Rear derailleur is rubbing cassette

[alewater]

Hi,

Newbie here.

Got my bike out today after not riding it for 3 years.

Fixed the rear flat tire and now the rear derailleur rubs against the cassette all the time, I don't remember it previously making that noise.

Google says I need to adjust the B Screw, I can tell you there is no B screw. There are two screws to adjust the H and L positions. Plus another that does literally nothing in any position.

I can't see what I'm missing, any ideas?

Thanks
A

 

[Ajax Bay]

Shimano Tourney RD. Has it got a model number somewhere eg RD-TY30? How many sprockets (?7) and what range (eg 14-28). How many positions on the rear shifter? How many clicks? Any text on the 'cable pulley wheel'?
Good pictures - thank you. Now please let's have two (bike the right way up) from the side: one with chain on large ring/large sprocket and one: small ring / small sprocket. Full chain in picture.

 

[the snail]

A bit hard to tell from the pics, but in the 2nd picture the derailleur cage looks bent, so maybe you need a new one, possibly the hanger is bent too?

 

[Ajax Bay]

I agree with @the snail - the RD cage's outer plate, down by the tension jockey wheel, is bent out. There should be almost no gap between the tab on the inner cage plate and the outer plate. And hanger verticality is worth checking too.
Doesn't solve the issue though.

 

[the snail]

Looking at the 4th pic, the chain doesn't seem to be engaged with the red jockey wheel either, so not surprising it's a bit noisy!

 

[alewater]

. Thanks guys, I’ll take some more pictures in the morning and get back to you

 

[alewater]

Looking at the 4th pic, the chain doesn't seem to be engaged with the red jockey wheel either, so not surprising it's a bit noisy!

Good spot, I noticed that and took another picture, looks like I uploaded the wrong version.

 

[Cycleops]

A bit hard to tell from the pics, but in the 2nd picture the derailleur cage looks bent, so maybe you need a new one, possibly the hanger is bent too?

I think that may be distortion from the wide angle cameras lens. Let’s see the new photos.

 

[fossyant]

The bent cage shouts a few worries, and also, the B screw is there on the rear of the mech - you need to screw it 'in'.

 

[figbat]

Google says I need to adjust the B Screw, I can tell you there is no B screw. There are two screws to adjust the H and L positions. Plus another that does literally nothing in any position.

 

[figbat]

This is definitely not right, by a long way. It's not a lens/perspective issue - that is a huge gap that shouldn't be there.

 

[figbat]

Shimano's instructions.

 

[gbb]

Its my opinion that unless you know something changed, you shouldnt generally ever need to adjust derailleur screws.
I assume 3 years ago it rode ok, now it doesnt. That screams something else is wrong and adjusting screws will only (in all likelihood) make two things wrong, even if it does kinda correct the original problem.
As i say at work, fix the original problem, try not to fudge it.

 

[Ajax Bay]

Size of largest sprocket please. @gbb - noone's suggesting adjusting the limit screws. My best guess, at this stage, is that the 'B' screw needs screwing in to drop the guide jockey wheel down, if that's what's rubbing. And we can see the 'B' screw is 'well out'.
The OP said "the rear derailleur rubs against the cassette all the time."

 

[gbb]

Size of largest sprocket please. @gbb - noone's suggesting adjusting the limit screws. My best guess, at this stage, is that the 'B' screw needs screwing in to drop the guide jockey wheel down, if that's what's rubbing. And we can see the 'B' screw is 'well out'.
The OP said "the rear derailleur rubs against the cassette all the time."

Adjusting screws mentioned by 3 contributors, OP included. My point is folk should carefully consider what's wrong before making adjustments or you could make things worse. 40 years of cycling I only ever had to adjust a RD once, when I fitted a new one. All things being even, they don't generally move on their own IME. Just an observation.