I was able to improve shaking when idle by running diesel purge through the 
injectors. Perhaps 2 cans. 

Dan Elliott 

Sent from my iPhone

> On Oct 12, 2016, at 1:35 PM, "arche...@embarqmail.com" 
> <arche...@embarqmail.com> wrote:
> 
> Thanks. I'll try adjusting it.
> Gerry
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Dan Penoff wrote:
>> I don't think so, but I haven't looked at mine to see.
> 
>> The OM617 has a rack damper screw that is visible at the top rear of the 
>> pump as a bolt with a lock nut on it.
>> 
>> The bolt has a spring on the end that presses against the fuel rack in the 
>> pump to dampen oscillations in the rack at idle. When the accelerator is 
>> pressed, the rack moves away from the bolt and is no longer affected by the 
>> spring.
>> 
>> The springs tend to weaken over time, so if unstable idle occurs, you can 
>> adjust the bolt in to see if it affects the idle and smooths it out. If not, 
>> replace the bolt if you're sure everything else such as injectors are in 
>> order.
>> 
>> Dan
>> 
>>> On Oct 12, 2016, at 12:14 PM, archer75--- via Mercedes 
>>> <mercedes@okiebenz.com> wrote:
>>> 
>>> My OM617 hits on all cylinders but shakes on idle. I seem to remember it 
>>> can be fixed by adjusting some sort of bolt and locknut on the back of the 
>>> IP. Does the OM603 have such a bolt? 
>>> Gerry
>>> 
>>>> I don't believe the OM603 has a rack damper, if it does, it's not 
>>>> problematic like the OM617 one was AFAIK.
>>>> 
>>>> Dan
>>>> 
>>>> Sent from my iPad
>>>> 
>>>>> On Oct 12, 2016, at 9:39 AM, Scott Ritchey via Mercedes 
>>>>> <mercedes@okiebenz.com> wrote:
>>>>> 
>>>>> Is this a turbo? Could the shaking be the IP rack damper?
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>>> 
>>> 
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