy 1
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