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Thread: John Deere 30 series Injector fault

  1. #1
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    John Deere 30 series Injector fault

    First time I have ever posted on here have a 6630 in for a set of injectors fit 6 new injectors Denso common rail ran 5 mins then went of on no 1 cylinder I stoped tractor and wouldnít start again as new Injector was stuck open even with electrics to injectors unplugged it was constantly injecting fuel into no1 removed Injector and got another one re-fit and rebuilt this time it ran for 4 hours in the workshop and it has done exactly the same again. Same cylinder Removed Injector sent away to get stripped and examined there is no Debry or particles found in the Injector all they said is it was stuck but canít really see why......... never posted on here before but this job is getting to me and canít keep throwing injectors at it !!

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    Senior Member T P's Avatar
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    Re: John Deere 30 series Injector fault

    Sounds a nightmare, the only thing I can think of is to consider if there is anything to do with either the recess the injector sits into or the tightening of the retainer(s) that could be warping the injector body ever so slightly. Could there be dirt under a copper washer or something along those lines. I suppose a nightmare scenario would be a defect in the head itself like a small crack or a pocket in the casting that has collapsed. I am not familiar with that particular model just thinking that anything that would bend an injector ever so slightly when installed and settled might be enough to make it stick open.

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    Re: John Deere 30 series Injector fault

    Quote Originally Posted by petek87 View Post
    First time I have ever posted on here have a 6630 in for a set of injectors fit 6 new injectors Denso common rail ran 5 mins then went of on no 1 cylinder I stoped tractor and wouldnít start again as new Injector was stuck open even with electrics to injectors unplugged it was constantly injecting fuel into no1 removed Injector and got another one re-fit and rebuilt this time it ran for 4 hours in the workshop and it has done exactly the same again. Same cylinder Removed Injector sent away to get stripped and examined there is no Debry or particles found in the Injector all they said is it was stuck but canít really see why......... never posted on here before but this job is getting to me and canít keep throwing injectors at it !!
    Why were you fitting injectors? had one of the ones coming out also packed up in a similar way?




    Quote Originally Posted by T P View Post
    Sounds a nightmare, the only thing I can think of is to consider if there is anything to do with either the recess the injector sits into or the tightening of the retainer(s) that could be warping the injector body ever so slightly. Could there be dirt under a copper washer or something along those lines. I suppose a nightmare scenario would be a defect in the head itself like a small crack or a pocket in the casting that has collapsed. I am not familiar with that particular model just thinking that anything that would bend an injector ever so slightly when installed and settled might be enough to make it stick open.

    +1 on your line of thought. Sounds the likeliest scenario? Its assumed that the injectors go in their respective holes easily without needing any force to get fully home?

    Final shot in the dark- this isn't one of those JD prone to head gaskets?
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    Re: John Deere 30 series Injector fault

    Was changing injectors because of high leak back and running badly

    Will have a look but they all went in easy enough and the seat were the copper washer sits looks clean enough.

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    Re: John Deere 30 series Injector fault

    Have you checked the electrical connections on the side of the rocker cover and on the Ecu above the engine? Are there any error codes coming up on the command centre?

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    Re: John Deere 30 series Injector fault

    Hi no fault codes itís mechanically sticking and itís sticking open so constant fuel been sent to cylinde.

  7. #7
    Senior Member T P's Avatar
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    Re: John Deere 30 series Injector fault

    This is more than a bit of a long shot but can you easily check if both inlet and exhaust valves are opening and closing properly ? I once fixed a six cylinder engine that had been slowly filling the sump with diesel for a year. The owner had replaced the head gasket himself and mislocated a tappet rod. An inlet valve wasn't operating but you could not tell that easily as it was sucking open a little with the vacuum. He'd changed the lift pump and heater plugs twice as well as having the injector pump sealed twice. Relocated the rod and it never looked behind it! It's very unlikely to be valves but I wondered if the exhaust valve wasn't working right could the engine build enough pressure in the cylinder to mess with the injector closing? Just something unlikely to eliminate, if you can't get at the valves easily running a compression test comparison with a couple of other cylinders would probably suffice instead.

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    Senior Member T P's Avatar
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    Re: John Deere 30 series Injector fault

    Actually on further consideration a compression test would not be adequate as there would be no fuel in the cylinder to mimic a running scenario, consider this theoretical instance. While running at some point the cylinder fires but the exhaust valve doesn't open even for one revolution, the next time the piston comes up there'd be almighty pressure in the cylinder acting on the needle in the injector, possibly enough to lift it off the seat and bend it? Does your engine have hydraulic tappets as they've been known to give trouble where they are fitted to for example Case NH engines? It's not easy to see an intermittent fault in a conventional mechanical valve train drive but nothing's impossible. Definitely worth checking the valves are behaving the same as other adjacent trouble free cylinders.some Electric injectors use a pressure balancing principle of construction so could probably be lifted easier by cylinder pressure than the old style mechanical ones. Once the needle got lifted and bent the extra fuel running into the cylinder would soon raise the pressure to very high levels if it had nowhere to get out. Plenty of revs and theoretically you could put a leg out of bed with a faulty exhaust valve drive train. All a bit unlikely but worth considering.

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    Re: John Deere 30 series Injector fault

    Hi thatís a good point but if would surely be causing issues earlier then 4 hours. The fuel specialists have said its likely to be a fault with the fuel and the customer has had problems with fuel on his farm we have changed the fuel and itís been running 5 hrs now.....

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    Re: John Deere 30 series Injector fault

    Quote Originally Posted by petek87 View Post
    Hi thatís a good point but if would surely be causing issues earlier then 4 hours. The fuel specialists have said its likely to be a fault with the fuel and the customer has had problems with fuel on his farm we have changed the fuel and itís been running 5 hrs now.....
    That's plausible but then why did it not affect the other cylinders? We've used the same small family business fuel supplier for about fifty years and never quibble over a penny or two, funny enough we've never had a catastrophic fuel component failure in the fifty years either and one of our tractors if fifty years old, seen too many expensive problems elsewhere when racing to the lowest common denominator. Both my van and jeep never run on anything other than BP ultimate ,wouldn't contemplate putting supermarket fuel in either. I've made plenty of money fixing other people's cheap fuel issues to run my own vehicles on rubbish. One chap had a massive secondhand tank that he never filled and the bottom was a mush of rust condensation and other nasties. By the time he wrecked the pump on everything about the place and spent a fortune on changing filters every time the supplier "stirred the soup" eventually the penny dropped and a new tank was procured. The came a point when the injector pump on his JD6520 failed for the third time__ I just laughed at him.

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