Air con compressor noise

[Mustlust]

I have the original a/c setup and the compressor rattle and bangs like crazy. When I had it regased the technician said the old ones do rattle a lot. Also noticed that it draws heavily on rpm when switched on.
Q: are these units always rattley?
Q: can they be rebuilt or have worn internals that I can access? Sounds like bearings are shot.

For the paltry amount of difference the a/c makes, it's more trouble than it's worth, but in true Land Rover enthusiast fashion, keen to fix it if possible.
Phillip

[simmo]

its a reciprocating or rotary compressor ? If its a recip' its probably old and due for a birthday or replacement. Rotary piston should not make any noise.

[Mustlust]

The ac unit is an original RRC York compressor. Does anyone know if these compressors are serviceable... I.e., is there a rebuild kit available?
I am guessing the knocking comes from a worn bearing as it still works ok. The local ac bloke has given me a contact for a new one, but as always, would rather fix my existing unit if viable.