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MG MGB Technical - Replacement cooling fan motor

That's what I searched the archives for (in combinations)and couldn't find squat.

Surely someone knows of a replacement for the 12vdc, 3 inch body, and 1/4 inch shaft electric cooling fan motors equipped from 76 or 77 on.

Can anyone think of a better search, or does anyone know of a motor which would make for a suitable, more economical replacement?

Thanks

Mike

Mike Phillips

Mike,

I have had good luck on ebay getting used mg parts. My wife accuses me of sneaking another MG into the garage via parts from EBAY. Fan motors show up regularly there.

John
J Long

Hey Mike
Try the fans from a Saab 900.
They fit and are more water and dust-protected.
Manfried
Manfried

I found the fans on an 80 - LE I once owned, just needed to be taken apart and cleaned up.

For some reason, there were no caps on the shaft, which allowed grit, oil and other assorted stuff to work its way into the bushings and brushes/armature -- which messed up operation.

It's just a typical DC motor, very similar to a generator, so it's really not that difficult.

A look at any parts book with an exploded generator will give you a very good idea of what's inside --- and there are bound to be other posts and/or people on DC motor rebuilds.
glg

Any local automotive generator shop could probably rebuild it for you - if that's even needed. I thought one of my needed new bushings, so I took it to the shop. For $10, they cleaned it up, lubed it and pronounced the bushings in good heath. So far, it's still working just fine...
J.G. Reed

Mike, Finding a substitute with a 1/4" shaft may be a problem. Lots of Bosch fans used on VW Rabbit's and Audi's are 3" diameter, I have used them to replace the less efficient Lucas fans used on Jensen Interceptor's. If you want to use your fan blade the Bosch shaft is around .310". The Bosch fans I used have 11" blades, I don't know the size of the MGB blades but I'm sure they are smaller than 11". Another possibility is a Yugo fan (don't laugh), they have 10" blades and some people use them on later Interceptor's with 3 fans, (where did tthey find 3 Yugo's?). Hope this gives you some ideas. FWIW, I use a 12" Gate pusher fan from a Pugeout, sp? as the only cooling fan on my 68 MGB GT. Good luck, Clifton
Clifton Gordon

Thanks everyone for their input. Unfortunately, SAAB motors are more expensive here in the states than OEM replacement motors for MGs.
Rebuilding is also not an option for me.
I am also not interested in getting a used/rebuildable unit.

I think I found what I'm looking for in the Dayton model #2M197

http://www.grainger.com/Grainger/productdetail.jsp?xi=xi&ItemId=1611762115

Permanent Magnet DC Totally Enclosed Non-Ventilated Motor, HP 1/35, RPM 2350, Armature DC Voltage 12 VDC, Mounting Stud, Service Factor 1.00, Bearings Sleeve, Amps at Nameplate Volts 3.8, Thermal Protection None


Mike
Mike Phillips

Just don't clamp-down the bugger too tight to begin with!
Pappy's pappy

Mike, The Lucas fan motor speed should be 3500 to 4000 rpms, according to the Haynes MGB manual on page 63. The Dayton motor you are considering turns at 2350 rpm. I think it may move considerably less air than the Lucas motor, when using the same fan. Just my thoughts, with no scientific backup. Clifton
Clifton Gordon

Clifton

I'm hoping it will still cool OK. In my experience with electric motors, the RPM is directly tied to amps. They don't give the no-load rpm, so I'm assuming 2350 is at 3.8 amps. My fan blade may not put enough of a load on the motor to draw 3.8 amps. I think its an experiment worth $30.

Mike
Mike Phillips

This thread was discussed between 09/05/2003 and 11/05/2003

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