SMG Actuator Tear Down

[eacmen]

Decided to disassemble a used spare SMG actuator in the interest of potentially rebuilding it and to learn more about how it works.

Some photos below. But I have two pressing questions.

Does anyone know what tool is needed to remove these rings?






Also is it possible to get the connector for the GPS, remove these pins and insert them into another connector? Anyone have a place to order the connector?





More photos from the teardown here:

https://photos.app.goo.gl/Rgwicgt4PMd5BWPq5

Sent from my iPhone using Tapatalk

[heinzboehmer]

1. Looks like you need a pin wrench or a socket with four protrusions on it, like what's used sometimes for axle nuts. Did a quick search and apparently they're called spanner nut sockets? Could be wrong though. Anyway they look like this:


If you just want to take it apart and don't care about destroying the nut, a cold chisel/flathead screwdriver and a hammer should get it off quickly.


2. Most of the connectors on this car are made by TE connectivity. I've had luck finding some in the past by searching for "TE <numbers on connector>". But yeah it should come apart and let you slide the pins out. Guessing here, but looks like removing that pink bit should give you access the pin retaining tabs.

Edit: Think I found the connector. BMW p/n 61138365927. TE 1-967584-3 looks super close too, but the p/n is different to what's stamped on yours. Maybe an updated (or non BMW specific) p/n? Should be easy to verify that they're the same with the product drawing: https://www.te.com/usa-en/product-1-967584-3.html

[sapote]

Does anyone know what tool is needed to remove these rings?

Spanner nut socket as said, or modify a standard socket with sanding wheel.

[eacmen]

More teardown photos posted to the google drive link. Anyone with experience in hydraulic seals know the type of seal this is?






Sent from my iPhone using Tapatalk

[sapote]

Is the seal in pic broken or it is normal?

[eacmen]

Is the seal in pic broken or it is normal?

its normal. its a metal spring steel ring. The other seal is some form of rubber and has a taper to it.


Sent from my iPhone using Tapatalk

[sapote]

Is that rod moving to shift gears?

[eacmen]

Is that rod moving to shift gears?

Hard to describe. Maybe i’ll shoot a video later. But there there two opposing hydraulic pistons. And two hydraulic lines going to each piston. The way I think it works is when wanting to move the shift lever fore/aft it will pressurize one side and remove pressure from the opposing side.

There is a third hydraulic piston to rotate the selector rod.


Sent from my iPhone using Tapatalk

[sapote]

1. Hard to describe. Maybe i’ll shoot a video later. But there there two opposing hydraulic pistons. And two hydraulic lines going to each piston. The way I think it works is when wanting to move the shift lever fore/aft it will pressurize one side and remove pressure from the opposing side.

2. There is a third hydraulic piston to rotate the selector rod.

1. Sounds like a similarity to VANOS piston operation
2. How does a linear piston rotates the selector rod -- spring loaded on one side?

[eacmen]

1. Sounds like a similarity to VANOS piston operation
2. How does a linear piston rotates the selector rod -- spring loaded on one side?

Correct. Spring loaded on one side.


Sent from my iPhone using Tapatalk