I'm guessing that he changed the delivery valve O-rings as a leak on most of the O-rings on the fuel delivery side make air leak in - not fuel leaking out. It is possible it could have been the shut-off valve O-ring, but that would/should have taken less than 30 minutes to replace.

I think most of us '606'ers on this board have done the delivery valve seals when the ULSD switchover happened. It does require a very clean working environment since one little speck of dirt can lodge in an injector and ruin your nice spray pattern.

I am kind of worried that you mention that he is "not a diesel specialist" but set the timing on your IP. Your IP has an electronic timing adjustment to control the initial advancement - just a quick computer configuration setting and that's it. I'd ask to see his 'timing adjustment' method.

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Scott C.

2006 E320 CDI (120k miles)
FOR SALE: 1998 E300 Turbo Diesel - Black w/Tan Leather - Euro delivery (236k miles)