Brand new water pump noise

[SuperV8]

Getting all the parts ready for my timing belt change on my EA288 TDI 184 - and my new genuine water pump arrived today.
Looks spot on - but when you spin the pulley you can hear a feint plastic scrapping noise.
Just wondering if anyone has pick up one of these and spun it in your hand - was it quiet or could you hear a similar noise?

Don't know if its 'designed like that' or faulty?

 

[BillyCool]

Can't comment specifically on the noise but those electronic water pumps are prone to failure and a lot of suppliers have stopped using them. The electronic actuator sticks and causing overheating problems. Mine failed and TPS gave my mechanic the option of one with or without and I went without. Not had an issue since.

 

[SuperV8]

Yes, I noticed a lot of OE number supersessions to the 'N' which is the latest which is the one I ordered. Went from 04L121011 - 04L121011E - L - P - 04L121011N so I was 'hoping' the later numbers have an update that made them more reliable!
It does have quite a strong return spring.
So i'm happy fitting an electro/mechanic pump - just this noise seems strange.
I'm used to rubber type bearing seals which are silent - I don't what sort of seal these pumps use?

 

[BillyCool]

Yes, I noticed a lot of OE number supersessions to the 'N' which is the latest which is the one I ordered. Went from 04L121011 - 04L121011E - L - P - 04L121011N so I was 'hoping' the later numbers have an update that made them more reliable!
It does have quite a strong return spring.
So i'm happy fitting an electro/mechanic pump - just this noise seems strange.
I'm used to rubber type bearing seals which are silent - I don't what sort of seal these pumps use?

I can't comment on the various versions, so like you say, hopefully yours is good to go. I just choose to go without on my new one.

Also don't know about the seals, so I've expended my limited knowledge!

Let us know how you get on with it.

 

[SuperV8]

I've had it confirmed by two different sources that this noise is normal for a brand new electro/mechanical pump.
They use the coolant as a lubricant so that would stop the noise.

Thinking out loud!
I bet the failures of these electro/mechanical pump mechanism is caused by the silica floating around in the coolant system (that blocks up the heater matrix) blocking up the shroud mechanism!