Stott
|
| posted on 20/8/10 at 09:43 AM |
|
|
Air Con Help
Hi all,
does anyone know what type of pulley this is and how it works?
LINK
I have one on my a/c compressor and the centre is stationary while the outer rotates. I have read it's like a shear coupling of sorts to avoid
throwing the belt off if the pump seized. It's not a clutch pulley (as listed in the link above) as there are no connections to or near it, just
the control valve connection on the back of the compressor.
I'm pretty sure it should all be spinning, any ideas?
Background info on this thread THREAD bottom of pg2 & pg3
Thanks in advance, Stott
|
|
|
|
|
MikeRJ
|
| posted on 20/8/10 at 11:56 AM |
|
|
quote:
Originally posted by Stott
It's not a clutch pulley (as listed in the link above) as there are no connections to or near it, just the control valve connection on the back
of the compressor.
They are electromagnetic clutches, there are no connections to the pulley, just a solenoid which is mounted on the end of the pump. This is almost
certainly what the wire on the back of the pump will be for.
|
|
|
Stott
|
| posted on 20/8/10 at 01:21 PM |
|
|
No unfortunately it's not an electromagnetic clutch, it's just a shear coupling thingy.
The connection on the compressor is for one of these:
LINK This is the only connection to
the pump, in these systems the pump runs constantly at a very small displacement so even when the a/c is off the gas & oil circulate to help the
seals etc. Rather than a clutched pump which only runs on demand.
It's a clutchless variable displacement compressor
I've worked on clutched ones before and understand the principle but this isn't one I'm afraid.
Cheers anyway
Stott
|
|
|
Stott
|
| posted on 20/8/10 at 01:44 PM |
|
|
Just figured it out I think.
Looked at another vRS and the whole pulley spins all the time with the engine regardless of whether a/c is on or not.
When the engine is off it's not possible to spin the centre by hand as it's linked to the outer and therefore the belt. On my car, it
never spins with the engine but it spins freely by hand independantly of the outer, so it looks like it's sheared internally, new pulley
required, cheers
Stott
|
|
|
