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      07-06-2012, 08:16 PM   #1
JamesM3M5
Some dude
 
Drives: E28 M5, E92 335i
Join Date: Sep 2011
Location: Northern VA

Posts: 1,751
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I did it! Adjusted front WGA without pulling turbo!

Holy crap this is a chore!

The rear wastegate rod was a breeze compared to this:

First I removed the intercooler and water pump and thermostat. I needed a coolant flush and the IC was full of bugs and sand. The WGA rod is buried bewteen the turbo and the block, and there is no way to get a wrench or crowsfoot in there to loosen the jam nut or turn the rod.

So I unbolted the WGA from the compressor housing. There are 2xM8 bolts with 12mm heads that hold a bracket. Once that's loose, you can maneuver the WGA rod into a position to get a 10mm open end wrench on the jam nut to loosen it up. Before going any further, I put my handy Mityvac vacuum pump with gauge onto the hose and checked the WG position at 200mbar vacuum (approx 5.9inHg). Manually pulling the WGA away from the compressor housing, I could see the WGA rod was too long by about 4-5 mm! No wonder my WGs rattled like a bitch!!

So how do you turn the WGA rod? It's pretty stiff in the WGA even after loosening the jam nut. I removed the 3xM6 10mm nuts that hold the WGA to the bracket (the one that has 2xM8 bolts that hold it to the compressor). Then I took the vacuum hose off and spun the whole WGA dashpot around about 5 turns. I put all the 3 nuts and 2 bolts back together and popped the vacuum hose back on. Rechecked with the Mityvac, and I can get the WG to be completely shut (rod doesn't move, has no play and a tiny bit of preload on it) at 200mbar vacuum. Whew!

Got it together late last night then beat on it to make sure I didn't do something stupid. Good news: NO RATTLE. I'm so happy Took me every bit of 5 hours start to finish.
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RRT Racing
E92 335i/6MT Dinan Stage 3: intercooler, oil cooler, intake, flash, exhaust, LW dual-mass flywheel.
Vishnu PWM methanol custom trunk mount, Diffsonline 3-clutch Salisbury custom diff, Ohlins Road and Track coilovers, Vorshlag camber plates, much more...
E28 M5 w/ buncha stuff, R171 SLK350

Last edited by JamesM3M5; 07-07-2012 at 07:30 PM.
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