505 GRD weird behaviour Lucas CAV Roto-Diesel
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  1. #1
    Tadpole
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    Jan 2011
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    Default 505 GRD weird behaviour Lucas CAV Roto-Diesel

    Having run faultlessly for 3 months it has now a fault where the engine will suddenly cut out & jerk about like kangeroo petrol (in a petrol vehicle). It's very erratic, sometimes it's OK sometimes it won't go over a very jerky 25mph.
    As this is a recent purchase I fitted a new fuel filter & bled system. Result was perfect for a week then the same fault returned. I convinced myself that this was a fuel starvation problem, so I replaced the hoses either side of the filter with clear hoses so I could see if any air was getting into the system. I also pulled out the tank suction filter(-it was perfectly clean). I have bled sytem again(it is a Lucas CAV Rotodiesel) up to the injection pump but I can't get any fuel out of the injector feed pipes. Could this indicate a faulty shut off solenoid/stop valve or an faulty 12 volt feed to the valve?
    I have connected an independent 12 volt supply to the stop valve & (a) it still won't start & (b) the stop valve makes a rather feeble "click" sound.

    Any ideas please?
    bumperman

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  2. #2
    Demannu-facturing! Demannu's Avatar
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    The easiest way to rule out the stop-start solenoid is to remove it, remove the plunger from it and reinstall it. Your engine will run no matter what then, though to stop it you will have to either pull the stop lever on top of the pump or stall the engine.

    Did you put clear hoses on the return line from the pump to the tank as well? Sometimes if the seals are dead on the pump, it can pull in air at that point, however, when running out of fuel or with air on the system, it isn't usually a violent chugging in a diesel, it's more just a gentle loss of power until it stops.

    My guess would be on the solenoid or it's power feed. I notice you've had electrical issues before, so I certainly wouldn't rule out either.
    Scotty

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  3. #3
    Tadpole
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    Default

    Thanks Demannu.

    The easiest way to rule out the stop-start solenoid is to remove it, remove the plunger from it and reinstall it. Your engine will run no matter what then, though to stop it you will have to either pull the stop lever on top of the pump or stall the engine.

    How easy is it to remove(24mm box spanner?) access looks a bit tight!

    I will look at fitting clear hoses on the return line from the pump to the tank.

    Thanks again
    bumperman
    93 Peugeot 405 STDT ser 2 Estate manual Alhambra Red
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    87 Peugeot 505 GTi Estate manual Winchester Grey
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  4. #4
    Demannu-facturing! Demannu's Avatar
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    With a deep socket, they're very easy to remove. They're never very tight, and should only be re-tightened to 'firm', as they have an O ring seal and you're threading brass into aluminium.

    Just don't drop the little bits in the depths of the engine bay as you life the solenoid out!
    Scotty

    Melbourne - Dandenong Ranges

    1956 Peugeot 403 - 'Francois' - resto project

    1969 Peugeot 504 - 'Pascal' - daily driver project

    1970 Peugeot 404 Utility - 'Brutus' - resto project

    1978 Peugeot 604 - as yet unnamed - V6 on straight LPG

    1987 Peugeot 505 - as yet unnamed - project car

    1999 Peugeot 406 Coupé - 'Chloe' - 5 speed manual

    2011 Peugeot 3008 XTE HDi - 'Zoe' - hatchback on steroids

    2014 Peugeot RCZ - 'Remy'

    1999 Range Rover 4.6 HSE - 'Grover' - tow car

  5. #5
    Tadpole
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    Thanks again Demannu.
    I removed the stop-start solenoid & replaced with a brand new unit, when removing the solenoid it came out with its "O" ring & plunger intact-presumably there are no other parts associated with this item? I also checked voltage & got 13v at solenoid. Unfortunately no change!I still can't get any fuel out of the injector feed pipes. As yet I have not put clear hose on the return line from the pump to the tank, but like everything on the diesel side of this vehicle they look original & in good nick. I wonder if I have got a bad injection pump?

    Thanks again
    bumperman
    93 Peugeot 405 STDT ser 2 Estate manual Alhambra Red
    91 Peugeot 505 GRD Estate manual Gold
    89 Peugeot 505 GTi Estate manual Winchester Grey
    87 Peugeot 505 GTi Estate manual Winchester Grey
    96 Xantia td SX Estate RP6910 manual Quartz(silver)

    Wiltshire, UK

  6. #6
    Fellow Frogger!
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    I have had diesels run badly if the leak off pipes are split. By these I mean the small bore rubber pipes that daisy chain between the injectors and back to the pump. I had one that was fine around town but would cut out from fuel starvation at 70mph. Worth changing them all for a few $$s and five minutes.

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