Yorkie064
Member Since: 11 May 2024
Location: Wiltshire
Posts: 9
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I wont bore you with a long winded saga but after my Disco 3 stopped suddenly out of the blue with no on dash faults, it rad ran out of diesel with 1/4 tank showing. I had other issues which pointed to the instrument cluster- now replaced.
I did the usual turning on/off ignition 10+ times and got fuel from the he Schrader valve, but the engine would still not start despite good turn over speed. I inspected the injector pump belt (thats fund to get to isn't it  ) Although the belt was in place the nut holding the LH sprocket on (looking from the rad end) had come off. !!! Heaven only knows. I managed to get this back on an gingerly retightened it. I was concerned that the tension of the belt may have cause some resistance and certainly didn't want any threads stripped. using a cut down 22 ratchet ring I managed to get it tight and felt no restatance so was happy. Unfortunately the engine still will not start. Does any one know the configuration of these sprockets? Obviously one is driven by the engine but which one? and what is connected to the one where the nut fell off. ? looking for issues due to this nit becoming dethatched.
Thanks in anticipation
Dave..
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 25th Oct 2024 3:41 pm |
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1784
Member Since: 04 Sep 2009
Location: Almunge
Posts: 170
  
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Sounds like the nut on the HP pump itself.
Here are some decent pic's of the setup. https://www.autoexpress.co.uk/land-rover/d...p-pictures
Do you have good rail pressure when cranking? Defender 110 SE 2021, Tasman Blue
Discovery 1 V8 ES 1997, Epsom green
Discovery 3 V8 HSE 2006, Bonatti Grey
Range Rover V8 1983, Sierra Silver
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| 25th Oct 2024 5:15 pm |
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Yorkie064
Member Since: 11 May 2024
Location: Wiltshire
Posts: 9
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1784 Thanks for taking the time to reply re "Do you have good rail pressure when cranking? " what is this rail and where how do I measure it?
Thanks also for the link...appreciate you reply
Cheers
Dave
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| 26th Oct 2024 2:22 pm |
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1784
Member Since: 04 Sep 2009
Location: Almunge
Posts: 170
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The fuel rail that feeds the injectors. That is what the HP fuel pump feeds.
Pressure is normally checked with diagnostic tool.
Lacking such, cracking a fuel line to an injector open while cranking could at least show if there is fuel present.
Be careful, the system has fuel under high pressure.
I'm a bit suspicious about the nut that fell off, sounds very strange to have that happen while driving unless there is some causing factor, such that something abrubtly locks up. I have no idea what this would be though. Defender 110 SE 2021, Tasman Blue
Discovery 1 V8 ES 1997, Epsom green
Discovery 3 V8 HSE 2006, Bonatti Grey
Range Rover V8 1983, Sierra Silver
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| 26th Oct 2024 6:41 pm |
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Yorkie064
Member Since: 11 May 2024
Location: Wiltshire
Posts: 9
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Thanks 1784...no fuel from cracked injector pipe. Use a borescope I was able to see the belts and 2 cogs turning OK with the engine cranking... Even with the nut off the cog was still attached to the shaft and the nut went back on OK with no resistance so I assuming the shaft was still straight and true..guess at this point the HP fuel pump must have failed 
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| 27th Oct 2024 9:24 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10732
 
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Worth checking you can hear the tank pump working when you turn the ignition on.
Should run for 30 seconds.
And maybe unplug the 2 pipes (1 at a time?) at the top of the engine briefly to ensure filters aren’t blocked.
I guess you have done most of that.
These engines do take a long time to prime fuel.
Maybe leave a nut cracked slightly open at injector and crank for up 30 seconds and stop.
Or use a small amount of start spray
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| 27th Oct 2024 10:05 am |
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