When I had that issue it took 2 diesel purges and a tank full of driving and it seems mostly ok now.
Sent from my iPhone > On Mar 16, 2017, at 7:53 AM, Meade Dillon via Mercedes > <mercedes@okiebenz.com> wrote: > > Status update > > Timing has been corrected, didn't help. > > Turbo boost restored to ~14 psi, and that helped to resolve a lot of > the problem. Smoke is gone, but the nailing persists. > > Correct glow plugs installed, didn't help. > > Injectors with new Monark nozzles installed tonight, and if anything > the problem is worse. :\ > > I may need to find a new mechanic. The fellow who installed the > injectors FAILED to put heat shields under #1 and #2!!! What a > looser! When I found this I thought "Ahh HAH!! This is it!" but alas > I don't see the improvement I was expecting. Perhaps there is > excessive carbon build up in those two pre-chambers, and I've got to > burn that out? > > I can think of three more things to try: > > (1) Rebuild the delivery valves (DVs) again. > > (2) Swap all the DVs with a "known good" used set, from the original pump. > > (3) Replace the injection pump. > > I don't think compression is the issue, the car started just fine at > 28 deg F this a.m., and per normal it idles smoothly for a few seconds > while the glow plugs are hot, and then it starts to miss. > > -Max > > >> On Jan 15, 2017 10:10 AM, "Meade Dillon via Mercedes" >> <mercedes@okiebenz.com> >> wrote: >> >> Dieselvolk, >> >> Here's the situation: My 124.193, with 365k miles, isn't running well >> at >> all. Under anything more than gentle throttle, the engine pings and >> smokes. Mileage is bad, around 22 mpg in town, about 25 on the >> highway. I >> used to get about 26 in town, 28 on the highway. Starts fine, idles >> fine. >> A diesel-purge treatment will clear it right up, and it will run just >> fine >> (and get better mileage) for about a month, and then it declines back >> to >> poor running. Italian tune-ups will also help a bit (especially with >> the >> smoking). >> >> What changed? I installed an injection pump from a 3.5 liter engine. >> One >> of the three hold-down tangs on the original IP broke (long story) so I >> had >> to replace it, and I had this 3.5 liter IP on the shelf. >> >> When I installed this "new" IP, I overhauled the delivery valves, and >> adjusted the ALDA 1/2 turn richer. I have since moved the ALDA screw >> back >> to the original position, I think, I need to check the records. I may >> have >> only moved it back 1/4 turn. >> >> What else is wrong? I have the wrong glow plugs installed. When I >> installed the "new" head a few years ago (with oblique injection) I >> swapped >> in the relatively new glow plugs from the original head. Oblique >> injection >> heads use a glow plug that is shorter. >> >> Last weekend I adjusted the timing (it was a couple degrees advanced), >> and >> then went on a 900 mile highway trip for work. No change in >> performance. >> I think that this bigger pump is over-fueling the engine, resulting in >> lots >> of un-burned fuel and carbon build up. >> >> Options that I can think of: >> >> 1) Back off the ALDA screw a little more. >> 2) Install the correct glow plugs. >> 3) Check the turbo output, bump it back up if low. >> 4) Remove the 3.5 liter injection pump, put a 3.0 liter IP back in >> (Wilton's old 300D engine has one) >> 5) Pull the engine and tranny, swap in engine / tranny from Wilton's >> 300D. >> This is attractive because my engine has a nagging oil leak that I >> haven't >> been able to solve, plus that engine / tranny are much younger, only >> 143k >> miles. The downside is that engine still has the original #14 head, >> but >> that is minor (I think the head is sound). >> >> ------------- >> Max >> Charleston SC > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
