Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 1st August 2020, 20:10   #1
RoverRyan
Avid contributor
 
Rover 75

Join Date: Oct 2015
Location: Alfreton
Posts: 201
Thanks: 21
Thanked 47 Times in 36 Posts
Default 3 speed Fan Issues

Hi guys,
I had the opportunity to have my Mk1 PPD 75 on T4 today. The guy checked the VIS motors on the 2.5 litre KV6 to find 1 not working but thats fine I have spares.

He also checked the fan operation,
1 dead
2 dead
3 working correctly, fast.
I am unsure about how exactly to fix this problem. After reading, the most common fault is the brushes and it seems these are the favourite replacements https://www.ecp.co.uk/rover75-carbon-brushes.php

I am unsure how to go about fixing this problem and where to buy the replacement parts, or do I go down the mk2 fan with gold resistor route???
I would also like to add that my current fan has written on it in white pen, 2.0 KV6??
is there a difference in fans between 2.0 and 2.5?
Thanks for looking.
__________________
Ryan Walker

My Car...

was the 97,610th 75 to run off the production line, out of 112,381
was the 2,001st 75 1.8 T Connoisseur to be made out of 2,392
was the 10,746th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s
RoverRyan is offline   Reply With Quote
Old 1st August 2020, 20:49   #2
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,515
Thanks: 395
Thanked 823 Times in 652 Posts
Default

Quote:
Originally Posted by RoverRyan View Post
Hi guys,
I had the opportunity to have my Mk1 PPD 75 on T4 today. The guy checked the VIS motors on the 2.5 litre KV6 to find 1 not working but thats fine I have spares.

He also checked the fan operation,
1 dead
2 dead
3 working correctly, fast.
I am unsure about how exactly to fix this problem. After reading, the most common fault is the brushes and it seems these are the favourite replacements https://www.ecp.co.uk/rover75-carbon-brushes.php

I am unsure how to go about fixing this problem and where to buy the replacement parts, or do I go down the mk2 fan with gold resistor route???
I would also like to add that my current fan has written on it in white pen, 2.0 KV6??
is there a difference in fans between 2.0 and 2.5?
Thanks for looking.
Not aware of any difference between the 2.0 and 2.5. I've opened about eight fan motors and brought five of them back to life, the others had commutator damage but you'll only know once you're in there.
Unfortunately most of Arctic's pics fell ransom to Photobucket but here's a video of his:https://www.youtube.com/watch?v=ls1B...ature=youtu.be
Quite a lot of information if you use the search, no need to completely remove the cowling free the small bolts and lift & hinge it to the side. Good luck with the three torx screws holding the motor, these can be difficult.

Regards
vitesse is offline   Reply With Quote
Old 2nd August 2020, 16:50   #3
Yorkshire GOC
I really should get out more.......
 
Yorkshire GOC's Avatar
 
Rover 75 connoisseur se v6 auto

Join Date: May 2014
Location: Hull
Posts: 2,057
Thanks: 1,842
Thanked 623 Times in 469 Posts
Default

I am pretty sure the gold resistor only applies to the two speed fan.
__________________
She came off the Longbridge Line on 20-05-2003

The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
Yorkshire GOC is offline   Reply With Quote
Old 2nd August 2020, 20:40   #4
RoverRyan
Avid contributor
 
Rover 75

Join Date: Oct 2015
Location: Alfreton
Posts: 201
Thanks: 21
Thanked 47 Times in 36 Posts
Default

Quote:
Originally Posted by Yorkshire GOC View Post
I am pretty sure the gold resistor only applies to the two speed fan.
yes I know, that wasn't the question...
I was asking whats wrong with speeds 1 and 2 and can I convert to a 2 speed fan.
RoverRyan is offline   Reply With Quote
Old 2nd August 2020, 20:45   #5
suzublu
This is my second home
 
suzublu's Avatar
 
rover 75 1.8 vvc club se wedgwood blue

Join Date: Aug 2009
Location: Seaton Carew
Posts: 26,880
Thanks: 65
Thanked 7,142 Times in 4,642 Posts
Default

Contact Jules https://www.the75andztclub.co.uk/for...d.php?t=189409
suzublu is offline   Reply With Quote
Old 2nd August 2020, 21:12   #6
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,515
Thanks: 395
Thanked 823 Times in 652 Posts
Default

Quote:
Originally Posted by RoverRyan View Post
yes I know, that wasn't the question...
I was asking whats wrong with speeds 1 and 2 and can I convert to a 2 speed fan.
One of the brushes is almost certainly worn out which is why you've lost speeds 1 & 2.

But as for converting it, anything is possible once you've replaced the brush(es) but I'd keep it as a 3 speed fan. If you wish to replace the 3 speed with a 2 speed fan it's plug & play.

Regards
vitesse is offline   Reply With Quote
Old 3rd August 2020, 06:10   #7
stocktake
Vis Whiz
 
stocktake's Avatar
 
Rover 75 2.5 auto Saloon

Join Date: Jun 2007
Location: LEEDS
Posts: 20,582
Thanks: 2,057
Thanked 3,056 Times in 1,621 Posts
Default

You can rewire a three speed fan ( Petrol or Diesel) to operate as a two speed but to do this the three speed fan must be in good working condition. So you would have to strip down and replace the brushes first and if you use the correct brushes the repair will be long lasting anyway.


https://www.the75andztclub.co.uk/for...d.php?t=209950
__________________
Dave...



Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident
stocktake is offline   Reply With Quote
Old 3rd August 2020, 07:59   #8
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,263
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by RoverRyan View Post
I am unsure how to go about fixing this problem and where to buy the replacement parts ...
Hello Ryan,

All you need to do is to renew the worn down brushes which can be ordered directly from Engineering Carbon Products Ltd. for about £20. These were purpose made for our fan motors and mine are still going strong after 50,000 miles (nearly better than the originals)!

The 2 speed system has its own problems:
  • It's noisy.
  • The 'silver' resistor fails.
  • Even some uprated 'gold' resistors have proved unreliable.
  • It's expensive.

I would advise against using the car until this fault is repaired. Currently your fan won't run until the coolant temperature reaches 112 degrees and even then the "fast" speed will actually be "slow" because of the failed brushes.

Both KV6 engine capacities used the same fan system so there's no significance in the "2.0 KV6" marking other than it sounds as if it was second-hand from such a car.

I agree with the consensus that you should keep what you've got and repair it.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 11:30.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd