TD 5 Diagnosis please

[turbine]

Greetings gentlemen. New to the forum. I have a problem with a Defender, 1999, TD5.
It has received regular services prior to its purchase by me two weeks ago. However has been standing for over one year. 96,000 miles.
Work done so far. Big Ends checked with no damage/scoring. Slight scoring of cam followers. As though driven hard immediately after cold start.Turbo replaced due to excessive play at the impeller shaft. (Oil blowing through the phosphor bronze bearing.) New fuel manifold and plug. Screen from maniflod to injector inlet cleaned. New injector loom. Intercooler cleaned out. Oil pump sprocket bolt changed. New fuel filter.
Symptoms.  
1.Sometimes difficult to start, when it does it's very lumpy for a few seconds. (Fuel system throughly bled)
2. Slightly rough at idle, but smooths out when revs are increased.
3. White smoke
No discernable noise indicationg any mechanical malfunction.
This engine has not been brought to operating temperature yet. Am still doing work on the coachwork and don't want to idle it for a long period. Will bring it up to temp under driving conditions.
I am totally unfamiliar with this engine and would appreciate your imput please. It is a beautifully built engine.

[Xtremeteam]

id say that it was the head gasket personally,but id need to have a bit more of a think about it

[turbine]

Thanks for the reply Mike. I had a slight suspicion of the same but would hope it's not. Just a thought, when I drained the oil it struck me as being too thin and there was a distinct diesel smell to it. Unfortunately I cannot get any records as to why this vehicle was decomissioned. It was just parked and left to be replaced by another. Cheers man.

[Xtremeteam]

Thanks for the reply Mike. I had a slight suspicion of the same but would hope it's not. Just a thought, when I drained the oil it struck me as being too thin and there was a distinct diesel smell to it. Unfortunately I cannot get any records as to why this vehicle was decomissioned. It was just parked and left to be replaced by another. Cheers man.

hmmm

i know what that is :lol:

Injector seals,if they go it lets diesel into the oil basically,

[thermidorthelobster]

Couldn't be oil in the ECU loom, could it?  My Disco has started to misfire when cold (with smoke) and I'm pretty sure that's what it's down to.

[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]

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.

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.