Z4-forum.com

Ok,

So had a zed here today that the (forum) owner bought with the roof inop.

Pulled it out and could SMELL it..

Was seized solid, even the end cap was a nightmare to get off..

The sponge and cables were visibly scorched!

Opening up the motor revealed more fire damage..
Motor wass behind repair due to the toasted board, so a refurb fitted and he was on his way.

Just another thing to be aware of, if the sponge had been dry, I think it would have gone up..

Mike

Lucky escape then by the look of it.

One time when not clearing drains probably saved the day!!

.......... and this all you critics of BMW's roof motor design, is why they chose to locate it in a water filled sump - it's a fire safety feature

Not if the drains were operating properly!!

The drains collecting water is a safety feature then!

Hi, I am the said owner, great to have the roof working as it should. Excellent job and very informative,thanks Mike.

this thread made me smile but.. wow bmw... what shocking design

Shouldn't it have been protected by a fuse?

EssexZed wrote: ↑Sun Sep 17, 2017 8:21 pm Shouldn't it have been protected by a fuse?

A fuse is designed to protect the wiring & not the appliance, the wires don't seem to have burnt so it's job done
Rob

So basically you could be buggered if it's dry and deffo buggered if it's wet
Confused

EssexZed wrote: ↑Sun Sep 17, 2017 8:21 pm Shouldn't it have been protected by a fuse?

Yes, it's controlled by two relays and a 40a maxi fuse, however I think that as the bottom bearing had seized due to the water, it was spinning said bearing in the endplate. Obviously a hardened steel ball spinning a several thousand RPM against a steel plate is going to produce some heat! The motor generally draws about 9 amps, but a 40a fuse would allow it to draw probably 50-60a without blowing.

Mike

Christ, I'm going fill my boot with water then

Drop a tea bag in there. Nice little cuppa-on-the-go.