Snagger Posted May 6, 2020 Share Posted May 6, 2020 Hi all. I have periodically mentioned in various relevant threads that my 200Tdi has been burning a considerable amount of oil ever since it was installed. It was rebuilt from scratch with a rebore, new pistons, head rebuild, followed by a second head rebuild and two turbo rebuilds (the second by Turbo Technics because the first was a rip off by someone else). For all that, the oil consumption and blue smoke on the overrun and at idle has remained. I was also a bit displeased with the oil pressure, which sits at around 15 psi at idle and 50 at high rpm once the oil is at full temperature. The spec figures are 25 and 55 respectively, which is what my 12j gave with the same gauges and temperature sender. The latest Binky video may have given a clue. It seems the banjo bolt on the turbo oil feed line meters the oil flow, so too big a bore would cause problems. My question is could an incorrect banjo bolt allow enough oil flow to give those low pressure readings, and could it swamp the bearings enough to cause oil to leak through the turbine seals directly into the turbine and belt burnt off in the exhaust as visible smoke at idle? It would seem to make sense, as when the engine is working harder and the exhaust pressure is higher, there isn’t visible smoke and perhaps the seal isn’t leaking. I have a bit of oil contamination through the breather system into the air filter (set up like an earlier 12J, breather into filter intake), but the induction system between air filter and manifold remains clean and dry, so there is no oil loss at all through the turbo’s compressor seal. Also related, do the banjo bolts to the piston jets in the block have valves or restrictions? I reused the originals during the rebuild, but wonder if they may be contributing to the lacking pressure. Quote Link to comment Share on other sites More sharing options...
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