VIS motor repaired

supernehru · 23rd October 2007, 21:33

Hello
A VIS story:

My 75 started rattling a lot recently from the front of inlet manifold. I had suspected a VIS problem ever since I bought it in May 2006 but there had only been a slight "tinkle" before.
Lately I've also been getting around 18-20 mpg which is a little worrying even if it's mostly short trips around town.
Because of this I removed and dismantled the front VIS motor and found the following problems:
Both micro switches had soldering faults, one of them had a lead that was completely loose.
One of the switches had also failed internally and was open circuit all the time.
I got a new switch of a similar type, V4 size sealed with button actuation, from a local supplier and then exchanged the broken switch with this. The other switch was resoldered and both switches were superglued to the PCB with a specialist high strength glue I use at work.
This repair appears to have worked since the car is now free from any unusual noise and also seems to run much better then it has ever done in my care. The low rpm torque is much improved. (I can now run up a hill on half throttle that before almost required a kick-down to avoid slowing down). I have not yet checked the fuel consumption but I assume that will also show improvement.
I have a had a problem with juddering and this also seems to have disappeared.
Picture of repaired PCB:

The question I now face is: Should I remove and dismantle the other (rear) VIS motor as well? Is there any reason to suspect a problem with it?

Best regards
Tomas

Kandyman · 23rd October 2007, 21:37

Hi Tomas,

Welcome to the owners club.

You seem to know what your doing with the front Vis so it wouldn't be to hard for you to check/fix the rear one.

GreyGhost · 23rd October 2007, 22:39

Hello Thomas

Excellent first post. If in future you could post bigger pics for us it would be a great help.
Glad to hear you have made this repair. Not a very good design.

supernehru · 24th October 2007, 06:03

There are some pictures on http://picasaweb.google.se/Tomas.Borjeson/RoverVISMotor
I was not sure if they might be too big for the forum.

Also, I have actually posted before on the "old forum" last year. I think I may have had a slightly different alias then.

Tomas

Keith · 24th October 2007, 21:03

Tomas I was going to add your pictures but the link you posted does the job!

I would definitely do the back motor as well, most cars I work on have both vis motors faulty.

you need to test them as well as repairing the switches does not always work

mantianak · 24th October 2007, 21:19

Good job with the photos. I keep meaning to sort out the spare ones I have that are broken.

2 questions though,
Is there a way to test them without taking it for a drive, ideally on the bench?
Can the switches be bought online through some site?

JohnDotCom · 24th October 2007, 22:27

Have a T4 in your Garage.

Simon · 25th October 2007, 17:41

Quote:

Originally Posted by JohnDotCom

Have a T4 in your Garage.

Or get one of Late's little box of tricks he has for exactly this purpose

mantianak · 25th October 2007, 20:27

I was thinking of a less expensive and closer solution for testing them. Is it not just a matter of 12v down the right terminal and correctly grounded?

JohnDotCom · 25th October 2007, 22:52

Quote:

Originally Posted by Simon D

Or get one of Late's little box of tricks he has for exactly this purpose

I forgot that one.
I know Keith is trying to get around to doing one for himself now.
That would be cheapest easiest Solution I think.

23rd October 2007, 21:33	#1
supernehru Newbie Rover 75 Saloon X3 Join Date: May 2007 Location: Göteborg Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts	VIS motor repaired Hello A VIS story: My 75 started rattling a lot recently from the front of inlet manifold. I had suspected a VIS problem ever since I bought it in May 2006 but there had only been a slight "tinkle" before. Lately I've also been getting around 18-20 mpg which is a little worrying even if it's mostly short trips around town. Because of this I removed and dismantled the front VIS motor and found the following problems: Both micro switches had soldering faults, one of them had a lead that was completely loose. One of the switches had also failed internally and was open circuit all the time. I got a new switch of a similar type, V4 size sealed with button actuation, from a local supplier and then exchanged the broken switch with this. The other switch was resoldered and both switches were superglued to the PCB with a specialist high strength glue I use at work. This repair appears to have worked since the car is now free from any unusual noise and also seems to run much better then it has ever done in my care. The low rpm torque is much improved. (I can now run up a hill on half throttle that before almost required a kick-down to avoid slowing down). I have not yet checked the fuel consumption but I assume that will also show improvement. I have a had a problem with juddering and this also seems to have disappeared. Picture of repaired PCB: The question I now face is: Should I remove and dismantle the other (rear) VIS motor as well? Is there any reason to suspect a problem with it? Best regards Tomas Last edited by Keith; 24th October 2007 at 21:01..

24th October 2007, 06:03	#4
supernehru Newbie Rover 75 Saloon X3 Join Date: May 2007 Location: Göteborg Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts	Pictures There are some pictures on http://picasaweb.google.se/Tomas.Borjeson/RoverVISMotor I was not sure if they might be too big for the forum. Also, I have actually posted before on the "old forum" last year. I think I may have had a slightly different alias then. Tomas

24th October 2007, 21:19	#6
mantianak I really should get out more....... ZT 190+ Saloon Join Date: Nov 2006 Location: Poole Posts: 2,413 Thanks: 6 Thanked 22 Times in 21 Posts	Good job with the photos. I keep meaning to sort out the spare ones I have that are broken. 2 questions though, Is there a way to test them without taking it for a drive, ideally on the bench? Can the switches be bought online through some site? __________________ http://i35.photobucket.com/albums/d1..._signature.png

25th October 2007, 20:27	#9
mantianak I really should get out more....... ZT 190+ Saloon Join Date: Nov 2006 Location: Poole Posts: 2,413 Thanks: 6 Thanked 22 Times in 21 Posts	I was thinking of a less expensive and closer solution for testing them. Is it not just a matter of 12v down the right terminal and correctly grounded? __________________ http://i35.photobucket.com/albums/d1..._signature.png

23rd October 2007, 21:37	#2
Kandyman Banned ROVER 75 2.5 V6 Connoisseur SE Limousine 2004 Join Date: Oct 2006 Location: Welling Posts: 10,995 Thanks: 0 Thanked 2 Times in 2 Posts	Hi Tomas, Welcome to the owners club. You seem to know what your doing with the front Vis so it wouldn't be to hard for you to check/fix the rear one.

23rd October 2007, 22:39	#3
GreyGhost Banned 180+ Sport Auto Join Date: Oct 2006 Location: Bedford Middle Level Posts: 17,787 Thanks: 0 Thanked 18 Times in 5 Posts	Hello Thomas Excellent first post. If in future you could post bigger pics for us it would be a great help. Glad to hear you have made this repair. Not a very good design.

24th October 2007, 21:03	#5
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Tomas I was going to add your pictures but the link you posted does the job! I would definitely do the back motor as well, most cars I work on have both vis motors faulty. you need to test them as well as repairing the switches does not always work

24th October 2007, 22:27	#7
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Have a T4 in your Garage.