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Thread: Hitachi digger white smoke?

  1. #1

    Hitachi digger white smoke?

    As above Hitachi 490 (Izuzu engine) digger starts in morning lumpy and a lot of white smoke for about 5-10 minutes. Runs fine then but in around the 2 hr mark it cuts out at full throttle, like diesel starvation symptoms. I have to grind it over for about 20 seconds before it starts again and it goes like a pig rest of the day as if its being starved of fuel. It will probably cut out about three times in the day. New fuel filters when this started and new fuel lines as well after problem arose. anybody have any ideas how to pinpoint the problem? I was thinking a cold start device is causing smoke in the morning but I started it two or three different days just to move it and no white smoke but if I work it all day, the next morning its starts with tons of white smoke and lumpy as if its slightly off a cylinder or cylinders.

  2. #2
    Meant to add as well last night that white smoke is definitely over fuelling. consumption gauge shows digger running between 200 and 300 percent fuel when white smoke is present at tick over rather than the 20-30 percent at tick over normally. Misspell last night as well as its a 470 not a 490 mot that that makes any difference I'm sure

  3. #3
    Ganger Wazza's Avatar
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    Quote Originally Posted by Big Kev View Post
    Meant to add as well last night that white smoke is definitely over fuelling. consumption gauge shows digger running between 200 and 300 percent fuel when white smoke is present at tick over rather than the 20-30 percent at tick over normally. Misspell last night as well as its a 470 not a 490 mot that that makes any difference I'm sure
    Sounds like a injector pump issue ,havent had water through it recently have you ?

  4. #4
    Quote Originally Posted by Wazza View Post
    Sounds like a injector pump issue ,havent had water through it recently have you ?
    Possibly could have been Wazza, fitter was out to it and changed filters after it first displayed fuel starvation problems, after cut outs and white smoke he came back and replaced any rubber fuel lines that were hard and brittle and blanked off EGR. still doing same thing, he said theres a charcoal type sealed primary filter on the machine which he personally doesn't like. He was to come back and change it to a bowl type but haven't seen him since.

  5. #5
    just to add I did run the drain at bottom of the tank but it seemed water free, I will try the primary filter again on Monday as mechanic disabled it in case it leaked the tank contents out, theres a small butterfly valve above drain turn handle i think he has turned off but I need a screw driver to turn it which I didn't have with me

  6. #6
    Anybody know where the diagnostic plug is on this machine or what protocol it uses?

  7. #7
    Admin Muz's Avatar
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    Are you sure youve found all the filters ? . Wouldnt be the first time Ive found one in the lift pump that others have missed. NEXT check all banjo connectors as flakes of paint from fuel barrels get stuck in them and will shut off flow. Any fitter worth their salt will prove fuel belting out of the feed to the pump ..anything less isnt good enough .. even then you can have floating obstructions in the tank .. the list goes on.. but you need to start from the tank and work back .. dont waste money on expensive fixes like pumps when the solution is 'usually' a simple one
    Please don't PM me for plant advice.. thanks .. Post in the forum where I will gladly help, as will many of our contributors.. as the info and responses will help everyone else, which is why we exist

  8. #8
    Ganger Wazza's Avatar
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    Yep do what Muz suggests ,and also give the diesel tank a good dose of a quality injector pump lube , if its a sticking rack in the injector pump it might help.
    Or not .

  9. #9
    Found all the filters Muzza, four in total on machine with three changed barring the charcoal primary filter which I suspect might be the culprit, When I get time I will check the primary as I think fitter disabled drain as nothing coming out when I turn the drain handle( fitter wants to change it next time he's back to a bowl type) and banjo bolts, must be at least 6 or 8 of them I can see from top side, To be fair to company fitter has a lot on his plate and we are 1 hour from his base at head office so he's reluctant to travel too often. I never got a chance to run machine before he arrived last two times as it takes 2 hrs work before issue shows up. I wasn't with him the two times he was with the machine so I cant confirm if he checked for a good flow to high pressure pump. Engine is common rail
    Last edited by Big Kev; 11-10-2020 at 09:13 PM.

  10. #10
    Ganger Wazza's Avatar
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    Quote Originally Posted by Big Kev View Post
    Engine is common rail
    Oooh one of those fandangled things , Does it have a suction control valve "SCV" ,if faulty those things can cause fueling problems

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