Kent, both R4's are OEM Mercedes Delco's afaik. The X does point to an oil hole.on the 4 bolt bearing plate. Since It's been removed, I couldn't tell it's orientation with respect to the compressor so I looked at my other R4, which ihas a different casting and does not have an X like the first R4. It does however, have a circle in the same location on the 4 bolt bearing plate, and the circcle is on top with respect to the compressor. Assuming the 2 marks are equivalent, the Merecedes R4's do have the bearing oil hole on top to allow grivity feed lubrication.

Is the video playing? I can't seem to play it on this computer (not mine).

Yes , it is playing.

I called uo Compressor Works (mfg of R4's) and asked about the sump. They insist it is sumpless. They said, for proper lubrication, there must be proper amount of refrigerant/oil mix and PROPER FLOW. I said there is a cavity in the bottom of the R4 that can hold oil and he says there may be 1/2 to 1 oz of oil in there. Anyway I am just going by what I see and I am sure Compressor Works is right. Maybe that 1/2 moon thing is a counter weight., but, if there is oil which touches the half moon, it will work as an oil slinger.

I have been preaching that because the R4 does not have a sump... that that makes the oil miscibility factor of a refrigerant which is used in them much more important than a refrigerant used in axial and other sump type compressors...

Probably next weekend for the install. My system is flushed and sitting there sealed up. Waiting on a part or two for a custom install.

I'm shoveling dirt for Homes for Our Troops (shameless plug) this weekend.

Doesn't anyone own ball peens anymore?

Ball Peens....
That was actually what I thought the reference to wrong hammer was directed to...
I do not think a nail claw hammer is made for ( the hardening process on the face ) anything except nails.... which are relatively soft ...
If you are striking a metal which is hardened itself other types of hammers.... are typically used.... for safety.

The sticker's still on that one:eek:.

Thanks for the pictures and write up.

How about a good pic of the inside of that cover plate?

I just checked my Harrison HR100T that was not OE, but may/may not have been an M-B repair and compared to the CompressorWorks. The Harrison has the X/casting on the top, as installed, and the CW will be on the bottom.

Is there some hole or channel on the inside of the cover? Mostly hemispherical?

I am out of town and won't be able to take pics till Saturday or Sunday. The hole is on the inside of the cover plate (with 4 bolt holes) right above the needle bearing/ seal. If the orientation of the hole is wrong, you can re-orient it by removing the 4 bolts and pulling the cover. I used a 3/8 breaker bar to tap it off but there must be a special puller for it.

compressor works
 

I recently replaced my R4 compressor in the benzo with a new compressor from compressor works. Went by the facilities since i work right around the corner. Talked to one of the reps, and all of the manufacturing is done on premise. They are also a direct supplier for delphi compressors and gm. Talked to the rep about x mark and bearing oil supply.

My compressor came with no x mark, but did instead have a flat spot where the x would have been placed in the appropriate position.

Very quiet operation, i cannot hear it run when on. Very solid component.

I thought about dis-assembly before throwing it in the trash. But it was enough with replacement. Glad some one else did it.

Pics of mark and oil hole
 

This is the "X" mark on the cover at 12 o'clock. It is part of the casting.

http://i31.photobucket.com/albums/c3...a/DSC00192.jpg

On the other side of the x you can see the oil hole.

http://i31.photobucket.com/albums/c3...a/DSC00190.jpg

I pulled the seal out for a better look at the hole. The white thing on the left is a spacer for the seal that's on its right. The seal is spring loaded. You can see the white background through the oil hole, which drips oil into the roller bearing and the seal if the x mark hole is on top.

http://i31.photobucket.com/albums/c3...a/DSC00199.jpg

Everyone needs to take their digital cameras out to their cars and take a picture of the top side of their AC compressor...
We need to see if this is standard....
Wish we could check some compressors which have failed to see if this was the problem..
of course ' failing' in this case would probably mean the front bearing and seal...
this being in the wrong position should not cause the compressor to self destruct in other manners... as would improper matching of oil and refrigerant...