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240D Central Locking vexation
Since my car is out of commission while I await the funds to procure a new Diff and start a rear end re-build I figured I'd tackle the central locking system which the previous owner told me had been disconnected because they "didn't want to mess with it"...
Can anyone tell me how the three way valve in the drivers door is supposed to function? I cannot get it to pull any vacuum with the mityvac attached to the first connection with the rod in either position. With the vac on the last connection there is a medium speed leak with the rod all the way closed and it holds no vacuum with the rod open. I'm guessing this is faulty but I'd like confirmation before I shell out the money for a replacement. Also. Does anybody know how the fuel door module and the trunk lock module are supposed to work? - Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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Vacuum is supplied to the central port of the master switch (by the yellow line).
To test the switch: Sit in the driver's seat and close the door. Plug the first (aft or left) unlocking port (yellow and green line), and the plug third (fore or right) locking port (yellow and red line). Apply vacuum to the central port with the door unlocked. Then, apply vacuum to the central port with the door locked. If it holds vacuum in both positions (locked and unlocked) the master switch is okay.
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78 W116 300SD 'Desert Rose' new as of 01/26/2014 79 W116 300SD 'Stormcloud' RIP 04/11/2022 Last edited by Alec300SD; 05-19-2019 at 02:27 AM. Reason: typo |
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Are you sure the yellow green and yellow red lines are meant to be attached in the positions you describe? Because on mine they were attached the opposite way round. I mapped out the entire system so I could see if I could identify how the PO had messed with stuff.
- Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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Pretty sure its is that way...that is how it is setup on my W116s.
With driver's door locked (shaft of actuator rod in master switch is retracted) and vacuum applied to center port, then vacuum is mantained when the third port is plugged. The central locking system can act strangely depending on the areas that are leaking. Attached is a link to FSM job 80-260 Checking central interlock. https://www.startekinfo.com/StarTek/outside/12265/program/Chassis/80-260.pdf I'm going though this very process of sorting out the central locking system with 'Stormcloud' at present. Keep at it and you'll get it working properly.
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78 W116 300SD 'Desert Rose' new as of 01/26/2014 79 W116 300SD 'Stormcloud' RIP 04/11/2022 |
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Quote:
- Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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What is the symptoms of your problem before YOU started messing with it? Does it lock and unlock like it should when you apply vac to it as the switch would?
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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I have a nice color coded diagram of the entire cars vacuum system now so I'm trying find out if the lines are actually connected to the devices in the correct manner. When I say the drivers door operates on it's own. I mean that it locks and unlocks with the key, but the rest of the doors remain locked at all times. The fuel flap does not lock at all and the trunk lid is permanently locked. Requiring the key to unlock it at the latch. - Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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The driver door is the only one that does not operate in vacuum. So, if there is zero vacacuum you can still get in the car at the driver door. Nothing would have to be done to arrive at that condition. Driver door working and everything else not working would be a natural fail condition.
Basically, one pipe to the three way is constant vacuum from the pump or tank The switch in one position “sucks” to unblock Switch in the other position sucks to lock If there’s no vacuum coming to the switch then it’s somethig between the switch and under the hood You should be able to lock and unlock with a hand pump depending on what side you suck. I think your on the color codes already. Y/G unlock Y/R lock If it is not operation and or not holding vacuum on either then there is a leak.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
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Quote:
Quote:
Quote:
- Peter.
__________________
2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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The center port on the driver door valve is the source. Attach your mityvac there.
Disconnect the two outer hoses at the joints below the valves. Plug up both these joints with golf tees. Set the drivers door to the locked mode (lock knob pushed down) and pump up the mityvac. Pull out the golf tees one at a time from the outer lines. If nothing happens the line you just uncapped is the unlocking line. If the line whooshes and the vacuum is lost that is your locking line (red-yellow goes here). Now plug both lines up again, switch to unlock mode, pump it up again, now the other line should release the vacuum and the other should hold. The one that releases the vacuum is the unlocking line (green-yellow goes here). Also try just pumping it up and leaving both tees in place, then switch modes back and forth and leave it for a couple minutes in each mode. The switch should maintain vacuum. If you can’t hold vacuum in the switch, or the behavior of the ports is not consistent, the vacuum switch is bad. You should also be able to pull vacuum on the red-yellow line and lock all the other doors. then pull vacuum on the green-yellow line and everything should unlock. The early models (including 123/1st gen 126) use a two-pod system, the red-yellow line pulls all the pods to lock and the green-yellow line pulls to unlock. Note the fuel door has a single lock pod, there is a spring to pull it back to unlock after vacuum is removed from the lock line. Once a pod pair (except for the fuel door) is pulled to one position or the other, it is stable in that position even if vacuum is lost on that side. It requires releasing the vacuum on the one side and applying it to the other to get it to change modes. Contrast with the 124/later 126/210 system where these use a single pod and an electronic pump that either sucks (unlock) or pressurizes (lock).
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#12
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Quote:
- Peter.
__________________
2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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The only other places in the system that could be causing problems that I can figure would be either the fuel flap or the trunk lock mechanisms. I think the fuel flap mechanism may be incorrect. I might try bypassing that altogether and see if I have any luck. - Peter.
__________________
2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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Yep those rubber joints go bad after 40 years and leak. The hoses can also crack inside the door boots where it flexes.
If you follow the WIS instructions in post 4 it will take you through step by step. They show a proprietary MB vacuum tool but a mityvac will work just fine for this. Note if you are trying to follow that link on a mobile device it will try to take you to m.startek.info instead of the original site. Depending on which browser you use there is an option to force it to load as a desktop site, then it will work. You can still order vacuum line from the dealer in color code but it is $$$ Pelican sells generic translucent tubing. Just use a sharpie to color code at each end.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech Last edited by jay_bob; 05-19-2019 at 09:34 PM. |
#15
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Sampson Autoparts South Central L.A.
5.22
So ; Where are you at now ? .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
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