Purpose of the rubber and piece of metal in a water engine pump

[aprengo]

I would like to know the purpose of the rubber in the images fixed in a piece of metal.

Best Regards

Make i dont know
Model
Engine size/Type
Year
Mileage

 

[carmanmemoranda]

It's a timing belt with a water pump

 

[Burnerman]

The rubber bit is a cushion so the timing belt cover doesn’t vibrate..............
I think!
John

 

[carmanmemoranda]

The rubber bit is a cushion so the timing belt cover doesn’t vibrate..............
I think!
John

I'm confused. What are you looking at that I'm not seeing ?

 

[BlueLoo]

Timing belt and idle pulley in rubber to reduce noise.
May be a tensioner as well but hard to see.

 

[Burnerman]

I don’t really get this one......all water pumps that I can recall have been toothed.
It’s only tensioners that run on the back of the belt, but what do I know?
John

 

[Burnerman]

I'm confused. What are you looking at that I'm not seeing ?

A rubber plug, inserted onto the casting....I can’t really see any genuine use for it, but the Subaru boxer engine has a few of these if I remember. The belt cover used to buzz like hell on these.
John

 

[Avocet]

I don’t really get this one......all water pumps that I can recall have been toothed.
It’s only tensioners that run on the back of the belt, but what do I know?
John

I think there's a move away from toothed water pump pulleys so that if the pump seizes, (either due to mechanical failure or insufficient antifreeze on a cold morning), it doesn't take your valvetrain with it!

 

[baldykev]

Face of belt drives the water pump, in case of water pump failure the belt will not be damaged (in theory) if it was a tooth drive on pump it would.
I cant remember but some cars used the water pump for the tension of the timing belt(been some time now) lol

 

[Burnerman]

I think there's a move away from toothed water pump pulleys so that if the pump seizes, (either due to mechanical failure or insufficient antifreeze on a cold morning), it doesn't take your valvetrain with it!

That's a new one on me.....I haven't had the pleasure so far!
John

 

[aprengo]

Good news. I have an old kit, because the new don't have the rubber or the special piece :

I will attach more next post

 

[aprengo]

other files attached :

 

[aprengo]

more attached files

 

[aprengo]

At the present times the distribution kit don't have the rubber or the special piece....

 

[Mottie]

I cant remember but some cars used the water pump for the tension of the timing belt(been some time now) lol

Some Vauxhalls did. I only remember that as I was having a sort out of my tool boxes the other day and found a special spanner that I used to adjust them with. This type: