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Two issues were apparent with some early D4Ds, the injector seats failing and allowing combustion gases into the rocker space which overheated the oil and caused clumps of the burnt oil to return to the sump and collect on the oil pump pick up and the second was injector failure, generally pre DLC injectors. The first starves the engine of lubrication and cooling oil and the second means poor fuel atomisation which leads to detonation and holed pistons etc. Neither pretty.
I have kept a pretty good eye on this and I haven't heard of any of the upgraded seals failing. Not to say that hasn't happened just that I haven't seen any comments. There is some evidence to suggest that even some early 150s had the old style seats so I am all for having the injectors pulled at 40,000km or an interval of that when the valve clearances are checked. New seals then should pretty much mean this failure mode has been eliminated. Do this every 40,000km as per the book and I doubt that it would ever be an issue.
There have been documented failures of DLC injectors failing. I would suspect that mlc's engine had DLC injectors and any of the 150s that have had issues (and I know of three or four) have the updated injectors. The only solution is to keep an eye on the feedback values and total volumes when cold. We tend to see more problems with the injectors at this time of year through winter. Just because the air temperatures are lower and it takes longer for things to warm up so the 'detonation' of larger injection droplets is more likely. I will be getting my feedback values done every 40,000km with the seals. Possibly will look at the software option too to check the numbers if I have something to run the software on.
Yes the percentage overall of failures is low, in the days of multiple failures in the 120 pre DLC injectors no one was able to get much headway on having Toyota consider the injectors as an issue. It is just that if it happens to you then it is a major issue. Even with extended warranty the vehicle is tied up for a few days regardless of who ends up footing the bill.
There is a thread on this site about preventative maintenance and I suggest that people be aware of the contents of that and also the warning signs that the D4D is unhappy but and this is a big butt sometimes there is no warning. My 120, Dave's 120 and possibly mlcs and others are testament to that. Injectors are and always have been a consumable, whether their life should be 120,000km or 240,000km is moot, injectors wear out and have to be replaced and you just need to know when. Information is your best ally. EDIT: AND clean fuel!
I have kept a pretty good eye on this and I haven't heard of any of the upgraded seals failing. Not to say that hasn't happened just that I haven't seen any comments. There is some evidence to suggest that even some early 150s had the old style seats so I am all for having the injectors pulled at 40,000km or an interval of that when the valve clearances are checked. New seals then should pretty much mean this failure mode has been eliminated. Do this every 40,000km as per the book and I doubt that it would ever be an issue.
There have been documented failures of DLC injectors failing. I would suspect that mlc's engine had DLC injectors and any of the 150s that have had issues (and I know of three or four) have the updated injectors. The only solution is to keep an eye on the feedback values and total volumes when cold. We tend to see more problems with the injectors at this time of year through winter. Just because the air temperatures are lower and it takes longer for things to warm up so the 'detonation' of larger injection droplets is more likely. I will be getting my feedback values done every 40,000km with the seals. Possibly will look at the software option too to check the numbers if I have something to run the software on.
Yes the percentage overall of failures is low, in the days of multiple failures in the 120 pre DLC injectors no one was able to get much headway on having Toyota consider the injectors as an issue. It is just that if it happens to you then it is a major issue. Even with extended warranty the vehicle is tied up for a few days regardless of who ends up footing the bill.
There is a thread on this site about preventative maintenance and I suggest that people be aware of the contents of that and also the warning signs that the D4D is unhappy but and this is a big butt sometimes there is no warning. My 120, Dave's 120 and possibly mlcs and others are testament to that. Injectors are and always have been a consumable, whether their life should be 120,000km or 240,000km is moot, injectors wear out and have to be replaced and you just need to know when. Information is your best ally. EDIT: AND clean fuel!
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