Crankshaft Pulley - S3 Beta 1600 HPE

[A1.6HPE]

Hello all,
About to tackle a timing belt change on my Series 3 1600 Beta HPE (long bumpers and power steering).

I have got it into my head that some crankshaft pulleys have a bolt fitting and some have a nut fitting and that one type is a left-hand thread.
Perhaps I am thinking about Delta engines having a bolt?
I have this aide-memoire in my mind that Nut = Normal and BoLt = left-hand thread.

Can anyone give a definitive verdict on my troubled thoughts? 

Photograph of this nut on my car engine is attached.

TIA, Leo

[peteracs]

Hi

The nut is definitely normal thread, never seen a bolt.

Peter

[Nigel]

Leo,
You don't need to disturb that to change the belt. It's fiddly
to work the belt gently past the 'safety' guide, but
perfectly do-able.
Unless there's another reason....

Nigel

[A1.6HPE]

Hi

The nut is definitely normal thread, never seen a bolt.

Peter

Cheers Peter, thank you for your response.

Leo

[A1.6HPE]

Leo,
You don't need to disturb that to change the belt. It's fiddly
to work the belt gently past the 'safety' guide, but
perfectly do-able.
Unless there's another reason....

Nigel

Cheers Nigel,
I believe that "best practice" is to remove the pulley.

Leo

[peteracs]

Hi Leo

As Nigel says, it is possible, but having done both ways, I prefer to take the pulley off.

Peter

[A1.6HPE]

Hello Peter,
Agreed, I feel its best to remove the pulley so that removing old and fitting the new belt does not disturb anything. I know that a lot of people/garages simply cut the old belt but again, I prefer to reduce the risk of disturbing the pulley alignments once set up.

Each to their own of course, we all have our own way of working.

Leo

[A1.6HPE]

Just to round off this conversation, I removed the nut today and as above it is a normal thread and therefore released by anti-clockwise rotation.

Leo