Now that the compressor parts are clean and shiny let's start assembly. You will need a clean working environment, many clean textiles and of course new ester refrigerant oil.

left to right: compressor body, piston shaft, piston assembly

Insert piston assembly into compressor body. This is however a little tricky job.

It should look like that...

front part close - up (pulley side)

front part close - up (interior side)

Insert shaft into front part body. Be careful not to miss the bearing

Install new gasket on compressor body and apply some drops of clean refrigerant oil in the groove

Gradually tighten the screws in cross order

New shaft protective seal (left) and lip seal with O-ring (right)

Be sure to dip both parts into clean ester oil

Insert shaft protective seal and then lip seal ...

... lock ring to keep everything together ...

... and don't forget the felt ring on top.

Mount the electromagnetic coupling with the respective lock ring ...

... and the washers which actually adjust the air gap between pulley and pressure plate

Punch the pulley with a rubber hammer  ...

...until there is enough room for the lock ring to fit inside the groove

Measure the air gap between the pulley and pressure plate. It should be between 0.4 - 0.8 mm. If not then proceed adding or removing washers as seen above.

Finally restore clutch wiring clamp

Let's now move on assembling the rear part of the compressor.