Vehicle & Technical > Defender

TD 5 Diagnosis please

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turbine:
O.K. Mike go through my thinking with me please. The fuel pressure at the manifold stays at a high constant pressure, hence the cooler at the return side back to the fuel tank. If the seals are leaking there is too much fuel going to the cylinders which would account for the uneven idle. At higher r.p.m. more fuel is required so the leak would have less of an effect. However white smoke at the exhaust shows us that unburnt fuel is passing through the exhaust manifold. Would we not also get a case of slight pre-ignition at higher r.p.m. though? Or if a leak it would be too small to create pre-ignition, yet over time still accumulate in the oil sump.
This would also make sense as regards the turbo bearing and cam follower wear. The crank turns at half the speed of the cam hence less wear compared to the cam. The much thinner oil would not be able to dissapate the high heat at the turbo bearing.
Can the seals be replaced or is it a case of renewing the injectors as a unit. Is there a prevalence of these seals going in the TD5?

Thermidorlobster. I can see how the backfiriing would be caused by the loom. Improper contacts mean that the injectors aren't opening at the correct time, or doing so intermittently. I replaced the loom to narrow down my faultfinding process. I have a new spare loom however, if you want it give me your postal details and I will send it tp you.

thermidorthelobster:

--- Quote from: "turbine" ---Thermidorlobster. I can see how the backfiriing would be caused by the loom. Improper contacts mean that the injectors aren't opening at the correct time, or doing so intermittently. I replaced the loom to narrow down my faultfinding process. I have a new spare loom however, if you want it give me your postal details and I will send it tp you.
--- End quote ---

Sorry, I misread "backfiring" as "misfiring"!  That's a very generous offer;  however, I'm guessing the loom in the Defender is different than the Disco, as the ECU is further away...?  I'll probably have the work done by my usual garage, in which case they might want to use their own parts, so I think it's better if it goes to somebody else.  But I do appreciate the thought!

turbine:
Some feedback Mike. The head is cracked at the fuel rail section. Hence the leaking diesel. At least now we know.

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