dissembling R4 compressor - Page 3 - PeachParts Mercedes-Benz Forum

funola · #31 07-08-2010, 01:04 PM

Quote:

Originally Posted by thayer

Funola,

Do you know whether the compressor you are dissassembling is a mercedes specific R4. Check out the upside down email I posted where the R4 for GM is mounted correctly and the r4 for mercedes is bottom mounted.

check that oil slinger (I'm assuming it spins so the lateral orientation wouldn't matter)

There should be a path for oil to travel into the moving parts that is orientation specific.

Let us know.

Kent

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.

funola · #32 07-08-2010, 03:13 PM

Quote:

Originally Posted by funola

I further disassembled the R4 with the broken collar. As can be seen in the video, there is plenty of space at the low point for a sump and oil to collect. The half moon part that I am turning the compressor by is an oil slinger!

Anyone know how to further disassemble it so I can get the pistons out? Do I need a special puller?

Click to play video!

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

leathermang · #33 07-08-2010, 04:23 PM

Yes , it is playing.

funola · #34 07-08-2010, 05:13 PM

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.

leathermang · #35 07-08-2010, 05:30 PM

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...

Yak · #36 07-08-2010, 07:24 PM

Quote:

Originally Posted by funola

When will you install yours? The hammer looks like the handle is loose but it is not. I drove the stakes in and it is tight.

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?

leathermang · #37 07-08-2010, 07:35 PM

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.

engatwork · #38 07-08-2010, 07:56 PM

Quote:

And buy a new hammer before you hurt yourself!

The sticker's still on that one

.

Thanks for the pictures and write up.

Yak · #39 07-08-2010, 09:24 PM

Quote:

Originally Posted by funola

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.

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?

funola · #40 07-08-2010, 09:52 PM

Quote:

Originally Posted by Yak

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.

airedale2 · #41 07-08-2010, 09:56 PM

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.

funola · #42 07-10-2010, 07:10 PM

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

funola · #43 07-10-2010, 07:11 PM

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

funola · #44 07-10-2010, 07:16 PM

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.

leathermang · #45 07-10-2010, 07:35 PM

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...