View Full Version : Radiator fan 308
I was driving along happely todat when i noticed that the water temperature of my 308 was fairly high (oil to).
Now it was hot today about 30 C, when driving outside of town the temperature was about 70 C.
Buth in city traffic it came up to just below 100 C.
When i came home i checked the fans and i saw that the right hand fan didn't run.
Checked the fuses, they where oke.
Chanced around the relays, they where oke too.
Checked the current almost 12 volts, so oke
I took of the front bumper and grill to get at the motor.
Mesured the current at the motor, also allmost 12 volts yet the motor didn't run.
So i have taken out the motor and took it apart to find that one carbon brush whas nearly gone and the other whas totally gone.
Tomorrow i will get spare parts, repair this motor and do the other as well.
I'll also make some pictures of how to do this and post them.
JW
Interesting .
We look forward to have your photos of your repair work. In case the same thing happens to me ...
Best regards
Oke so i started by taking off the bumper an grill.
Unbolt the fan, there is one bolt on the bottom.
Now unless you have removed you radiator, in wich case you can pull the motor back, you have to spead the iron braces that hold the motor in place.
These braces have no hinges so you really have to pull them apart.
Picture 1 shows the left hand motor in place and the braces of the right spread.
Once you have the motor on the workbence it is easy to pull apart.
Take of the fanblades and undo the two bolts that keep the body together.
Picture 2 shows the motor pulled apart.
This afternoon i got replacement carbonbrushes.
They are 6 x 6 mm which is perfect, they are just about a centimeter to long.
Picture 3 shows the plate that holds the brushes with a little part of a brush on the right, on the left it is all gone.
Above you see the new ones.
I took the shorter original springs and put them on the brushes.
Put the brush in the house that keeps it and pushed it in as far as posible.
Marked the end of the house.
Next i cut the brushes with a cutting disc on my dremel.
Picture 4 showes the front of the motor casing,the rotor and the plate that holds the carbonbrushes put together.
I also put the little bal back in the end of the rotor and secured it with some grease (you could put it back later
Picture 5 showes a piece of water pipe i cut and put on the rotor to prevent it from pulling out when i put the two halves of the motor casing back together.
You know, the pull of the magnet in one half pulls the rotor with force.
Then the carbonbrushes are off the rotor again.
Picture 6 shows the casing back together.
On the left the washers that keep the rotor and a dustcap for the bearing.
On the right the screw that adjusts the play of the rotor an its locknut.
(so if you hear these motors ratteling you can ajust the play and the noise stops, watch out!! there has to stay a little play for the rotor to turn)
In picture 7 I put back the motor and altough the picture showes it as a still, it runs beautiful.
8 showes the car in the garage after a testdrive, perfect
As for the left motor, it performes perfectly so i decided not to take it apart.
The brushes are in my garage so if i need them it takes me about 1 hour to do the job.
The right motor is the one that runs the most since it is connected to the AC
nofear02
16-07-2007, 20:51
MY GOODNESS JW!: My respect for you! You just grab a few tools and you just start, seeing along the way, what you see, a little bolt there, and some nut overhere, you just use your brains and you solved it all by yourself: i think that is marvellous! I wouldn't have the patience for it because for me it's no fun: I hate technical work. Probably because I am so dumm as an inkfish as technical matters are concerned.
But it must give you a real satisfied feeling to have fixed it yourself! And saves fussle with a garagist and money too. I know you like doing this, for you it is like leisure/free-time. I think that's cool. I have much respect for someone who can work on a car.
And many thanks for uploading this story and the pics
Kingpin328
16-07-2007, 22:02
And many thanks for uploading this story and the pics!
+1
Well this repair didn't work as planned.
The thing i did wrong was that the carbonbrushes i used didn't have wires fixed to them like the original ones.
I didn't think it would be a problem cause a lot of carbonbrushes use the spring to get the current transfered.
The result was that the spring collapsed, the current going through it caused a lot of heat so the metal got soft
Now i did get this fixed, drilled a hole in the carbonbrushes and glued a wire in place.
Put in a new spring and the fan worked great.
In the first picture you can see the spring.
In the second picture the wires from the terminal to the carbonbrushes.
btw this is the now also worn out left hand fa
I didn't want to put the original fans back.
I looked for aftermarked one.
After some time i found some Spal fans 336 mm.
In order to get these in i first took out the condensor of the AC.
I suppose you don't have to, but since i have taken out the AC compressor some time ago, so i had no use for it anyway.
I removed the spare wheel well and unscrewed the bolts of the radiator.
I was now able to pull up the radiator an puch it back without taking the coolinglines of.
Picture one showes the condensor in place.
Picture two the spare wheel well
Picture three the top halve of the wheel well taken out
Picture four the radiator with the condensor out (there where a lot of dead bugs between the condensor and the radiator
These 336 mm fans were the biggest i could fit, 310 fan would have been easyer to put in.
These fans use 12,7 amps the 310 use 9,3 amps
These fans push 2080 m2 of air per hour the 310mm push 1630 m2.
I'm not sure about the originals buth they push a lot less for sure.
pict 1 the new fans
pict 2 compares new with old
pict 3 top and bottem supports all welded up.
pict 4 my welding is getting better all the time (showes the welded head of a sunken allen head (hex) bolt
The supportbrackets were boulted in the mountingholes of the AC condensor so i didn't have to drill any holes.
pict 1 I painted the supports with a spraycan gloss black Hamerite.
After four layers it looks like it is powdercoated.
I put a piece of rubber insulation on it to prevent ratteling.
Pict 2 and 3 all in place
When all was ready i had to make a test run.
Warmed up the car driving around town, then took it on some small backroads.
After a while the temperature crept up and up till the water was about 100 C and the oil to.
Since i was near home i put the car back in the shop.
It was as if the thermostatic swith in the radiator was not working.
When i checked it all was clear to me, i forgot to put the plugs back on.
Thank god it didn't overheat.
So time for testdrive two.
Now the fans started just under 90 C, you could almost see the temperature dail go down.
Which ever way i drove i was no able to get the temperature a lot over about 90 C.
The oil is also staying nice and cool.
All these years i've owned this car it has allways spilled some coolingliquid after a stiff drive.
Now, nothing, not even a drop
Very interesting to read JWA! Like that you can fix some parts of your car by just DO and HOPE that it will work :) Not straight to the garage with your car, but first have a look at it yourself.
Not an option for a lot of other Ferrari owners here, but when you have some experience, knowledge and skills for this... Must be a great feeling that you can repair such things yourself. That it works even better than it ever did (after a little trial and error :D)!
The only thing that looked strange to me was the photo with the old and the new fan next to each other. That your new fan can move a lot more air for cooling is clear for me, but the old one looks more MASSIVE to me. Isn't that new one a little bit more fragile? And has it enough power? The old one has a big engine and the new one doesn't. AND the old one seems to be made of stronger materials (steel blades?), than the new one (synthetic Materials???). Or am I wrong
nofear02
13-09-2007, 23:35
It is just AMAZING!! That you think, and try, and test, and alter, and that you found this improvement and fixed it it en it perfectly works! Chapeau! Well done. When i see the pics of the old and new fan, i think immediately at the old ones, what a silly, tiny, sad, simple fan, you can easlily see the new ones are modern, better, greater production. Splendid!
Best part of all this work, I should say: the testdrives! :
Very interesting to read JWA! Like that you can fix some parts of your car by just DO and HOPE that it will work :) Not straight to the garage with your car, but first have a look at it yourself.
Not an option for a lot of other Ferrari owners here, but when you have some experience, knowledge and skills for this... Must be a great feeling that you can repair such things yourself. That it works even better than it ever did (after a little trial and error :D)!
The only thing that looked strange to me was the photo with the old and the new fan next to each other. That your new fan can move a lot more air for cooling is clear for me, but the old one looks more MASSIVE to me. Isn't that new one a little bit more fragile? And has it enough power? The old one has a big engine and the new one doesn't. AND the old one seems to be made of stronger materials (steel blades?), than the new one (synthetic Materials???). Or am I wrong?
Remember there is a 25 year age diference between these motors.
Modern motors are smaller, lighter, use less power yet are stronger than the old ones.
The plastics these fans are made from are very strong an light.
In some cases they even mount these fans straight to the radiator with special pins going through the core of the radiator.
The blades of the old fan are some kind of plastic to
It is just AMAZING!! That you think, and try, and test, and alter, and that you found this improvement and fixed it it en it perfectly works! Chapeau! Well done. When i see the pics of the old and new fan, i think immediately at the old ones, what a silly, tiny, sad, simple fan, you can easlily see the new ones are modern, better, greater production. Splendid!
Best part of all this work, I should say: the testdrives! :D
Yes Robert the testdrive was the best :)
I wasn't able to drive the car for more than a month, i found the problem with the fans the moment i got back from the "van mast to mast rit"
You can understand it took me 21/2 hours to test the car :
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