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Old 07-15-2017, 11:41 AM
carl177's Avatar
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Join Date: Jun 2013
Location: Florida
Posts: 117
1995 E300D Monovalve Problem

Thanks Maxbumpo,

It lasted an extra week without any visible further breakage and I did not loose much water. Put in the warranty replacement yesterday - let's see how long it goes

Unfortunately due to picking labels from the warehouse on the box I was not able to see a production date.

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Old 07-15-2017, 03:41 PM
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Join Date: Sep 2009
Location: Oberlin, OH
Posts: 641
You can replace with older and cheaper valve from older w124 diesel (om603). Then just loop coolant to other side of engine.

This valve was probably used to reduce engine temperature fluctuations and therefore reduce emmisions. It is not necessary on 20 year old car.
-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991
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Old 11-17-2017, 01:30 AM
Vice President of Snark
Join Date: Nov 2009
Location: Austin, TX
Posts: 1,230
Chris, do you have any pictures of what the retrofit to the older monovalve would look like on the OM606? I've got hot air out the side vents now and I'm assuming its the monovalve. Probably need to take it apart this weekend.


'85 300TD "Puff The Magic Wagon" - Rolling Resto
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter
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