Nice write-up by raMBow. That was my post questioning the use of the late-603 delivery valve O-rings and copper seals in the 606 and yes, they fit and work great. Go ahead and order all new fuel delivery lines and make sure to change the one from the fuel heater to the pre-filter since it is the one that leaks first. I cut the hose off at the pre-filter fitting on my old one and used it with some clear tubing for my diesel purge setup. Works great!

I've also read that some recommend the old style non-metallic intake gasket but I would stick with the metallic type. Aluminum-aluminum interfaces in the present of heat requires good thermal conduction to avoid fatigue cracks.

Straight diesel fuel will barely make a dent in the gunk coating the intake manifold. I've heard bio-D or specialty cleaners work well. Some professional mentioned that he uses a steam cleaner.

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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)