Don't know. Mine's on the floor of my garage waiting to be installed.

I read that CompressorWorks is the last manufacturer of "new" R4 compressors and other companies just rebrand them. But I've also seen new "Behr" compressors online, so who knows (except maybe Behr, or Delphi...).

They've got a website, say their stuff is assembled in Dallas, etc etc.
http://www.compressorworks.com/default.aspx?page=Rfour

And buy a new hammer before you hurt yourself!

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.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

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!

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

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

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg

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.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

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.

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

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.

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airedale2 Welcome to Texas
1984 MB 300D 266,000
1993 Nissan PU 271,000
2002 Tahoe 122,000
2004 VW TDI 75,000

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

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

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?