Are you sure the diaphragm is leaking? I had what appeared to be that problem. It may be that the diaphragm is stuck open. I set my air compressor at 10 psi and injected some ether into the waste gate hose and pulsed it with the air compressor. After a few cycles, I could hear the diaphragm cycling. I used ether because there is only a small drain hole on the front side of the diaphragm and I didn't want to load it up with a penetrant that might not drain out. At least a good wet shot of ether will
disolvee crud and then evaporate.
On Sun, Sep 9, 2018 at 7:43 PM vwnate1@yahoo.com [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:
O-kay then ;Before taking the waste gate apart to adjust your boost, you need to test it along with your ALDA as you cannot properly adjust the boost level unless the wastegate's actuator holds pressure and therefore, vacuum making it an easy thing to test before you've disabled the car .Now I know why my wastegate hose was disconnected when I bought this car ~ quite a bit of boost pressure was being lost through the bad diaphragm ~ it leaks like the proverbial sieve .To - day I removed the overboost protection valve on the firewall and it's two supposed to be translucent hard plastic hoses and the banjo bolt in the intake manifold . the banjo bolt was still clean from the last time I had it out a few years ago but the plastic hoses were full of gummy crud and looked black inside .I used some purple cleaner stuff diluted 50/50 with water, sprayed it in the open end of the hose and allowed to soak whilst I went off in search of my flexible stainless steel Mechanic's wire, used that to try and clean out the accumulated crud, that didn't work well until I made a 1/2" loop back in one end of the wire then ran it back and forth, back and forth stopping to rinse the hose out & re spray in cleaner occasionally, pretty soon I had mostly clear plastic with some solid black sections, spray in more purple power cleaner and run that wire back and forth, turning it in the hose so the looped end would scrape loose the remaining black crud ~ I was able to see the loop exactly where it was gently (round loop avoids scratches/damage) touching the inside of the plastic pipe .Amazingly, I did this in the kitchen sink (SWMBO went to Magic Mountain for Great Grandson's birthday) and guess what ? NO black stains in the old worn out 1923 white porcelain sink ~ I LOVE this stuff as it leaves zero residue as long as you don't let it dry .Anyway, because the wastegate diaphragm leaks I plugged the boost hose at the turbo and re assembled everything, adding a dashboard boost pressure gauge using the special 1985 model year ALDA banjo bolt that has a nipple on the end that almost matches the hard black plastic pipes used in Mercedes as vent hose.....Yes, when I bought the various vacuum valves off the junked '84 300D in No. Las Vegas I asked for and received the black plastic pipes and installed them so now there boost gauge will have *instant* response instead of the usual slower response when using a rubber hose to the gauge .Then I re - installed my old leaky ALDA , buttoned everything up and took a test drive ~ I now have boost at *much* lower RPM's and the car takes off from a halt smartly .I didn't see any smoke in my mirror but I pulled over and used a 10MM ring spanner and very small flat blade screwdriver to turn the ALDA's adjustment screw another 1/4 turn clockwise to lean out the idle / off idle mixture a little bit (remember : I hate smoke) .The car still has plenty of get up and GO ! however I'm concerned about the amount of total boost as when I'm hard on the throttle and the engine is turning 3,500 RPM's the gauge actually reached 20 pounds of boost and I don't want to blow this engine .? Does anyone know what the maximum boost should be ? .? At what pressure (in pounds, please !) does the pressure switch in the intake manifold operate to close the overboost protection valve ? .I realize I still have more repairs to do but for now I can modulate the throttle inputs,it boosts right up to 15# getting up to speed and cruises between 7 ~ 11 # .Any and all thoughts will be appreciated .-NateRob wrote :Nate,
I look forward to hearing what you find with your turbo.
The adjustment bolt is the bolt in the center of the diaphragm in the wastegate. Follow the directions in the article I sent 1st.
Rob
=
Al Boucher
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Posted by: Alan Boucher <alsthe1@gmail.com>
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