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  #1  
Old 11-07-2013, 07:55 PM
Jeremy5848's Avatar
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Location: Sonoma Wine Country
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1995 E300D Monovalve Problem

I need to hear from all on this list or their friends whose '95 E300 diesel or very late production (~May 1993) 300D2.5 had a cracked/leaky monovalve (001 830 40 84). I need the VIN of the car that had the problem.

Having replaced my leaky monovalve three times with no success, today (11-07-2013) I met with the service manager and zone rep for Mercedes-Benz of Santa Rosa (California). Nice meeting, both were professional and understanding, agreeing that there must have been something wrong with the plastic when the monovalve/pump for the '95 E300 was made. Both agreed that telling customers to buy a $20 "radiator repair" kit at Cheapie Joe's Auto Parts was not an option. (That's what I finally did to fix my leak.)

"What to do" was the big question. They finally decided that the service manager would file a "PTSS Report" (PTSS = Product Technical Support System) with Mercedes-Benz of North America for forwarding to Germany. I was told that such a report cannot be ignored, that a response is required. Two caveats: (1) it might take "some time" and (2) if I can come up with a list of others who have had this problem, showing that it isn't a me-only problem, the PTSS stands a much better chance of getting action.

If you or anyone you know has had this problem with this monovalve, please let me know ASAP. If you don't want to post the VIN, please send me a PM or email.

jeremy [at] cds1 [dot] net



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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #2  
Old 11-14-2013, 03:32 PM
Jeremy5848's Avatar
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Now we are four

Update: The list of car with cracked monovalves has grown to four:

Chris (Ohio)
Jane (California)
Jeremy (California)
Zulfiqar (Texas)

I am waiting to hear back from Zulfiqar; once I have the VIN of his car I can go to the dealer's service manager who will then file the report. Having this problem on multiple cars all over the country will make it harder (but not impossible!) for Mercedes to ignore.

Anyone else?

Jeremy
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #3  
Old 11-14-2013, 04:37 PM
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I'll check mine. I haven't noticed any coolant loss. Possibly only a problem with high-mileage cars?

As I'm fond of posting, my car is only 50k.
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  #4  
Old 11-14-2013, 05:59 PM
Jeremy5848's Avatar
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High mileage indeed!

Quote:
Originally Posted by andrewjtx View Post
I'll check mine. I haven't noticed any coolant loss. Possibly only a problem with high-mileage cars?

As I'm fond of posting, my car is only 50k.
You are fortunate to have a "nearly new" Mercedes. As to what causes the crack/leak problem, the answer so far is "we don't know." My personal suspicion is that whoever supplied the plastic to Bosch got the formula wrong on some of them. Most monovalves don't have this problem, especially cars that still have the original monovalve. Maybe Bosch moved the production line to China?

Jeremy
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #5  
Old 11-16-2013, 01:28 PM
Jeremy5848's Avatar
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Location: Sonoma Wine Country
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PTSS Report

I now have five owners including myself with this same problem. The list went to the service manager at my dealer by email yesterday. He will file a PTSS Report with MBNA. Whether it will do any good is another question but at least I'll have the satisfaction of being dissed at a higher level.

1995 E300D owners with cracked/leaking monovalves
  • 'Connerm' WDBEB31E6SC0828XX (Virginia) Monovalve replaced in 2008 and has not failed. "It was not cheap."
  • Jane WDBEB31E4SC1396XX (California) Monovalve is cracked but not yet leaking.
  • Chris WDBEB31E6SC1519XX (Ohio) Monovalve replaced twice; one replacement was purchased during a vacation trip to Germany. Owner eventually repaired the leak with glue.
  • 'Zulfiqar' WDBEB31E6SC1899XX (Texas) This monovalve actually broke off at the point where others have had only a leak. The owner performed a glue repair and the monovalve is working although it still leaks a small amount.
  • Jeremy WDBEB31E1SC2227XX (California) Monovalve replaced three times (twice by owner using new parts from The Classic Center in Irvine, Cal. and once by my local dealer), all unsuccessful. The original part was subsequently successfully repaired with a "radiator repair kit" purchased (US$20) from a local auto parts store and installed on the vehicle (July 2013). As of this date (November 2013) the repair is holding (no leaks).[/FONT]

Jeremy
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #6  
Old 12-03-2013, 12:39 AM
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The list grows . . .

The list has grown to six current owners with the cracked monovalve problem:

‘Connerm’ PeachParts MercedesShop Forum member in northern Virginia.

VIN WDBEB31E6SC0828XX.


Jane, Monte Rio, California, who is a personal friend of mine and whose car has been serviced at Mercedes-Benz of Santa Rosa. The monovalve in her car is cracked but is not yet leaking.

VIN: WDBEB31E4SC1396XX.


Chris, Oberlin, Ohio. Has had the car since September 2011 and has had two cracked monovalves. First was on the car when he bought it; second was purchased as a replacement while visiting in Germany in 2011.

VIN: WDBEB31E6SC1519XX.


Michael, Lynnwood, Washington. His monovalve, like mine, has been replaced three times. The first two were by an independent mechanic who sourced the part from MB of Lynnwood. The third part was installed by MB of Lynnwood and it is now cracked and leaking. The picture Michael emailed me looks just like mine -- cracked in the same identical place.

VIN: WDBEB31EXSC1771XX.


‘Zulfiqar’ PeachParts MercedesShop Forum member in Texas.

VIN: WDBEB31E6SC1899XX.


Jeremy, Santa Rosa, California. Owned since March 2012. Has had four (4) cracked and leaking monovalves: the one in the car when purchased, two new ones from the Classic Center, and one installed by Mercedes-Benz of Santa Rosa (California).

VIN: WDBEB31E1SC2227XX.
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #7  
Old 12-03-2013, 01:23 AM
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no leaking on my '99 turbodiesel

My '99 E300D may have been in this category but the PO has vanished. He was a Forum member for a while and that's how I found the car. He stopped posting on the forum after he sold his 240D/123 so not going to find out the history on this issue. I don't recall him telling me that had to be replaced either, I surely would have remembered it because my W140 car (now gone to a parts heaven) had a monovalve replaced and the PO told me it cost him something like $520 (its easily three times more complicated than the W210 valve!).

The reason I wonder about the valve may have been replaced is because along with the vehicle came a trunk full of parts he accumulated during the several years he owned the car (the car was sold out of Sacramento, a one owner car until Anghrist bought it and used it 6.5 years).
Anyhow, in the trunk was a monovalve, brand new still in the MB box.
I just pulled the stuff out of storage to see what was there but it specs out to be for an E430 gasser. It doesn't even resemble a diesel valve. I suspect he bought it by mistake or was told it would fit his car then found it wouldn't.

So, no smoking gun on my part to report and thus far no coolant leaking from my valve but if there is, you'll be the next to know!
DDH
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  #8  
Old 05-30-2014, 03:05 PM
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+1
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  #9  
Old 02-11-2016, 11:50 AM
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They made it right!

To follow up to the earlier posts, Mercedes has reimbursed me for the $500 I spent (back in January 2013!) on the first (of three) replacement monovalves (all of which cracked and leaked). This reimbursement happened when the local service manager, Nick Stauer, of Mercedes-Benz Santa Rosa (California), spoke to the new factory rep for our area. She agreed to put in a request for a "reimbursement for leaking monovalve" (their words) and it was honored. I got the check yesterday.

This was on top of replacing the monovalve once themselves at no cost to me. Their replacement lasted less than a month but it confirmed I wasn't doing anything wrong when I did the work. Their actions are definitely above and beyond what one expects from car dealerships. I am pleased. All hail Nick Stauer and Mercedez-Benz of Santa Rosa (aka Smothers European).

That it took three years is unfortunate (better for them if I had sold the car or died or moved away). Once I had patched the original monovalve (stopping the leak) the pressure was off and I didn't push as hard as I might have.

It also suggests that the factory has no intention of getting their subcontractor to build a new, non-cracking part. This I expected from the beginning; why go to a lot of work to re-design a one-off component used in 3,000 cars 20 years ago? BTW, a new monovalve/pump (001-830-40-84) is now $900 or so I've been told. Caveat emptor!

Also see:

Anyone have a cracked monovalve in either 300D-2.5 or E300D? (W124)
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #10  
Old 06-30-2017, 09:26 PM
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This one less than a week old and already leaking.




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  #11  
Old 07-01-2017, 12:10 PM
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Quote:
Originally Posted by dieseldiehard View Post
My '99 E300D may have been in this category
I thought all the w210 diesels used a duo-valve; two valves with two inlets and two outlets? Not saying it isn't susceptible necessarily, but it's clearly a different part. Also the plastic used in the w210 diesel duo-valve is black, while the defective one pictured here is brown. Appears to be a different plastic and/or different manufacturer.
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  #12  
Old 07-01-2017, 12:46 PM
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95 is W124
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  #13  
Old 07-02-2017, 01:13 AM
#TRUMP2020
 
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Quote:
Originally Posted by dieseldiehard View Post
I just pulled the stuff out of storage to see what was there but it specs out to be for an E430 gasser. It doesn't even resemble a diesel valve. I suspect he bought it by mistake or was told it would fit his car then found it wouldn't.
'99 E300 has the same p/n duo-valve as an E420. But the E430 is different, who knows why, so yeah it sounds like it bought the wrong one by mistake.

Quote:
Originally Posted by shertex View Post
95 is W124
'99 e300 is a w210, which is what dieseldiehard was asking about.
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  #14  
Old 07-04-2017, 09:12 PM
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1995 E300D Monovalve Problem

Have to ask the folks that have encountered and ran through this issue.

Do the new valves break off at the elbow or would you guys think that it would be ok to keep driving and carefully maintaining the coolant level until I sort out a replacement through the parts warranty?

The car overall gets about 5000 miles or less per year. I believe and think that I may be able to sort out a replacement and find the time to change it out of the car in about two weeks more or less?

As always your expertise and advise is always appreciated.

One think that has always intrigued me is the following. Would you guys think that they leak in between the cold side and the hot side of the valve itself as it leaks towards the outside as well?


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  #15  
Old 07-05-2017, 10:33 AM
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If you leave the climate control setting to max cool, which should keep that valve closed, a catastrophic failure is unlikely. If you use the heat, and the leak increases, loss of coolant could destroy the engine.

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