Friday, May 23, 2014 at 16:00
There are two modes of major failure.
First is the injectors themselves in the early D4D engines. If they drift out of spec they can grossly overfuel, causing cracked pistons etc. Not all engines are affected, but in those that are the result is pretty much catastrophic. There are replacement injectors available that address the problem.
You can monitor this by asking for injector
feedback values at every service. The limits for the
feedback values are plus or minus 2.5.
Second is the metal sealing washer under the injector. This affects all 120 Series and some 150 Series. The injectors are in the rocker box. In some cases the original washers would leak and allow combustion gases to blow by into the rocker area. This would carbonise some oil, carbon granules would get washed down to the sump where they would be caught in the oil pump pick-up screen. If this remains undetected the screen will block completely and the engine will fail. There are replacement sealing washers that fix the problem.
If you're a DIY person you can monitor this by inspecting the pick-up screen through the sump drain at every oil change.
My injectors were replaced at 60,000 under warranty - dealer picked up the problem, bless him. But I worry about the washers underneath - that problem hadn't reared its head when the injectors were replaced, so they are probably the potentially leaky ones. Oil pick-up is clean though. 170,000km and researching :-)
Cheers
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