Finally, it came to the last element of the air conditioning system - the compressor.
I have three of them. All for BMW E30 with an M20 engine with a pulley for a "V" belt.

The first.

The second.

The third.

The first one that was purchased in the air conditioner kit is a BOSCH BEHR compressor for R12 freon. Apparently this is an earlier version, without an oil temperature sensor on the compressor housing and with a 1-pin connector.

Although, judging by the ETM wiring diagrams, it is the opposite - early compressors were with this sensor, and later ones without it. It is not very clear, but in fact later compressors usually, after all, have this sensor.
I have already told the sad story of the previous owners about installing this compressor with a mount for the M20 motor on the M42 motor, using a homemade "adapter". I don't know what was the reason - this "adapter", or maybe some kind of accident, but the compressor was thrown out, along with parts of its housing.

Over the years, everything there has rusted to death. Of course, it's junk.
Therefore, I immediately bought another compressor - SEIKO. And even started to disassemble it a little.

But from the remnants of the text on the stickers, I realized that it is for freon R134a. Moreover, it was all wet and covered in grease with a green fluorescent dye - that is, it was definitely leaking, and quite a lot. It definitely needs repair.
So I bought a third compressor - again BOSCH BEHR for R12 freon, but a little newer, removed from a BMW E34. It already has a compressor oil temperature sensor and a 3-pin connector installed.

The difference between the first and third compressors is precisely the presence of this sensor and its wiring. The first still has a valve on the inlet fitting for pumping, while the third does not. Structurally, they are identical.

So, I will install the third one.
I have never dealt with these compressors before, so I started looking for information on the Internet. I read that very often a lot of dirt collects in the compressor, which can get into the entire system after it is started. Since my entire system is clean and assembled from scratch, I really would not like this! So, I decided to disassemble and clean the compressor before installation, just in case. I turned to specially trained specialists. ) But all of them, having heard about the 40-year-old compressor for the BMW E30, which had been lying idle for many years, advised me to throw it away and find a new one ))) And when I told them about R12 freon, they almost didn't send me! )))
Therefore, as always - if you want to do something well - do it yourself! )
I started looking for information on repairing such compressors. I only found some articles with randomly placed photos, but practically no text explanations. I don't understand why I make such "reports" if they are of no practical use to anyone... Well, that's it.... That's why I always write in great detail! Maybe sometimes, even too much... ;)
So, not finding anything, I decided to "practice" on my first broken compressor. After all, it won't get any worse from this! ))
Since it was just a "practice", I will write the same stupid "report" as I found on the Internet! )) Just photos and a minimum of text.
A normal report will be when disassembling a working compressor.
So, let's start with the simplest thing - remove the inlet fitting and unscrew the electromagnetic coupling diode.


There's a check valve inside - it's a complete mess! )


We unscrew 8 nuts, but the cover doesn't come off. Inside you can also see a whole trash...

You need to unscrew 4 more bolts. To do this, you first need to remove the pulley and the clutch.

The bolt on the pulley unscrewed easily. At first I thought that the pulley unscrews along the internal thread. It turned out that it doesn't. In general, it is not clear why that thread is there. By trial and error, it turned out that the pulley simply comes off upwards. But no pullers will help - there is nothing to catch and rest against. So I removed it this way - carefully driving a screwdriver in a circle between the pulley and the pressure plate.

And it worked.

Unscrew the nut and remove the pulley. It's easy.


Unscrew and remove the electromagnetic clutch with the wiring.



Now you can unscrew the 4 bolts.

But they are VERY tight! So the disassembly stopped for a while...


These bolts were unscrewed only with an impact wrench.

We remove the cover and see this picture! )) In this case, the experts were 100% right )) Although, it was obvious... ) But here the whole point is in "training" ))

We knock out the key and remove the gland with seals.





Remove the remaining sealant from the lid.

Remove the sleeve from the cover.


There is also a seal in it.

This concludes the "training".

Further disassembly is possible, except with the help of a "grinder"! ))




But that doesn't make sense anymore.
Especially since I still found normal reports on the repair of such a compressor on old American forums.
Next time I will disassemble a working compressor.













































Each new car from the factory was equipped with a tag containing basic information about the car - VIN code, model, color and type of interior upholstery, body color, production date with an accuracy of up to the minute, additional option codes and some other factory codes and contract and order numbers.
























































































































































Leave a comment: