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  #1  
Old 11-12-2009, 09:21 AM
muleears's Avatar
Old MB Driver
 
Join Date: May 2006
Location: Windsor, VA
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Two questions about my new 85 123

I know there are a few problems that are common to the 123. I'm wondering if these two had been sorted out before my 85 came along.

1. Does my car have the dreaded climate control servo?
2. I know the 85 had a slightly different tranny but is it still susceptible to the B2 piston failure?

Are these things I should fix as PM? Car has 255K on it.

TIA
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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #2  
Old 11-12-2009, 09:29 AM
Chad300tdt's Avatar
SE pa BenzFest 8/19/2017
 
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Location: North Wales, PA
Posts: 4,000
The 1985 has the ACCIII not the evil servo. It has it's own problems, but I've successfully fixed 3 of them now. The problem on all three was a seized aux water pump that fried the board in the CCU. There are DIYs online that walk you through taking them apart and resoldering if it's needed.

I believe all the transmissions are capable of having the B2 failure, but most often it's just a vacuum issue or it needs a new filter and fluid.

On my CD, there was a vacuum leak in the hose to the ARV and it caused MAJOR shifting slams.
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Chad
1985 300CD - "Gladys" - 255,XXX miles - FOR SALE
2005 Dodge Magnum 3.5 SXT AWD
1998 Acura 3.0 CL
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"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

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1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
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  #3  
Old 11-12-2009, 11:31 AM
toomany MBZ's Avatar
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^ Agreed. A common failure on that CCU is/are cold solders. You'll have to pull the unit and inspect the pc board.
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  #4  
Old 11-12-2009, 04:51 PM
muleears's Avatar
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Location: Windsor, VA
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What are some other common problems to the 123? I have owned 6 Benz (three now) but never a 123. Anything major I should look out for, such as oil pump or timing chains? Vacuum pump? Etc?
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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #5  
Old 11-12-2009, 05:26 PM
Chad300tdt's Avatar
SE pa BenzFest 8/19/2017
 
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Location: North Wales, PA
Posts: 4,000
Rust is really the biggest common problem for 123's IMO. Make sure ALL the body drains are clear.

Other issues I look for are oil cooler lines, transmission cooler lines, coolant bypass tube (the 2" piece under the thermostat housing), motor mounts, air filter housing bracket and bushings, leaking primer pump, leaking turbo drain. Mostly just stuff that gets overlooked over the years and starts adding up.

If you've owned an OM617 before you already know most of the issues to look for.
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10th Annual Southeast PA Benzfest start at post #1472

Chad
1985 300CD - "Gladys" - 255,XXX miles - FOR SALE
2005 Dodge Magnum 3.5 SXT AWD
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
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  #6  
Old 11-12-2009, 05:45 PM
DeliveryValve's Avatar
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Quote:
Originally Posted by Chad300tdt View Post
Rust is really the biggest common problem for 123's IMO. Make sure ALL the body drains are clear....
X2.... Especially behind the front fender behind the door.

Growing up in the Snow Belt in the '70s and '80s, my dad used to spray the undercarriage of our cars with used motor oil or trans oil before winter set in. Our cars never rusted. Just was pretty grimy. He would later pressure washed them during the spring to get rid of the gunk.



.
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  #7  
Old 11-12-2009, 05:53 PM
muleears's Avatar
Old MB Driver
 
Join Date: May 2006
Location: Windsor, VA
Posts: 1,435
If you've owned an OM617 before you already know most of the issues to look for.[/QUOTE]

I had one many years ago but that was before I knew diesels very well. My recent cars have had 603's, a 606 and one gasser.

I pick the car up this weekend. I bought it sight-unseen, only pics and descriptions. I got a good enough price that I think I'll be OK. I expect it to need some work to bring it up to par, after all it is almost 25.
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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #8  
Old 11-12-2009, 07:06 PM
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Join Date: Sep 2004
Location: Athens, GA
Posts: 107
I have an '85 and love it! 268K miles but in above-avg shape. Just a little rust on driver's side rear wheel well. Car had a NY School of Photography sticker so it may have spent a few winters up north. I love these cars. Can't seem to keep away from them for very long.........
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1985 300 D T - Rauchsilber (Smoke Sliver Metallic) with MB Tex Quartz 155 = Cream interior - 320K and counting!

1999 E300 TD - Silver - Just got her 3-13-15 !

the 2nd '83 300SD - Brown Metallic - traded away

1985 Limo Diesel aka "Stretchy" - Sliver - Blue Int - Sold but still in Athens

1983 300SD - Brown Metallic - Sold April 2008

1982 300 D T - Royal Blue with Tan interior - Sold
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