[diesel_mercedes] Poor Fuel Economy '82 240D Slushbox

 



When the overhaul was done the cam chain tensioners were so badly worn I wanted to take photos to share, I never got any of the amazingly worn out parts back in spite of asking repeatedly .

Anyway, I'm wondering if the injection pump (means ignition) timing is late a little bit, I can't imagine bumping it to 29 degrees but at least the specified 24 and maybe 26 .

You're right, a 2.4 Liter Diesel engine coupled to a slushbox tranny isn't going to break any speed records but it should get better fuel economy than this no matter what .

I may have to look into the EGR valve, it could be stuck partially open and causing this .

We'll see, I'm not done fooling with it yet, I have to keep jumping around between the three W123's and old Motos, my '59 VW Beetle, on and on....

Stay tuned .

-Nate
       Mark  wrote :

Maybe late cam timing would show up as lack of power; maybe not.  And what does lack of power look like in a 240D?


You had and drove this car extensively before the rebuild, so, you know how it was then.  I'll give you that.  And if it's not now any lower on power than it was before, then, cam timing may not be an issue.  Still, it wouldn't hurt to check it.


I'd bet that most of the engines owned by this group have late cam timing, caused by timing chain stretch.  And owner's just accept the performance of their cars as: "Oh, it's an old diesel.  That's how they are."


At 335,000 miles, I bumped up the timing on my '79 SD by 5 degrees, and really woke up the engine.  It ran well before; no smoke, adequate power, started in below zero degree Fahrenheit.  Fuel mileage was decent (23-24 mpg), but I realized another 2 -3 mpg after the advancement.  I'm going to check the timing on the TD engine before it goes into the Jeep (hopefully in the next two weeks....)


Mark in Centennial, CO

 


 


 

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