[W126 Coupe] Nippondenso Compressor

[Dan Gardner]

 Hi Guys

    Many thanks  for your very detailed and comprehensive information I will 
file it in my "keeper"section.

    I suppose the first thing is to pull out the Compressor and inspect 
it.Compressor's that I have seen go "Rattly" and ultimately seize have been 
regassed many times with refrigerant but have not had     the correct ratio 
of oil added.

    ,Auto A/C is here is considered a necessity as its is currently 38 deg C 
(101 F) here in Western Australia and in March it will peak at 45deg 
C.Without effective A/C you exit your car at the end
    of a journey looking like a damp rag!!

    The whole country is in a state of extremes at the moment with 
horrendous flooding in

    the Eastern Seaboard ,10 people have lost their lives with a possible 80 
more who are missing. Here in the West we have had severe bush 
fires(deliberately lit) resulting in loss
    of homes & property but thankfully no lives.


                                                                             
                                            Kind Regards Dan Gardner 
1986 560 SEC Euro (220 kw)

> ----------------------------------------------------------------------

>

> Message: 1

> Date: Tue, 11 Jan 2011 14:42:18 +0800

> From: "Dan Gardner" <cruftsk9 at tpg.com.au>

> Subject: Re: [W126 Coupe] Nippondenso Compressor

> To: <mbcoupes at mbcoupes.com>

> Message-ID: <44906ADB9DB6409F842E579E9279B8D7 at dane9tuc6ffoy5>

> Content-Type: text/plain; format=flowed; charset="iso-8859-1";

> reply-type=original

>

> Hi Folks

>    Going back a couple of years,I had a R134a conversion by a mobile

> "German Factory Trained"mechanic who turned out to be illegal, 

> unregistered

> and let the R12 into the atmosphere(I could have done that and saved a 

> huge

> amount of money but trying to be a "Greenie"I got this clown!!).It didnt

> last long as a hose had swelled up.So I replaced the hoses with the 

> correct

> ones for R134A and fitted new "O" rings which were also compatable.Had it

> pressure tested and regassed once again it didnt last long as now it has

> compressor seal leak.The A/C shop is quoting me $1200 to replace the

> Compressor(Non Genuine) with a new one,claiming rebuilt ones dont last.

>

>    So I have a few choices

>

>    1/Replace the seals on the comp(shaft wear may be an issue) myself 

> refit

> and then get regassed

>    2/Buy a new aftermarket  comp

>    3/Buy a new Nippondenso comp

>

>    I don't use this car a lot,mainly for car club use and the occasional

> weekend so the A/C seal may be prone to drying out.Any advise welcome

>

>

>

>                    Kind Regards Dan Gardner 1986  560SEC  Euro (220kw)

>

>

>

> ------------------------------

>

> Message: 2

> Date: Tue, 11 Jan 2011 06:57:45 -0500

> From: "Chet Hwilka" <chwilka at comcast.net>

> Subject: Re: [W126 Coupe] Nippondenso Compressor

> To: "'Dan Gardner'" <cruftsk9 at tpg.com.au>, "'Mercedes Coupes Mailing

> Lists'" <mbcoupes at mbcoupes.com>

> Message-ID: <53852EADAF2647F19D789B9FAAB7BB8B at Chethp>

> Content-Type: text/plain; charset="us-ascii"

>

> Hi Dan;

>

> I went through this with my wife's 190E (similar A/C system).  I started 

> by

> simply recharging with the R134A kit, but eventually had to tear down the

> whole system.

> http://home.comcast.net/~chwilka/ac_system_tear_down_and_rebuild.htm

>

> I cleaned/flushed everything up as best I could, but the compressor 

> started

> making noise, so I tore it down again and replaced the compressor with a

> used one.

>

> Good Luck

> Chet

>

>

>

>

>

> ------------------------------

>

> Message: 3

> Date: Tue, 11 Jan 2011 05:17:33 -0800

> From: Michael Ramay <mike.ramay at gmail.com>

> Subject: Re: [W126 Coupe] Nippondenso Compressor

> To: Dan Gardner <cruftsk9 at tpg.com.au>, Mercedes Coupes Mailing Lists

> <mbcoupes at mbcoupes.com>

> Message-ID:

> <AANLkTikSaR=MXwLv3YoMsA7=SbV8FmcgSkTQBERO0ZpY at mail.gmail.com>

> Content-Type: text/plain; charset="iso-8859-1"

>

> Are you sure the leak is on the compressor shaft? Every leak I've seen (in

> my minimal experience) is at the lump on top of the compressor where the

> refrigerant lines are connected. There are four o-rings inside that lump 

> and

> two for the external lines. It is a DIY to replace them. My 560SEL is on

> it's 7th year with the "wrong" (neoprene) o-rings in there and my SEC is 

> on

> it's third with the right (viton) o-rings in that lump. In both cases the

> high pressure side o-rings were shredded.

>

> I'd be VERY tempted to get a salvage yard compressor that turned smoothly 

> by

> hand, put in some new o-rings into the lump, and give it a go.

>

> Mike (in generally HOT Las Vegas)

>

> On Mon, Jan 10, 2011 at 10:42 PM, Dan Gardner <cruftsk9 at tpg.com.au> wrote:

>

>> Hi Folks

>>   Going back a couple of years,I had a R134a conversion by a mobile 

>> "German

>> Factory Trained"mechanic who turned out to be illegal, unregistered and 

>> let

>> the R12 into the atmosphere(I could have done that and saved a huge 

>> amount

>> of money but trying to be a "Greenie"I got this clown!!).It didnt last 

>> long

>> as a hose had swelled up.So I replaced the hoses with the correct ones 

>> for

>> R134A and fitted new "O" rings which were also compatable.Had it pressure

>> tested and regassed once again it didnt last long as now it has 

>> compressor

>> seal leak.The A/C shop is quoting me $1200 to replace the Compressor(Non

>> Genuine) with a new one,claiming rebuilt ones dont last.

>>

>>   So I have a few choices

>>

>>   1/Replace the seals on the comp(shaft wear may be an issue) myself 

>> refit

>> and then get regassed

>>   2/Buy a new aftermarket  comp

>>   3/Buy a new Nippondenso comp

>>

>>   I don't use this car a lot,mainly for car club use and the occasional

>> weekend so the A/C seal may be prone to drying out.Any advise welcome

>>

>>

>>

>>                   Kind Regards Dan Gardner 1986  560SEC  Euro (220kw)

>> The MB Coupes Website!

>> W126 SEC Mailing List

>> Postings remain property of MB Coupes, L.L.C.

>>

>

>

>

> -- 

> Mike Ramay

> cell: (702) 494-8056

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>

> Message: 4

> Date: Tue, 11 Jan 2011 09:32:59 -0500

> From: Dick Spellman <dick.spellman at gmail.com>

> Subject: Re: [W126 Coupe] Nippondenso Compressor

> To: Dan Gardner <cruftsk9 at tpg.com.au>, Mercedes Coupes Mailing Lists

> <mbcoupes at mbcoupes.com>

> Message-ID: <4D2C6A1B.2070109 at gmail.com>

> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

>

> Hi Dan,

>

> Chet's instructions and 'various pictures' will prove useful.  If you go

> to the last image on the right and look closely you will see the four

> hex bolts that hold the top cover on the compressor in place.  Under

> this cover are either 4 o-rings or a rubber molded maze that holds all 4

> o-rings together so it is a one piece replacement of all the rubber 

> o-rings.

>

> I have never done the detail of work Chet shows but thanks Chet, that's

> a keeper for somewhere down the road.  I did follow a set of

> instructions from Mike Ramay 7-8 years ago and replaced the  o-rings

> under that top cover using a kit labeled 'Asian Compressor Seals' and a

> small bottle of NYLOG o-ring sealant.  I went directly to MB dealer for

> the (2) manifold seals where the hoses are fitted.  The Nylog goo will

> help to hold the rings in place at the hose manifold.

>

> I did replace the receiver/dryer and expansion valve (this valve is a

> PIA).  I added 2.5 ounces of PAG46 directly to the compressor on

> re-assembly of the top cover and 1.5 ounces into the low pressure hose

> valve immediately after vacuuming the system down.   When I vac'd the

> system down, I let it sit overnight with gauges to see if there were any

> leaks.  With none found, recharged with R-134a.  I set the low side

> pressures at 80F to the high side of the scale.  Don't have my notes on

> this handy but, think low pressure 45 or so.

>

> This system I still have running is a Nipponsenso 10P17?? and  blows 40F

> at the center vents on MAX with fresh air door RECIRC (if so equipped)

> flap closed.  I also did all vacuum elements at the same time.  All but

> one vac element rubber diaphragm had failed after so many years.  Even a

> small crack in a diaphragm will prevent proper pull of the flap

> linkages. I do believe a number of warm air complaints can be attributed

> to the fresh air door vac elements (2) leaking and/or the center

> vent/defrost vac element leaking.  So, if you are going to do the

> compressor, plan on doing the vac elements for good measure so hopefully

> you get another 10 years without a problem.  I will mention, I pretty

> much looked to zero clock the ACC systems on these rebuilds and

> tested/replaced the ACC pushbutton unit, heater solenoid valve, aux heat

> coolant pump.  In every case, I have replaced the ACC push button and

> mono-valve.  Only one aux heat pump showed bad and needed replacing.

>

> If you do choose to rebuild the compressor, I used Arizona Air for the

> Asian 'gasket' kit and Nylog <http://www.ackits.com/>.   Vac elements

> were Performance Analysis Co. </GEORGE MURPHY/. (865) 482-9175 (Voice or

> Fax) M-F 9am to 5pm ET  george_murphy at compuserve.com.>

>

> The only other caution worth mentioning is that on occasion the

> compressor clutch will fail (chatter is typically heard) and rebuilding

> this may be necessary.  I'd guess doing it all at once makes good sense.

>

> Rebuilt compressors with new clutch can be found here in the US for

> <than $400 too.

>

> Good luck,

> Dick

> in Boston, MA USA where it's gonna snow and snow some more

>

>

>

> On 1/11/2011 1:42 AM, Dan Gardner wrote:

>> Hi Folks

>>    Going back a couple of years,I had a R134a conversion by a mobile

>> "German Factory Trained"mechanic who turned out to be illegal,

>> unregistered and let the R12 into the atmosphere(I could have done

>> that and saved a huge amount of money but trying to be a "Greenie"I

>> got this clown!!).It didnt last long as a hose had swelled up.So I

>> replaced the hoses with the correct ones for R134A and fitted new "O"

>> rings which were also compatable.Had it pressure tested and regassed

>> once again it didnt last long as now it has compressor seal leak.The

>> A/C shop is quoting me $1200 to replace the Compressor(Non Genuine)

>> with a new one,claiming rebuilt ones dont last.

>>

>>    So I have a few choices

>>

>>    1/Replace the seals on the comp(shaft wear may be an issue) myself

>> refit and then get regassed

>>    2/Buy a new aftermarket  comp

>>    3/Buy a new Nippondenso comp

>>

>>    I don't use this car a lot,mainly for car club use and the

>> occasional weekend so the A/C seal may be prone to drying out.Any

>> advise welcome

>>

>>

>>

>>                    Kind Regards Dan Gardner 1986  560SEC  Euro (220kw)

>> The MB Coupes Website!

>> W126 SEC Mailing List

>> Postings remain property of MB Coupes, L.L.C.

>

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> W126 SEC Coupes

> Postings remain property of MB Coupes, L.L.C.

>

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