UBP - Under Bonnet Pump - What it looks like inside

[rik007]

Here are some photos of what an Under Bonnet Pump looks like from a Rover 75 2002 CDT Tourer.

I guess over time perhaps that the motor windings get attracted and stuck to the magnets. Giving the pump a tap allows the motor to spin again?

Anyway hope its of interest,

Rich

[rik007]

P.S. the muck in the diesel is NOT from the pump it just happened to already be in the plastic dish I poored the contents into. The diesel was fresh and clear as it tipped out.

R.

[FrenchMike]

Hi Rich,

'Metalically' and hydraulically interesting BUT not explain the electrical fault !

In the same idea ,see the intank pump issue:

Roverpump.JPG


Mike

[rik007]

Maybe, but only posted for intrerest.

What electrical fault are you referring to?

Rich

[James.uk]

Interesting the way they used a sort of variation on the Geneva movement so one shaft drives the other, I've not seen that before. Clever innit..

The electric motor looks a pretty sturdy one. And the pump looks to be in very good condition as well, so what failed???
...

[FrenchMike]

Originally Posted by rik007

Maybe, but only posted for intrerest.

What electrical fault are you referring to?

Rich

I think,it is also caused by a worn commutator and brushes...

Try to dismantle the commutator side and take another pict !

Mike

[rik007]

Originally Posted by James.uk

Interesting the way they used a sort of variation on the Geneva movement so one shaft drives the other, I've not seen that before. Clever innit..

The electric motor looks a pretty sturdy one. And the pump looks to be in very good condition as well, so what failed???
...

I dont know to be honest James. Over the past 6mths the car has failed to start a couple of times. This time with the ignition on I tapped the UBP and it audibly sprang into life and the car started! So I simply assumed that at 98k miles it had done its time and being a nonrepair item I bought a new one from Jules.

I assume whatever the cause of the UBP fail, I there is no chance of prolonging the agony of spending £85.

Rich.

[James.uk]

Is there much play in the spindle bearing? and what is the bearing made of? Looks like just plastic in the pic..

I'm wondering if the armature is touching the field windings when stationary......................
...

[uk_dave&gill]

Originally Posted by James.uk

Interesting the way they used a sort of variation on the Geneva movement so one shaft drives the other..

I'd never heard of the "Geneva Movement" so I Googled it, and now I could watch this video for hours!

[Mike Noc]

Originally Posted by uk_dave&gill

I'd never heard of the "Geneva Movement" so I Googled it, and now I could watch this video for hours!

As you can see from the video Geneva drives are a form of indexing movement used in drive systems. The UBP looks more like a twin screw pump to me, which is itself a variation of the Archimedes pump.

Good set of photos Rich.

Mike