W126 short body OM606

WSchotty

02-02-2020, 05:22 PM #20

Quote:How is the rear axle? Since I last posted, I abandoned my 722.6 plans because I had an axle shaft go bad and got a 2.47 LSD from a 560. With the 722.3 it is not bad. Around town is a bit slower but the highway advantage is great. I picked up about 1-1.5 mpg and have a useable 3rd gear to downshift to at speed.

The 2.47 seems a bit too low for the 722.6, though I have not fully dialed in the controller or IP yet. I may swap in the 2.82 before I dial in all the shifts just based on my first highway run, I still need to play with timing a bit before I decide. I would really like to keep the 2.47 LSD diffs, as the carrier is different for 2.82, though there are aftermarket LSD units by Wavetrac that will fit the W126 1.3L 2.82 carrier for an another $1K. The first LSD axle I have could not hold both wheels anyway, but found another one that seems like the clutches are better. If I don't go 2.82 I'll swap that one in.

Quote:Is the car that you swapped the OM606 into a Gas car ? Im surprised you used the fuel pump, to just get my car on the road Im going with no electric pump.

Did you managed to get your speedo and tach working ?

No this car was a '91 350SD diesel, I used some gas car parts for the fuel system (strainer, fuel lines, pump/tube mount, pump shield, and pump). Tanks of w126 between gas and diesel cars are the same except for a little plastic baffle in the intake tube that you can drill out rivets on to remove for the larger diesel nozzle. I used electric over mechanical for good fuel supply and backup, I had a similar setup on my last cummins swap and it is nice to have redundancy. When my electric pump (or electrical system!) would go out I could still drive (reduced power) on the mechanical. Hopefully this one works the same way. There is a very similar bosch pump used in the ford 7.3L expeditions which I'll go to if these gas ones start dying, but so far with the good o-rings it is running fine. All gauges are working, as well as AC with the EDS system still intact mostly. The only features I removed from EDS were the disengagement of AC compressor when floored and increase of idle when AC pump engaged as that circuit was not happy about all of it's missing EGR sensors/actuators.

Idle after warm:

[Image: 20200121111359.jpg]

Last week I stripped down the parts car the rest of the way and sent it to it's new home:

[Image: 20200122163907.jpg]

A pile of leftovers:

[Image: 20200123125851.jpg]

And got some wax on the body:

[Image: 20200130140803.jpg]

Once it is shined up that bumper gap isn't so bad. I still have to get some wheels and tires on there and put some 2.5/5% on the windows.

Currently I am waiting on a used A-B tester to show up as I want to get the timing perfect. I set it at 8 using the eyeball method, but seems way too advanced. I am smoking around everywhere, I tried dialing the ALDA way back but went too far and it wouldn't start cold, so on the edge of that adjustment and still have enough smoke that I will get tickets here. (Yes, they passed a law here for diesels smoking too much, 100-200$ per ticket) Only thing I can think of is too much advance on the pump, will retard it all the way to other limit of Dieselmeken spec 10 ATDC and see how it goes. Injectors are already set to 150 bar. It is very loud at idle also which supports the advanced timing, maybe my eyeball was a couple degrees off and it is running more like 6-7 ATDC. When retarding pump it should also help earlier lighting of the turbo, so this may improve the low RPM 5th gear highway cruising.

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