MGZT radiator fan difference to rover 75 fan M47

janker · 26th March 2021, 18:47

Hi Everybody

My M47 diesel engine, The fan has not worked for many years on slow speed even after changing the bushes , I have got a complete fan assembly from a MGZT V6 would this be interchangeable ??
cheers julian

stocktake · 26th March 2021, 18:57

The motors come in two main forms: ( there is a lesser used variant on some 1.8's) 4 wire three speed and 2 wire two speed with a resistor. these are both fitted to the V6 petrol and the diesel

So, the actual motors are the same. They are not plug and play however as the relay boxes are quite different and also the fan shroud

If you have a four wire three speed fitted and the replacement is going to be a two speed two wire there is a wiring diagram on here somewhere

SD1too · 26th March 2021, 19:04

Quote:

Originally Posted by janker

I have got a complete fan assembly from a MGZT V6 would this be interchangeable ?

Hi Julian,

As Stocktake says, no. The V6 control box will not work with your diesel.

Let's get back to basics. You say that your current fan doesn't work on slow speed. Does it have a resistor?

Simon

janker · 26th March 2021, 19:13

Quote:

Originally Posted by SD1too

Hi Julian,

As Stocktake says, no. The V6 control box will not work with your diesel.

Let's get back to basics. You say that your current fan doesn't work on slow speed. Does it have a resistor?

Simon

Hi Simon no it doesnt have a resistor mate.

janker · 26th March 2021, 19:24

Quote:

Originally Posted by stocktake

The motors come in two main forms: ( there is a lesser used variant on some 1.8's) 4 wire three speed and 2 wire two speed with a resistor. these are both fitted to the V6 petrol and the diesel

So, the actual motors are the same. They are not plug and play however as the relay boxes are quite different and also the fan shroud

If you have a four wire three speed fitted and the replacement is going to be a two speed two wire there is a wiring diagram on here somewhere

Thanks for the info stocktake appreciated.

cbr1100xx · 26th March 2021, 20:01

I've still got the control box off mine(no resistor) if you want to swap it over or try it.
Its untested but the motor in mine was shot and inside the box is nice and clean.
Yours for postage if you want it.

Stan

SD1too · 26th March 2021, 22:23

Quote:

Originally Posted by janker

Hi Simon no it doesnt have a resistor mate.

OK thanks. So it's a 3 speed unit then and you say that you've renewed the brushes without success. Did you buy them from Engineering Carbon Products Ltd. in Croydon? Was the commutator in good condition?

Simon

janker · 26th March 2021, 23:25

Quote:

Originally Posted by SD1too

OK thanks. So it's a 3 speed unit then and you say that you've renewed the brushes without success. Did you buy them from Engineering Carbon Products Ltd. in Croydon? Was the commutator in good condition?

Simon

Hi yes i did and it looked in a fair condition to me.

janker · 26th March 2021, 23:32

Quote:

Originally Posted by cbr1100xx

I've still got the control box off mine(no resistor) if you want to swap it over or try it.
Its untested but the motor in mine was shot and inside the box is nice and clean.
Yours for postage if you want it.

Stan

Hi Stan let me know how much the postage would be at least i could give it a try
cheers julian

Mike Noc · 27th March 2021, 07:33

Yes you can fit a V6 fan to a diesel with a bit of rewiring. As mentioned the control boxes are completely different - the V6 just has relays and the diesel relays along with a circuit board to convert the PWM signal that is used to control it.

You can fit pretty much any fan you want to the diesels - many years ago when my fan failed I fitted a single speed fan from a Rover 25 that was laying around the garage as an emergency spare and it still works fine.

One thing to note, it is not uncommon for the circuit board in the control box to fail on the diesels, so if your fan checks out then the fault could be in the control box. I'm sure Mickyboy on here can supply a good used one.

26th March 2021, 18:47	#1
janker Loves to post Rover 75 Saloon & MGZT 190 Join Date: Jun 2012 Location: Leek Posts: 390 Thanks: 333 Thanked 57 Times in 39 Posts	MGZT radiator fan difference to rover 75 fan M47 Hi Everybody My M47 diesel engine, The fan has not worked for many years on slow speed even after changing the bushes , I have got a complete fan assembly from a MGZT V6 would this be interchangeable ?? cheers julian __________________ This vehicle was the 53,401st 75 to run off the production line, out of 112,381 This vehicle was the 2,551st 75 CDT Club to be made out of 3,403 This vehicle was the 5,192nd 75 in White Gold Metallic (code: GMN) to be made out of 12,251 White Gold Metallic 75s My New Addition MGZT 190 Trophy Blue 2001 Petrol.

26th March 2021, 18:57	#2
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,587 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	The motors come in two main forms: ( there is a lesser used variant on some 1.8's) 4 wire three speed and 2 wire two speed with a resistor. these are both fitted to the V6 petrol and the diesel So, the actual motors are the same. They are not plug and play however as the relay boxes are quite different and also the fan shroud If you have a four wire three speed fitted and the replacement is going to be a two speed two wire there is a wiring diagram on here somewhere __________________ 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; 26th March 2021 at 19:00..

26th March 2021, 20:01	#6
cbr1100xx Gets stuck in VW touareg Join Date: Mar 2015 Location: dunsop bridge Posts: 870 Thanks: 225 Thanked 414 Times in 235 Posts	I've still got the control box off mine(no resistor) if you want to swap it over or try it. Its untested but the motor in mine was shot and inside the box is nice and clean. Yours for postage if you want it. Stan __________________ WE WERE BOTH BORN ON THE 4th of JULY CAR DIED 15/11/2022---I'M STILL GOING (JUST)

27th March 2021, 07:33	#10
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,547 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Yes you can fit a V6 fan to a diesel with a bit of rewiring. As mentioned the control boxes are completely different - the V6 just has relays and the diesel relays along with a circuit board to convert the PWM signal that is used to control it. You can fit pretty much any fan you want to the diesels - many years ago when my fan failed I fitted a single speed fan from a Rover 25 that was laying around the garage as an emergency spare and it still works fine. One thing to note, it is not uncommon for the circuit board in the control box to fail on the diesels, so if your fan checks out then the fault could be in the control box. I'm sure Mickyboy on here can supply a good used one.