Syncro vacuum diagram for front/rear diff-lock controls?

[zeohsix]

[syncrodoka]

Having trouble understanding your question.
The wiring from the decoupler and lockers are all wired into the white plug that plugs into the simple circuit board behind the locker panel. The brown wire is just ground. Your van is a factory rear locker equipped van?
The picture above shows the plug just above the person's thumb.

[dkonzy]

Awesome thanks! Bulbs already in there...

Having trouble locating the existing brown wires and plug...where does it split off? I want to be able to trace it from somewhere....
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1987 Syncro

[syncrodoka]

Put a bulb into the middle position of the locker panel. The wiring is already there from the decoupler to the locker panel from the factory on locker equipped vans.

[dkonzy]

I just installed a decoupler and found the engage/disengage sensor connector on the decoupler itself...where do I plug the other end into on my dash so that the middle green indicator light will work and I finally can say i've got 2/3rds of the green lights I want on my dash?
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1987 Syncro

[CaptTurbo]

I'm pleased to run across this thread. I've recently revived my '87 Syncro after a number of years because of vexing grounding issues caused her to be parked. My rear locker is not working and I suppose it isn't too surprising since they should be actuated once in a while to keep their function.

[AIR_COOLED_EXPRESS]

[syncrodoka]

That connector is for the flashing unit for the front lockers. If you don't have front lockers and the flashing unit it is a non-issue.

[AIR_COOLED_EXPRESS]

[tencentlife]

Dave, even if a restrictor were inline, it would't reduce the peak head of vacuum available in the system at rest, which when applied will quickly equalise to the same head once the air is displaced due to servo movement. More simply, it's all under the same negative head most of the time, and that is equal to peak manifold vacuum.

It only takes ~1 lb. of pressure to work a locker rod, but the servos can exert ~30 lb. of direct pressure.

I also tapped into the brake booster line and use the booster as the reservoir. Doesn't alter brake efficacy nor locker operation.
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[davevickery]

I now have my locker installed (on my 2wd van) and I tapped into the brake booster line upfront under the removable panel. My question is, did the stock setup tap into the same line, and was there a pressure reducer somewhere in the system? I can't find anything in the Bentley. Mine works fine, but it seems like there is a lot of vacuum on that line and I am wondering if that is the same amount of vacuum the stock system would normally see. I am not using the cannister, just tapping straight into the brake booster under the dash. It hisses when I switch on/off and locks/unlocks very quickly compared to my previous syncro which always worked well. I just want to make sure I am not putting too much pressure to the system as it is constantly under vacuum and judging by my previous stock syncro it doesn't seem to need much vacuum to activate the locker .

If anyone knows I would appreciate a reply or if it is covered in the Bentley and you know where, I can look it up. Thanks very much,
Dave

[syncrodoka]

Exploded view

The vertical fork on the right is attached to the other side of the pin that will not allow it to twist.

[syncrodoka]

[IdahoDoug]

Excellent! Enough to grab onto. Soaking in PB a few hours now. Any thoughts on twisting? I see the shaft from the actuator is offcenter, so that should be a limiter to only a few degrees before I risk that, but wondering about the other end in the tranny. Parts diag seems to indicate it would be OK. Now thinking of twist to loosen, no longer to get roll pin out as I handled it with something highly technical. I ........ um ........pushed the shifter into another gear and it was totally out of the way. cough.....

DougM
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1987 2WD Wolfsburg Vanagon Weekender "Mango", two fully locked 80 Series LandCruisers. 2017 Subaru Outback boxer. 1990 Audi 90 Quattro 20V with rear locking differential, 1990 burgundy parts Vanagon. 1984 Porsche 944, 1993 Toyota LandCruiser, 2002 BMW 325iX, 1982 Toyota Sunrader

[syncrodoka]

The full stroke of the actuator is 20mm.

[IdahoDoug]

Syncrodoka,

Nice shot. The T is 9 1/2" forward of the major frame crossmember on the right side outboard of the longitudinal frame on the brake vacuum line.

So, I've tapped the roll pin partly out of the locker actuator rod. I have two spare. Before knocking that pin out and committing, I want to try to grab the actuator rod and see if it will loosen up first. Can anyone tell me approximately how far the actuator rod moves? That will help me not bugger up the part of the rod that goes in and out if my cloth slips. Thanks.

DougM
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1987 2WD Wolfsburg Vanagon Weekender "Mango", two fully locked 80 Series LandCruisers. 2017 Subaru Outback boxer. 1990 Audi 90 Quattro 20V with rear locking differential, 1990 burgundy parts Vanagon. 1984 Porsche 944, 1993 Toyota LandCruiser, 2002 BMW 325iX, 1982 Toyota Sunrader

[syncrodoka]

GWTWTLW mine isn't stock but you get the idea.

[IdahoDoug]

Heh - I got your endless loop!! I'll be under the van in about 20 minutes and will describe that spot Frankensuby's mentioned. Do you have a vacuum reservoir under there now?
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1987 2WD Wolfsburg Vanagon Weekender "Mango", two fully locked 80 Series LandCruisers. 2017 Subaru Outback boxer. 1990 Audi 90 Quattro 20V with rear locking differential, 1990 burgundy parts Vanagon. 1984 Porsche 944, 1993 Toyota LandCruiser, 2002 BMW 325iX, 1982 Toyota Sunrader

[FrankenSubySyncro]

[GWTWTLW]