PeachParts Mercedes-Benz Forum - View Single Post - A journey into the the infamous Om642 oil cooler leak!

markg612 · #**100** 06-11-2017, 10:53 PM

Okay--I'll put up some pictures shortly, but I just knocked it out noon to noon this weekend.

On the ML, some pointers not reveled within,

1) Removed the cowl cover and wiper assemble right off the bat, had I done this first, I'd been done in a day.

2) Pull the firewall shrouding right away too!.

3) This job is undoable without an E10 and E12 socket.

4) The 3 bolts on the exhaust/turbo elbow are a *****. The top 2 have to come out and the bottom is slotted so the elbow lifts off, but access on a R164 install is horribly tight.

5) A plethora of 3/8" and 1/4" extensions are a must for the turbo and exhaust bolts. Note, I've seen a lot of concern about the 2-T45 headed bolts and the base plate bolts being frozen in this thread. If they're corroded, I'd be worried, but they're only torqued to 20nm, and they popped right out, the 6 bolts on the 2 triangular flanges and the 3 on the back of the turbo are torqued at 12nm +90º and need as much ass as you can muster to break loose. An 3/8" E10, a 12" extension, a 3/8" to 1/2" converter and a long breaker bar pop them loose, but not with out substantial force, once they come loose, the spin out.

6) Reassembly--there seems to be a logic to the layup of fuel, return and electrical lines. Low pressure fuel lines, i.e., returns, and supplies seem to have been layed down first, then electrical THEN high pressure fuel. I had only one do over where I needed to dismantle what I'd just installed to properly route components.

7) I was long parts from the list provided here, maybe a half a dozen or so seals I didn't need. I'll look them up and identify them for future reference.

8) Lastly, this is a MF of a complicated job. Organization, preparation and access to the EPC and the WIS REALLY made this go smoother than what I'd expected based on the commentary about this job by other posters herein, sans the original thread author. If you feel confident you could roll your tool box into a MB shop and start working there tomorrow, jump on this, but if not take it to a quality shop.