a question for ihi excavator owners

Discussion in 'Heavy Equipment & Pavement' started by grassmanvt, Nov 8, 2006.

  1. grassmanvt

    grassmanvt LawnSite Senior Member
    Messages: 906

    I've got a 97' ihi 28h excavator. It starts a little hard, seems a little worse when cold, I changed one fuel filter(all I could find), took glow pugs out, all look similar and glowed when hooked to power. Checked for power at wire to glow plug band. So, my question, how long does your glow plug light stay on? I was told it might be a bad timer/relay? Mine seems to stay on for about 5 seconds. It is a three cylinder isuzu engine and runs absolutely 100% after started, no hesitation or skip once it starts. Thanks.
  2. ksss

    ksss LawnSite Fanatic
    Messages: 7,170

    I assume you mean a J series. I don't think there has ever been an H. I had a 35J, 1997 model. I assume it had the same three cylinder Izuzu diesel. I never had any starting problems so I will guess. There was only one fuel filter on my 35J. The problem may be in the relay but if it was hard starting in warm weather, that does not sound like a glow plug problem. It maybe an air leak in the fuel system. That engine I believe is self priming, but if it has to build its prime up every morning than that would explain the hard starting. You may want to call Mike at Compact Excavator Sales in E-town, Ky. They are first rate people and offer first rate service. They have everything needed on hand to get you going. You may want to try them for answers if you can't find the problem.
  3. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    I'm not sure if that engine has a diaphragm style boost pump, but its possible that it may be torn, and its not self priming itself very well.
  4. gammon landscaping

    gammon landscaping LawnSite Senior Member
    Messages: 553

    before i started taking off complicated stuff like a fuel system i think i would check my batterys. if one is going bad it just might not be spinning it fast enough. remember keep it simple stupid (kiss)
  5. grassmanvt

    grassmanvt LawnSite Senior Member
    Messages: 906

    Yep, covered that already, new bigger battery, and took the starter off and had it checked out but your right, simple stuff first. Thanks.
  6. grassmanvt

    grassmanvt LawnSite Senior Member
    Messages: 906

    Your right 28j model, damn keys too close together. It does start a little slower than it should in average weather but seems worse in colder weather. Do you remember how long your glow light stayed on??? Just trying to rule that out. I think I might even replace the glow plugs and relay just to be sure but hate to throw money away if that stuff is ok.
  7. ksss

    ksss LawnSite Fanatic
    Messages: 7,170

    I was trying to remember. 5 sec. seems alittle short but it has been awhile. You might want to call IHI and ask. I am reasonably sure that it should stay on longer when it is colder. If it stays on the same amount of time regardless of how cold it is than the relay probably is the problem. When it was real cold I remember cycling the plugs several times before starting it. You may try that and see it helps. I did that by switching the key back from on to off to on again when the plug light when out. You could try and just replace the relay. If that does not cure the problem the fuel system may be the culprit. I would think that if the glow plugs warmed up when you tested them that they would be fine. I still have my parts and owners manual from my 35J it had a trouble shooting section in it. I will try and find that manual. I have it stored away somewhere.
  8. RockSet N' Grade

    RockSet N' Grade LawnSite Silver Member
    Messages: 2,454

    Finish checking the electrical system to rule that out completely. Check your ground to frame to make sure it is fully secured, check battery cables. Rule out simple electrical stuff and then move to next possibility.
  9. janb

    janb LawnSite Senior Member
    Messages: 254

    5 sec is pretty short to generate any heat, I'd check with service to verify correct time, put test lamp on plug to verify time at plug, (rather than @ ind light). Then I would probably wire in a push button switch that bypasses relay, and hold in for desired time (I'm gonna guess closer to 20 - 30 sec @ VT temps), but... if it is tough to start warm, there is a fuel problem, (or worse a compression issue) i.e. starter speed / mechanical problem

    I'd hate for you to spend time and $$ on GP's & relay if not necessary.
  10. grassmanvt

    grassmanvt LawnSite Senior Member
    Messages: 906

    Ok, just tried it today, its much warmer than its been, about 60degrees, but I hadn't started the machine since yesterday, the glow pug stayed on its usual 5seconds but the machine started within 3-5 seconds. It takes much longer when 30 or 40 degrees so, I'm starting to lean towrads the realy, infact, I think I'm going to order one. Thanks for the other leads as well (might still be something else) But I have checked what I could for grounds, they all seem intact and tight. I checked the battery cables earlier when changing the batterey, they seem tight and ground from it is tight to frame. I had also earlier checked to see how long power was sent to glow plugs with a meter and it does cut power to plugs when indicator light goes out. What still makes me wonder though is that I checked to see how long the glow plug in my kubota tractor stayed on today and it only lit up for 2 or 3 seconds and it starts immediatly. I guess different engines and different injection systems will ary though.Heres one more fact though, when I tested the glow plugs directly with a battery and jumper cables, it took at least 5 seconds before the tip even startedto glow. With the timer going out that early and power going through a relay and band first, maybe it just isn't long enough with that much resistance to make any heat at all???

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