Author Topic: Alright guys, what's the secret?  (Read 5841 times)

thysonsacclaim

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Alright guys, what's the secret?
« on: 16 February 2011, 12:57 PM »
I've been trying to remove that bloody A/C compressor now for a long time. I've looked through all the forum posts I could find, my handbook and still no luck.

I've removed most of the bolts that hold the unit to the bracket, but I can't get to them all. So then i tried removing the bracket itself. I've undone two bolts in the front and two in the back that hold the bracket to the engine. It flexes a little, so I can see there must be only one or two bolts to remove but I absolutely cannot find them.

I've used a mirror, my fingers and cleaned up any gunk. There has to be more bolts, but I'm out of ideas as to where they are.

this is a bitch job..
Adam


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WGB

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Re: Alright guys, what's the secret?
« Reply #1 on: 16 February 2011, 02:32 PM »
I thought the 450 was easy - you should try the 6.9  ;D

Bill

thysonsacclaim

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Re: Alright guys, what's the secret?
« Reply #2 on: 16 February 2011, 02:46 PM »
I read some posts by you and others of that job and the 117 job. I wonder if the RHD and LHD cars are mounted the same way, just mirrored, or if it's different? These bolts require lots of dexterity and I need a universal joint to get to nearly all of them. At this point I'm considering the saws-all or blow torch!
Adam


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Big_Richard

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Re: Alright guys, what's the secret?
« Reply #3 on: 16 February 2011, 02:48 PM »
Dont destroy anything yet ;)

when in doubt, look at the EPC and the bracket will probably show the bolt holes etc.

I will be able to post up a picture much later on.

thysonsacclaim

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Re: Alright guys, what's the secret?
« Reply #4 on: 16 February 2011, 02:58 PM »
Surely it doesn't help that  the manuals basically say:

Step 1: Remove rear bolts
Step 2: Remove front bolts
Step 3: Pull compressor out

Installation is reverse of removal.


I'll check the EPC in a bit. My hands are in need of a good cleaning (I shouldn't even be typing this)! Hahaha  ::)
Adam


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koan

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Re: Alright guys, what's the secret?
« Reply #5 on: 16 February 2011, 03:07 PM »
I have the MB A/C book that covers in detail removing of compressor from 116/117 engines with pictures, 5 pages.

I can scan and email them to you if you wish.

PM a real address if yes.

koan
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WGB

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Re: Alright guys, what's the secret?
« Reply #6 on: 16 February 2011, 05:16 PM »
I read some posts by you and others of that job and the 117 job. I wonder if the RHD and LHD cars are mounted the same way, just mirrored, or if it's different? These bolts require lots of dexterity and I need a universal joint to get to nearly all of them. At this point I'm considering the saws-all or blow torch!

Which side of the motor is your compressor. A RHD 450 has it on the left side of the motor (Your driver's side in a LHD) while a RHD 6.9 has it on the right side. A RHD 6.9 uses the US receiver-drier which is a mirror image of the RHD 450 receiver-drier(Which is the only one listed and available in Australia - but it doesn't fit a 6.9).

That right sided installation is a pig of a job and I removed mine with battery tray removed and about 1mm space to squeeze the compressor in and out. I later received a copy of the 6.9 M100 engine manual (which is now available at this site) and it described removing the compressor and mount as a unit. I removed mine without the frame and the hardest job was fitting the last bolt on the rear of the frame into the compressor itself.

If you are fitting a new A6 compressor check the rear mounting bolt as some are metric and some are not and you don't need to find out when you are upside down taking the weight of the compressor with one hand and using your "reversible fingers" to start the rear bolt .

There is also a pictorial on the topklasse site where a husband and wife replaced one using a small hoist.

Bill

jbrasile

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Re: Alright guys, what's the secret?
« Reply #7 on: 16 February 2011, 05:40 PM »
Adam,

I followed as my mechanic removed the compressor out of my 78 450SEL and there is an allen bolt if I am not mistaken that is covered by the main engine pulley. That pulley has a notch that is there for the purpose of removing this bolt. You need to manually turn the engine until the notch lines up and voila. I think that is the trick..

By the way, all compressors on 116's are mounted in the same position regardless of the car being LHD or RHD, the hoses are routed differently according to version.

Joe

thysonsacclaim

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Re: Alright guys, what's the secret?
« Reply #8 on: 16 February 2011, 05:54 PM »
Yes it's on Left hand. Wasn't sure if there was a difference between models or not. The pulleys, radiator and all the front stuff is removed already. Just the compressor there in the way of the timing cover, which is what I'm after.

I did see what looked like an allen bolt on the rear of the compressor, but I saw no easy way of getting to it and it was getting dark. It looked like it fastens the compressor to the bracket, but I'm not sure.

This stuff's gonna be a pain to put back on, so I'm replacing all that I can so I haven't got to repeat this god awful job again.
Adam


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jbrasile

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Re: Alright guys, what's the secret?
« Reply #9 on: 17 February 2011, 03:46 AM »
Yes Adam, I believe that rear bolt needs to come out as well. Now thinking back, he used a short allen to gain access, sorry if I can't be more specific. It wasn't that hard to get it out and actually putting it back was easier than removing.

Tks,

Joe

TJ 450

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Re: Alright guys, what's the secret?
« Reply #10 on: 17 February 2011, 03:59 AM »
I no longer have a 450 engine, but if I remember correctly, there  are two bolts at the rear of the compressor, and three at the front holding it on.

Tim
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1969 300SEL 6.3 1394
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s class

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Re: Alright guys, what's the secret?
« Reply #11 on: 17 February 2011, 04:18 AM »
I recently removed the compressor and bracket from a RHD 350SE.  They are still lying loose, so I can get photos of the arrangement for you, if it helps. 

'76 6.9 Euro, '78 6.9 AMG, '80 280SE, '74 350SE, '82 500SEL euro full hydro, '83 500SEL euro full hydro , '81 500SL

koan

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Re: Alright guys, what's the secret?
« Reply #12 on: 17 February 2011, 07:08 AM »
Sent the pages to "thysonsacclaim", detailed instructions, he should have it out by now ;)

I've had the compressor off my 6.9 a couple of times. My approach is to remove alternator and smog pump, unbolt the bracket and lift compressor with bracket and plumbing attached up and out. Worst part is getting at the bolt that goes through the bracket into the side of the block, about 1/2 long the bracket.

koan
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thysonsacclaim

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Re: Alright guys, what's the secret?
« Reply #13 on: 17 February 2011, 02:39 PM »
Many thanks to Koan for the manual pictures and to all you for your suggestions. I want to get the car right as much as I can while it's apart. When I've got it back together, I'll be hard pressed to want to do much on it for a while (too excited to drive it!)
Adam


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oscar

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Re: Alright guys, what's the secret?
« Reply #14 on: 18 February 2011, 08:17 PM »
Surely it doesn't help that  the manuals basically say:

Step 1: Remove rear bolts
Step 2: Remove front bolts
Step 3: Pull compressor out

Installation is reverse of removal.

 :D  My least favourite non-descript style of instructions. 
I replaced one on my 350 and the only way I could work out to do it was a mix of socket extensions and cv joints then 1/4 turns or less of a ratchet handle at a time...  I did plan on taking photos but the job was such a PITA that I'm surprised I didn't go nuts in the process.  I thought the above quote is particuarly correct when it refers to installation.  As big a PITA as removal ;D   

BTW, I'm not disagreeing with anyone if they said they found the process easier and not trying to talk you into not doing it, I just had a prick of a time removing is all, my main issue being access to the fastners and lack of room to turn them with any decent leverage.  It's never taken me so long to undo the small number of bolts required to remove the compressor.  I too had to remove the bracket with compressor as one. 

The biggest kick in the nuts afterwards was finding this in the garage a week or more later.   Compressor oil on the floor.  I took the belt off and haven't been game to rectify the issue since.

1973 350SE, my first & fave