Bolt holding hoses to back bracket of R4 compressor - PeachParts Mercedes-Benz Forum

cook · #1 05-01-2012, 07:08 PM

On the W123 R4 compressor, there is a bolt that runs the length of the compressor and screws into the back of it. It also holds a bracket that is for the hoses. The bracket should have 2 bolts in it to that stabilize the hoses. Does anyone know what size those bolts should be? (Thread size and length) Mine are gone.

vstech · #2 05-01-2012, 07:46 PM

... I'm unfamiliar with any bolt that goes through the compressor and attaches to any hoses.
the 123 has 3 bolts that secure the back of the compressor to the bracket affixed to the engine block.
the 4th hole that passes through the body of the compressor does not connect to anything on the MB... there is a bracket connected to the compressor mount that holds the lines, and there is a bolt that screws into the hole in the welded junction of the two hoses...
there is also a small bolt that secures the a/c manifold to the back of the compressor...

which bolt are you asking for?

cook · #3 05-01-2012, 08:08 PM

I borowed this picture from another post.

It is the bolt in the center of the picture, and you can see the bracket that holds the hoses too. The bracket holds the fat AC line going down next to the bolt/bracket.

This is my first try at posting a picture, so I hope it works.

vstech · #4 05-01-2012, 08:13 PM

ok, so you need the bolt, and likely the bracket it passes through as well.
it does not connect to the hoses, but it holds the bracket that the hoses are bolted to...

cook · #5 05-01-2012, 08:32 PM

I dont need the big bolt that goes into the compressor, but there are 2 little bolts that hold the 2 parts of the bracket in place so the AC hose/pipe does not move. I need the size of the 2 little bolts. I am assuming there are supposed to be bolts holding the 2 sides of the bracket against the hose.

cook · #6 05-02-2012, 10:53 AM

Would the EPC have the info I need? I've not used it before, but maybe it is time to sign up?

Yak · #7 05-02-2012, 06:53 PM

That pic is from my post here: Installing a CompressorWorks R4 into a W123

I think that bracket is for the oil cooler lines, as described in the text in post 7 and 8.

The bolt that goes through the compressor and supports the A/C manifold is much clearer in post 9.

The bolts associated with the pic you posted were 10 mm. That ought to make the threads maybe an M6 or M8, and I think they're all coarse? I'm guessing here. If you meant the bolt that holds the bracket to the compressor, that had 13 mm, ID'd in post three.

There ought to be blow-ups in EPC that ID the bolts, just make sure you're looking at the correct system: A/C or oil cooler line.

cook · #8 05-02-2012, 10:24 PM

Super. It is the 10mm bolts that I need, not the large one. Sorry I did not make that very clear. Thanks again!