|
Some observations:
- not all OM617s want to idle smoothly at the same speed, regardless of what the factory spec may have been when they were new.
- finding the ideal idle setting is often a dance between adjustment of the idle adjustment screw and the rack damper bolt.
- on some cars, the process can take a LOT of time to get just right.
- I was taught by a guy with 40 years Mercedes diesel experience that the idle and rack damper bolt should be adjusted when the motor is at operating temperature, preferably right after at least 20 minutes of highway driving (in other words, with the IP thoroughly heat soaked).
- just to check: there should be a flange or 'ledge' around the base of the idle adjustment screw, that acts as a stop for the vertical linkage in its upwards travel. This has been known to break off, and the result can be behaviour as you describe (or worse).
__________________
Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d
“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
|