Coolant Pump - disassembly

[epipete]

Given the price of replacing these things (money that can be better spent elsewhere) I thought I might take a look at why mine is not working with a view to a possible repair!

Picture 1 is the motor part, as can be seen there is a line indicating a point of separation to this component. Before I 'stick' a blade in and twist (and bugger the entire thing) has anyone else ever separated thes parts and if so how?

Picture 2 is the pump currently dismantled as far as is simple and obvious.


Thanks

Pete

[epipete]

Ok, didn't need to disassemble this item further, cleaned it up and found it works fine on the bench, have tested the relay which is also ok and the 5amp fuse but still it will not fire up when earthed!

I now recall removing some, seemingly superfluous, wiring to after market switch on the dashboard when I bought the car some years back so suspect that a previous owner might have modified the pump somehow, so now to do some reverse engineering!

[GeoffSmith]

You might want to replace those screws with stainless - two of mine were decidedly rust.

[epipete]

They seem to be ok, all the markings are off the label and so I'm not sure but think that it is a replacement pump of unknown make; the electrical supply has been professionally spliced so the wires at one plug are a different colour than at 'tother end.

[andy b]

I checked my water level and i dont think i put the cap on tight enough. i got stuck in traffic and steam came out from the header tank. i topped it up today and checked every thing. My fans do not come on until the temp needle is in the middle of the H i also checked the supply to the aux water pump i have supply but the pump does not run. please keep me informed on the out come. I have never checked to see if the car has a thermostat in place will this cause the temp to go so high before the fans kick in, The manual states 110deg c before operation. andy b
If you have never driven one dont knock it.

[Fourdoorcat]

Be careful about bench testing the pump. Mine worked fine on a 12VDC source and in the car before it got hot. Once the engine was up to temperature, the pump didn't pump and the fuse blew.

I dismantled it completely and found that the sloppy application of insulating varnish, which was dribbled on the armature, likely was the root cause of failure.

The gap between the armature and field is small. Once the varnish got hot and sticky it apparently was locking the armature sufficiently to cause the motor current to rise and blow the fuse.

Removal of the varnish can be done, but I didn't do it. I put in another pump.

Ken