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#1
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Live ACC footage...
http://www.youtube.com/watch?v=Ol5zxgtarB4
This is an old leaking servo that I opened up. I'm manipulating the temp wheel in the car which moves the servo motor. The actual electronic part of the servo isn't that complicated. Just the servo motor and a little pot that provides motor position info to the processor. Someone PLEASE correct me if I'm wrong but isn't a servo motor just a motor that can have the shaft position accurately controlled? I understand that a "Stepper" motor has the position feedback built in. The rest of the inside of the servo isn't that much different from a regular multi function switch with a multi function vacuum switch in there as well... I have another video of some troubleshooting that I've done with the ACC.
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD |
#2
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It's not often you get to see Satan's heart at work.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#3
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http://www.youtube.com/watch?v=UBpNvtWGG4w
This is where I am now. I took the top off my servo and bypassed the vacuum control part. There is a position that you can place it in that keeps all the flaps working properly. It seems like if I let the servo control it it gets screwy which I believe are vacuum leaks where the rubber disc meets the aluminum plate. I need to check the auxilliary pump fuse because it doesn't seem to be working. I still need to check out the problem with it not shutting off It's tied into the AC but I can't seem to figure it out...
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD |
#4
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you have a vacuum leak somewhere, do you have a might vac?
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#5
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check both sections of the defrost pod and the green-yellow vacuum line.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#6
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I have a mighty vac but i'm in the process of separating what circuit does what. I guess I'm going to start with the circuits coming off the main brake booster line. I did find that one of the check valves was a little weak. It wasn't terrible but it didn't seal 100%.
Now, where to find replacement check valves...
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD |
#7
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Quote:
Thanks for the help guys!
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD |
#8
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This thing is about to whip my @ss
All seems well so far but I still have a vacuum leak I can't seem to pinpoint. I took the servo apart most of the way and cleaned/lubed the gears and motor. It sure sounds a lot smoother. It kind of "groaned" before. It's not leaking under pressure and the valve is working well. The thumbwheel actually changes it from heat to cool with no problems! I also removed the blower relay and fixed the contacts inside. Now the trouble... I can start the engine and wait for vacuum to build up, place it on Hi-Cool and it works OK for a couple of minutes. It then slowly changes from center vents to defrost (Like vacuum is bleeding down) then runs for about a minute with the AC blowing out the defrost vents and then there's a click behind the glove box and it stops. I thought it may be the automatic control switching it off but I drove it around a bit and it never came back on. Turning on "defrost" gets it running again and I can switch to "hi-Cool" and it flips to center vents for a few minutes and stops I'm considering calibrating the thumbwheel, plugging the recirc pot (Can I just plug both hoses without screwing anything up? When I unhook the vacuum lines with the ac running it kills the whole thing.) and I'm about to try to hunt down the leak. I also replaced the "sniffer" hose with some pipe insulation. Any advise would be most welcome! I did put the mity vac on all 3 of the branches from the brake booster line. The 2 that go into the car seem to hold pressure well. (One had vacuum on it with the engine running! It was pulling a vacuum FROM the inside of the car which I thought was strange... I also replaced one of the check valves at the main trunk because one seemed a little weak. The only line that didn't hold vacuum was the one that runs to the back of the IP and branches down under the car. I've also found several hard plastic lines that are just open and I can't find out where they go. The ends aren't discolored so it appears they have NEVER been hooked up. Friggin' green wire is weird as well With stuff like that from the factory how are you supposed to troubleshoot it
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD |
#9
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Where did you get those tires????
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Did you just pass my 740 at 200 kmh in a 300SD????? 1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership |
#10
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Quote:
You really must follow the test protocols in the ACC II FSM. You will need to check all of the pins on the test connector to ensure they are all within specification. The in-car temp sensor must be tested, the temp wheel resistance values, etc. The vacuum system is actually quite easy to test, when following the FSM. You apply vacuum to a specific hose and if it doesn't hold vacuum, the FSM tells you what to look for and which part is in that circuit. You really do need to follow that vacuum test procedure....Robert
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Did you just pass my 740 at 200 kmh in a 300SD????? 1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership |
#11
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Quote:
You should have NO open connections.
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Did you just pass my 740 at 200 kmh in a 300SD????? 1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership |
#12
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I have 2 open connections from the servo into the cabin under the dash. They are the small diameter hard tubing. One black,one white. I can't find ANYTHING near by that they could be disconnected from. The ends aren't discolored like some of the other tubes either so It doesn't look like they were EVER hooked to anything. They are just there in the bundle. They mock me... I did check the big "double" pot under the blower and one side didn't hold vacuum. I plugged both hoses and it didn't seem to change anything. The pink pot holds vacuum. I guess I really need a FSM. I've been trying to fumble through it with the diagrams.
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My occupational hazard bein' my occupation's just not around... 1980 300SD 1980 300SD |
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