W126 short body OM606
W126 short body OM606
![[Image: 20200109182043.jpg]](http://u.cubeupload.com/wschotty/20200109182043.jpg)
It seems the o-rings in these gasser pumps don't like the diesel. I pulled some pumps apart and switched out the o-rings for diesel resistant type and it seems fine now. Rings are about 4.7cm od x 3mm:
![[Image: 20200109182107.jpg]](http://u.cubeupload.com/wschotty/20200109182107.jpg)
![[Image: 20200109191811.jpg]](http://u.cubeupload.com/wschotty/20200109191811.jpg)
![[Image: 20200109191908.jpg]](http://u.cubeupload.com/wschotty/20200109191908.jpg)
Here are the locations of the rings inside the pump:
![[Image: 20200115172115.jpg]](http://u.cubeupload.com/wschotty/20200115172115.jpg)
And back together with extra crimping:
![[Image: 20200115172033.jpg]](http://u.cubeupload.com/wschotty/20200115172033.jpg)
Once I got the diesel and oil leaks stopped, I ran the car for awhile and found that the OM606 thermostat was not opening early enough for my comfort. I swapped it out with a OM603 thermostat as the 603 thermostat spring assembly extends a couple CM further into the block than the 606 one, this seems to have resolved that issue. The previous loping appears to have been cured by removing EDS form the pump, so that will stay that way.
I took it around the block a little bit then about a mile on a good paved road to get into some boost, running only about .8bar for testing I can already tell this thing is going to be really fun. Sadly I found the rear brakes were stuck on due to smoke billowing out and the brake fluid escaped, so I will have to swap the good parts over from the 83. It sounds like the guide rods are shot also, luckily those should also swap over from the 83 as I just rebuilt all of that recently.
I am still smiling from the sound of the turbo spooling on this thing, has to be one of my favorite sounds on the planet. I did blow a boost elbow off when I turned it up to 1 bar going back up the hill, so I am going to have to do something about that for running full boost. Worst case I'll have to make stainless pipes with smaller rubber pieces off medium trucks with spring clamps, but that should not be needed for these low boosts under 3 bar, I am hopeful that I was just not tightening the T-clamps enough. I'll try roughing up the edges of the aluminum a little with sandpaper and clamp down harder, hope they hold.
More to come next week, hopefully soon I can get to tuning the transmission and pump.
A small update this week. I replaced the vacuum pump seal with the correct one (A 604 238 00 80) to stop the oil leak, but found that there had been a new diesel leak from the fuel pump. I tried 3 different gas pumps, but they all eventually started leaking in the same place, from the crimp side of the body:
It seems the o-rings in these gasser pumps don't like the diesel. I pulled some pumps apart and switched out the o-rings for diesel resistant type and it seems fine now. Rings are about 4.7cm od x 3mm:
Here are the locations of the rings inside the pump:
And back together with extra crimping:
Once I got the diesel and oil leaks stopped, I ran the car for awhile and found that the OM606 thermostat was not opening early enough for my comfort. I swapped it out with a OM603 thermostat as the 603 thermostat spring assembly extends a couple CM further into the block than the 606 one, this seems to have resolved that issue. The previous loping appears to have been cured by removing EDS form the pump, so that will stay that way.
I took it around the block a little bit then about a mile on a good paved road to get into some boost, running only about .8bar for testing I can already tell this thing is going to be really fun. Sadly I found the rear brakes were stuck on due to smoke billowing out and the brake fluid escaped, so I will have to swap the good parts over from the 83. It sounds like the guide rods are shot also, luckily those should also swap over from the 83 as I just rebuilt all of that recently.
I am still smiling from the sound of the turbo spooling on this thing, has to be one of my favorite sounds on the planet. I did blow a boost elbow off when I turned it up to 1 bar going back up the hill, so I am going to have to do something about that for running full boost. Worst case I'll have to make stainless pipes with smaller rubber pieces off medium trucks with spring clamps, but that should not be needed for these low boosts under 3 bar, I am hopeful that I was just not tightening the T-clamps enough. I'll try roughing up the edges of the aluminum a little with sandpaper and clamp down harder, hope they hold.
More to come next week, hopefully soon I can get to tuning the transmission and pump.
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