4 wd activation...

[microbus]

Hi All

I recall reading about the activation of synco 4wd fitted with decoupler but cannot find it?

The one weekend
I was still able to activate 4wd and the next ,when I pulled the "knob",no activation!My choice now is to either take it to a mechanic with limited knowhow,or to knock it with a hammer in the right place/suck on a pipe/blow on a pipe or whatever.

Any advice will be appreciated..

(my bus still in Upington waiting reprograminning on black box instead of fitting aftermarket spitronix unit..)

Hans

[Russel]

It can be a few things that are causing this. It may even be that the decoupler is engaging but the tell tail on the dashboard is not working. This would be were I would start. Jack up one side of your van with both wheels in the air. Start engine and engage 4x4 ( in neutral) Clime out and rotate the back wheel by hand, if it engages the front wheel will rotate. If not check that all the pipes are securely on the decoupler actuator. Then you can check if you have vacume at the actuator. Vacume will be on the blue side of it to engage and the black side to disengage. The vacume is not strong but it build if you put your finger over the end of the pipe. If there is no vacume then the problem will most likely be at the dash. If you do have vacume then it the actuator or the decoupler itself. Most common fault with the actuator is a tare in the red boot. This is were to start. :-)

[microbus]

(06-02-2017 11:04 PM)Russel Wrote:  It can be a few things that are causing this. It may even be that the decoupler is engaging but the tell tail on the dashboard is not working. This would be were I would start. Jack up one side of your van with both wheels in the air. Start engine and engage 4x4 ( in neutral) Clime out and rotate the back wheel by hand, if it engages the front wheel will rotate. If not check that all the pipes are securely on the decoupler actuator. Then you can check if you have vacume at the actuator. Vacume will be on the blue side of it to engage and the black side to disengage. The vacume is not strong but it build if you put your finger over the end of the pipe. If there is no vacume then the problem will most likely be at the dash. If you do have vacume then it the actuator or the decoupler itself. Most common fault with the actuator is a tare in the red boot. This is were to start. :-)

Hi Russel

Fixed it!The connector (that rubbery thing with roaping around it...)of the pipe fitted to the actuator had a tear in from rubbing against bodywork.Cut the tear part off and refitted.

It then interesting enough did not activate,but then I saw at front one fitted to front dif that one of the 2 pipes had pulled out.Pushed it back and Bingo!!!

Thx for help!

(Hope abovementioned makes sense!)

[microbus]

Hi

Some more 4x4 activation challenges!

I have a decoupler,difflock front and back.

My difflock at back engages with light indicating engaged on dashboard.
My decoupler engages but no light indicating this on dashboard.
My front diff does not engage but light flashes even if difflock is activated or not.It only goes off if back diff is activated!!

Any guesses what could cause this?

I assume the front difflock cannot engage if my decoupler is not engaged?

The flashing light makes me nervous as I am aware that a sudden activation of the front diff can give me a very nasty surprise...

Any advice will be appreciated!

Hans

[microbus]

Thanks Stuart for contacting me in connection with this problem and detailing all the potential problems and solutions.

Much appreciated!!

[syncromad]

Pleasure Hans, feel free to contact me if you need more help..