What is this on my pump?

Aup

Just been looking at my injection pump and this rubber cap thing fell off with a small washer inside.

What is it and what does it do?



Cheers Landy Lee

its the breather.
Tail goes down.

Cheers

neilly said:

its the breather.
Tail goes down.

Cheers

Click to expand...

Cheers

should the washer sit inside the metal part?

landy-lee said:

Cheers

should the washer sit inside the metal part?

Click to expand...

Yes it should.

Cheers

It is open to atmosphere to allow boost diaphragm to move down as turbo pressure increases. I think Bosch went a little over the top engineering it to keep shmoooo from entering as boost drops and pressure beneath diaphragm momentarily drops below ambient. Bung the washer back and tappy tap tap the housing to retain it then bung the rubber Johnny back on

Is that a gauze filter in the hole?

Blackburn said:

Is that a gauze filter in the hole?

Click to expand...

It is gauze and helps prevent oil from escaping along with the vented fumes, thats the theory.

Sadly they dont work if you do any deep water off road stuff, the fuel pin under the sliding piston will seize up.
Fine for road and light laning though.