is there a how to on changing VIS motors - Page 2

Avulon · 15th October 2018, 07:24

Thanks for the speedy answer. I guess in reality it could be either way, open or closed) depending on how the VIS is left after bench test as well. One other thing I assumed also was that during reassembly the cam position on the gear didn't matter because once it was powered once it would be in one of the correct positions yes?

stocktake · 15th October 2018, 07:38

On the balance vis the cam needs to be positioned between the two switches. If you look on the back of the vis motor just where the drive cog fits through you will see a raised arc that travels through 90 degrees. If you look closer on the drive shaft recess you will see a small indented arrow head. this should always be within the arc

A quick visual check of a balance vis is when you remove it: A working one will always have the flap fully open and the arrow will be to the left of the arc when looked at

Final tip, if you use 12v to test a balance vis that is not connected to the flap it is possible ( but not always) that it just continues to go round and round and not in a smooth action, makes you think something is broken but fact is the flap acts to stop the inertia from the motor allowing it to overrun

Arctic · 15th October 2018, 09:29

Quote:

Originally Posted by stocktake

Quote:

On the balance vis the cam needs to be positioned between the two switches. If you look on the back of the vis motor just where the drive cog fits through you will see a raised arc that travels through 90 degrees. If you look closer on the drive shaft recess you will see a small indented arrow head. this should always be within the arc

A quick visual check of a balance vis is when you remove it: A working one will always have the flap fully open and the arrow will be to the left of the arc when looked at

Final tip, if you use 12v to test a balance vis that is not connected to the flap it is possible ( but not always) that it just continues to go round and round and not in a smooth action, makes you think something is broken but fact is the flap acts to stop the inertia from the motor allowing it to overrun

Hi Dave.
Are the photo's any good a visual explanation to your written one above hope so

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Avulon · 15th October 2018, 09:41

Quote:

Originally Posted by stocktake

On the balance vis the cam needs to be positioned between the two switches. If you look on the back of the vis motor just where the drive cog fits through you will see a raised arc that travels through 90 degrees. If you look closer on the drive shaft recess you will see a small indented arrow head. this should always be within the arc

Doggone it! I'll have to get this checked again before being refitted and I've already sent the back with me Dad. Better know now than later though.

15th October 2018, 07:24	#11
Avulon This is my second home 1.8t Tourer Join Date: Oct 2011 Location: Tanelorn Posts: 4,830 Thanks: 956 Thanked 1,148 Times in 916 Posts	Thanks for the speedy answer. I guess in reality it could be either way, open or closed) depending on how the VIS is left after bench test as well. One other thing I assumed also was that during reassembly the cam position on the gear didn't matter because once it was powered once it would be in one of the correct positions yes? __________________ Need a T4 ?: T4 Owners Map thanks to Stevestrat ( use at your own risk) Where?: https://en.wikipedia.org/wiki/Tanelorn Mods/Retrofits: PCV vortex 'filter'; bluetooth; inline thermostat; reversing sensors; plenum spyhole ; headlamp washers ; Diy mp3 player replacing CD multichanger; FBH with remote; Headlamp washers; black/chrome front grille, rear blind; Xenon projectors To do: puddle lights; 2 Din cd/nav to fit; boot release button

15th October 2018, 07:38	#12
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,590 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	On the balance vis the cam needs to be positioned between the two switches. If you look on the back of the vis motor just where the drive cog fits through you will see a raised arc that travels through 90 degrees. If you look closer on the drive shaft recess you will see a small indented arrow head. this should always be within the arc A quick visual check of a balance vis is when you remove it: A working one will always have the flap fully open and the arrow will be to the left of the arc when looked at Final tip, if you use 12v to test a balance vis that is not connected to the flap it is possible ( but not always) that it just continues to go round and round and not in a smooth action, makes you think something is broken but fact is the flap acts to stop the inertia from the motor allowing it to overrun __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident Last edited by stocktake; 15th October 2018 at 07:56..