Vehicle & Technical > Defender

2.5 TD running rough after re-build

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Graham2:
Head off at lunchtime (the engine's not mine) and no cracked pistons, which was nice. Head seems fine, so it looks like it was all that extra fuel sloshing about trying to burn. The tops of number 2 and 3 pistons were very black, which was expected as the 2 and 3 exhaust ports were black and sludgy. So, hopefully it'll all be ok when I get the head back on with a new gasket. I can't wait to get it done, to see if it runs like it should.

trickydicky:
what do you mean all the extra fuel sloshing about were was it cumming from? by the way i changed the lift pump which was easy to do but what a difference. not at first but after about 40 miles or so it now has more power seems to be using less fuel and a lot less smoke on startup because the engine now starts easier.not brilliant but a lot better. it will be good to hear what you have found since we last spoke.

Graham2:
When the turbo boost diaphragm on the fuel distribution pump was perforated, it allowed fuel to be sucked up the pipe and into the turbo. The diesel then got forced into the alloy inlet manifold, where it sat in the bottom of the horizontal tube. It was being sucked up into the cylinder head when the inlet valves opened, mixing with the fuel squirted in by the injectors. There was obviously far to much fuel to burn, and the excess came out as thick white smoke. There was about 1/4" of fuel in the inlet manifold (which should be dry!) so if I re-build the top end, everything should be sweet as a nut. Well, that's the theory anyway. Only time will tell I suppose, but here's hoping! I'll let you know how I get on.

trickydicky:
sounds good but i think i would bust mine if i tryed that

Graham2:
Well, the head went back on on Monday, followed by the injectors etc. Then on went manifolds and turbo. With all the other bits sorted today, it started! Bit of white smoke, but that's to be expected, what with all that unburnt fuel sludge to burn off in the exhaust. I should be able to get it out of the garage for the first time in weeks tomorrow, and give it a bit of a run round the field. I'm REALLY hoping that this has sorted it once and for all. I'll re-do the tappets and fuel pump timing first, just to make sure everything's as it should be, but it could be near the end of this long running saga... I just want to drive it!

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