What I read here is that all the engines are equipped with the main pressure bypass to pan (oil pressure relief valve, 15), and all engines are equipped with the oil cooler bypass (bypass valve, 16). These are both covered by the closing plugs in the timing cover. The engines with no oil cooler have a closing plug where this green fitting is, sending all the oil through the 1.5 bar oil cooler relief valve into the filter housing . My 4.5 had it and I replaced it with the oil cooler fittings. If there was an internal plug then there would be no flow when the external line was plugged. It is possible there is no #16 bypass valve in the non oil cooler engine I suppose and the oil will just take the path of least resistance. I'll have to pop that closing plug out and look. is there a page "oil circuit without air to oil cooler" in there? I'd like to see that. This is an early engine in the pics I believe or possibly a sedan of some kind. My oil cooler lines on djet r107 engines are both on the block, but this diagram is almost identical to the port locations on the alloy 5.6. thank you very much this is exactly what I was looking for. I've found that the plugs in the alloy block oil galleys are the same thread as some banjo bolts I have(m14 I think, trans cooler lines maybe?), But smaller than the iron block fittings. I'm going to check out the hydraulic line place nearby, BENZ hydraulic ([emoji16]) to see if they can match up a fitting or if not get lines made to run banjo to the original damper and cooler to banjo return. The banjo bolt could be a restriction but it would still flow oil through the cooler and just bypass anything over 1.5 bar to the cold route into the filter.
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