300 sdl A/C compressor removal - PeachParts Mercedes-Benz Forum

brandlj · #1 07-06-2010, 09:27 PM

As I am getting together all of the parts to replace my seized A/C compressor on my 86 sdl I started looking over the area where the compressor lives. Here is my question, Has anyone out there replaced a Nippondenso compressor on their sdl? I realize it will come out through the bottom, BUT to disconnect the A/C lines from the compressor, did you remove the power steering pump to do this?
Thanks in advance

ah-kay · #2 07-06-2010, 11:15 PM

I removed the compressor with the A/C hose together. You can drop it down or take the whole bunch from the top. I did 2 cars and it is quite straight forwards.

I did not need to remove the power steering pump. Just remove the 4 bolts. IIRC, the bolts are of different length and 2 have an inserts.

brandlj · #3 07-07-2010, 08:24 AM

Quote:

Originally Posted by ah-kay

I removed the compressor with the A/C hose together. You can drop it down or take the whole bunch from the top. I did 2 cars and it is quite straight forwards.

I did not need to remove the power steering pump. Just remove the 4 bolts. IIRC, the bolts are of different length and 2 have an inserts.

So the A/C lines are long enough for the compressor to drop down and clear the power steering pump to disconnect the lines?

ah-kay · #4 07-07-2010, 12:30 PM

I cannot remember exactly how I did it but on both occasions I did NOT remove the power steering pump.

amosfella · #5 07-08-2010, 01:36 AM

You have to undo the AC lines at the large nuts, and take them out with the compressor. It is next to impossible to get the replacement o rings on without them being out.
Dont' ask me how I know, it still gives me nightmares....

brandlj · #6 07-08-2010, 08:24 AM

Quote:

Originally Posted by amosfella

You have to undo the AC lines at the large nuts, and take them out with the compressor. It is next to impossible to get the replacement o rings on without them being out.
Dont' ask me how I know, it still gives me nightmares....

Do you mean keep them attached at the compressor itself, but undo the lines further up the system, so You have the compressor and two lines attached to it to remove.

Then you would have a compressor with the suction and discharge lines attached to it sitting on the floor. Then you disconnect the lines at the compressor when it is out of the engine compartment?

Sorry if I sound dumb about this, I am just trying to research all of this before my plan of attack.

Thanks for the reply!

amosfella · #7 07-08-2010, 09:33 AM

Yes, the lines remain attached to the compressor when you take it out.

brandlj · #8 07-08-2010, 10:48 AM

Quote:

Originally Posted by amosfella

Yes, the lines remain attached to the compressor when you take it out.

This should make things easier when I flush the system. I did some diagnostic work last night and all of the electrical functions of the pressure switches, full throttle microswitch, fan switches, and KLIMA are working as they should. I have plenty of freon in the system, but my compressor apparently has the black plague. When I discharged a little bit of the freon from the high pressure line, it was BLACK. I am guessing that this is the Teflon that Nippondenso uses in their compressor. I will have to do a lot of flushing to get this goo out of my system.

vstech · #9 07-08-2010, 11:21 AM

I understand the "black plague" or "black death" in an automotive compressor to be broken down oil. from either contaminants or compressor wear and excessive heat.
flush entire system, replace compressor, and dryer, and txv and pray.
it's best to have the system flushed at a service station that has pulse flush system on hand... hard to just flush it out with liquid and air...

leathermang · #10 07-08-2010, 11:23 AM

[QUOTE=vstech;2501335]....hard to just flush it out with liquid and air.../QUOTE]

I know you really meant ' liquid and nitrogen' .....

vstech · #11 07-08-2010, 11:38 AM

of course that's what I mean, but the VAST majority of diy'ers out there use an air compressor to blow that stuff out. heck, it's what dieselgiant uses on his DIY of a flush.

leathermang · #12 07-08-2010, 12:36 PM

But it is something nice to mention... for those whom we might help get interested in deeper level attention to their project the more correct physics .. or to provide intellectual stimulation and to be more consistent in our recommendations... LOL

But remember, Diesel Giant also sold and promoted Freeze-12....
claimed at the first of the instructions that he was going to put R12 in...then presto, ' his R12 can was empty' and so he used Freeze-12 ... which he sells... and goes on to promote that as a good refrigerant.....