PeachParts Mercedes-Benz Forum - View Single Post

Jeremy5848 · #3 07-25-2009, 02:16 AM

Quote:

Originally Posted by pawoSD

The 606 is an awesome engine, better than the 603 in many ways....no head issues, much more power, better economy....etc. An all around more modern and robust engine. The main issues that it seems to have are fuel system/seals/o-rings related. The delivery valves on the Injection Pump leak eventually, and there are a lot of little o-rings in the fuel system that can get brittle and leak air/cause running issues. The motor itself is good. It also has the risk of stuck glow plugs in the head.....that is one of the other biggest issues.

If I could be picky here, the TURBO 606 is more powerful than the 603 but the NA version in the '95 W124 and the '96-97 W210 has less power and feels like it has much less power. You have to let the 606NA engine wind up before you get any power out of it, it lacks the low-end oomph of the 603. I own both, I know.

Otherwise, the 606 has no significant problems, especially no head problems. In both NA and turbo versions it is more economical than the 603. As PawoSD says, there can be o-ring and fuel line problems (I have had some) but these are things you can fix yourself. I have not had any stuck glow plugs (have replaced only two so far) but others have and it can be a problem.

Jeremy