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overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:27 pm
by slinky2000
Right, the sport went up to about 3/4 ont he temp guage today in traffic and I've never seen it that high before, It never went above half even when stuck in traffic on a hot day.
Anyway, I can stop the fan with my hand so I presume the coupling thats the cause of the problem. coolant seems to be pumping ok and heaters work fine.
I know its just a big nut but do I take off the rad in order to get access? Is it just a simple swap job?
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:30 pm
by kam-325i
First Qustion........
What engine is it ?
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:33 pm
by slinky2000
sorry m20 2.5
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:37 pm
by kam-325i
Ok.....
Is an easy job.
The rad can stay on. If you have the cowling on the rad, this wil have to come off.
Just unscrew the big nut off the water pump, there is enough room between the rad and fan to pull it out. just remmember its a left hand thread.
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:45 pm
by slinky2000
ok thanks I'll have a look tomorrow to see
when you say "Just unscrew the big nut off the water pump" does the pump need to come off?
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:47 pm
by kam-325i
No. The pump will stay where it is. The end of the pump shaft has the thread on the end.
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:48 pm
by slinky2000
got ya! cheers
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 6:55 pm
by slinky2000
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 7:00 pm
by bmwe30mtech
The way to do it is a hard sharp hit with a hammer (on the spanner). Force is not what is needed, and as said, remember its a reverse threaded nut.
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 7:03 pm
by topspark
kam-325i wrote:Ok.....
Is an easy job.
The rad can stay on. If you have the cowling on the rad, this wil have to come off.
Just unscrew the big nut off the water pump, there is enough room between the rad and fan to pull it out. just remmember its a left hand thread.
As Kam said above its quite easy . 32mm spanner required IIRC.
have fun.
Re: overheating > fan coupling > how to change
Posted: Sat Feb 16, 2008 8:00 pm
by tomtomtom
correct it is a 32mm spanner, i did this job today, piece of p1ss, took 10 minutes, it takes longer to unscrew the 4 bolts that hold the fan to the coupling than to actually take the thing off.
Re: overheating > fan coupling > how to change
Posted: Sat May 03, 2008 3:57 pm
by duke_rattlehead
sorry to ask this question as its probably been asked to death, but how do you stop the water pump shaft from rotating when you try to undo the 32mm nut? I have tried cable tying the fan belt and wedging a spanner on the pulley but neither are strong enough to stop it rotating.
EDIT: with the use of mole grips and a BFH it came off quite nicely
Re: overheating > fan coupling > how to change
Posted: Sat May 03, 2008 6:40 pm
by slinky2000
lol nice one mate, I just got my machenic to do mine while he was doin a few other jobs.
