You retarded the injection timing from where you were used to having it, and 
you're not too happy with the results?
How about doing what an old Saab mechanic I knew insisted on doing with 
ignition timing and set it where it runs best? (which is often a bit more 
advanced than factory, on a 30 year old car it shouldn't matter much to trade a 
little cylinder pressure and NOx output for a bit more power and mpg)

Mitch.

> On January 7, 2017 at 10:33 AM Meade Dillon via Mercedes 
> <[email protected]> wrote:
> 
> 
> That's what I had always thought, but after setting the pump timing cold,
> I'm not too happy with the results, so I was wondering if it should be done
> on a hot engine.
> 
> Careful reading of the FSM for OM60x indicates that it is checked when the
> engine is at idle, and then adjusted if necessary, so now I'm beginning to
> wonder if I should set when hot.
> 
> Wouldn't the timing chain tension change when hot?  If the timing chain
> tension changes, then the pump timing could change?
> 
> -------------
> Max
> Charleston SC
> 
> On Sat, Jan 7, 2017 at 10:19 AM, Peter Frederick via Mercedes <
> [email protected]> wrote:
> 
> > On a Benz, it does not matter.  On my old Volvo with a "cold start"
> > device, either hot or with the cold start disconnected (it advanced the
> > timing quite a bit cold).
> >
> > Peter
> >
> >
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