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  #1  
Old 05-29-2003, 02:37 PM
Chris Blanchard's Avatar
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Join Date: Dec 1999
Location: Cincinnati, OH
Posts: 221
W124 300D 2.5 Turbo Breather Hose Issue

FYI:

When I removed the valve cover on my recently acquried 92 300D 2.5 Turbo (W124.128), I accidentally broke the breather hose that runs from the top of the valve cover to the main air intake hose that feeds the turbo. The hose ends were brittle from age and heat exposure and they snapped right off

I went to the dealer to get another one and we had a very difficult time finding the right part in the EPC. The one that the EPC listed does _not_ look anything like what was on my car.

I searched the various MB parts sites on the web and found that each of them also listed the wrong part (accompanied by the same picture that the dealer had). I know most if not all of these parts houses use the same parts database software so I was not surprised that the mistake was widespread.

Fortunately, the broken part had a part number on it and we were able to order the right part.

Here are the _correct_ MB part numbers for the breather hose pieces on an OM602.962 engine:

601-016-01-63 is the grommet that is mounted in the top of the valve cover. The one on my car was hard as a rock, the new one is a soft pliable rubber.

601-016-01-23 is the 90 degree fitting that runs from the breather hose itself and inserts into the grommet.

I did not have to replace the actual hose (and/or the insulation that covers it) so I do not know the part number for that. I was able to remove the broken pieces from the end of the hose and re-use it. It is not obvious that the breather hose has a detachable 90 degree fitting, and that the fitting is not integral to the hose itself.

Total for these two parts was just shy of US$5.00.

I hope this post saves someone a bunch of grief. When I got the part from the dealer, we looked up the p/n for the 90 degree fitting (the EPC does list the grommet correctly) and it was not listed for the W124.128 at all. I suppose it's originally from the 4-cyl variant of the 602, the 601 (hence the part number!).

Chris Blanchard
1992 300D 2.5 Turbo 147k
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  #2  
Old 05-29-2003, 03:04 PM
HDenDiesel's Avatar
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Location: Quebec, Canada
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Thanks for that info. I keep a note of the parts number...
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W124 300D 2.5 Turbo Breather Hose Issue-hose.jpg  
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W126 1985 300SD TurboDiesel
W164 2009 ML320 BlueTEC (Sold)
W123 1983 240D Stick (Sold)
W210 1998 E300D TurboDiesel (sold)
W124 1993 300D 2.5 Turbo (sold)
2012 GMC 2500 Duramax PickUp
2015 Ram 1500 EcoDiesel PickUp
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  #3  
Old 06-04-2003, 12:07 AM
archibald2's Avatar
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Join Date: Jan 2003
Location: Houston, Texas
Posts: 59
Thumbs up Sharing your information

Chris,

thank-you for passing along the description and part numbers involved. I will scrutinize the condition on my '93 2.5 Turbo after reading your contribution.
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'82 300D Turbo 204K
'10 Toyota Prius 85K
'13 AMG C63 (P30) 23K
'14 Audi Q5 TDI 46K
'16 RAM 2500 CTD 12K

'10 VW Jetta TDI 65K (traded)
'12 Nissan Leaf 34K (returned end of lease)
'15 Audi A6 TDI 25K (traded)
'95 E320 166K (traded)
'93 300D 2.5 Turbo 168K (sold)
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  #4  
Old 06-04-2003, 07:58 AM
Chris Blanchard's Avatar
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Join Date: Dec 1999
Location: Cincinnati, OH
Posts: 221
I wasn't having a problem with the breather hose, it just cracked when I pulled the valve cover to measure the timing chain stretch.

Chris
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  #5  
Old 06-04-2003, 03:44 PM
HDenDiesel's Avatar
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Join Date: Oct 2002
Location: Quebec, Canada
Posts: 43
What is the procedure to measure the timing chain stretch and is there special tools required?
Thanks,
__________________
W126 1985 300SD TurboDiesel
W164 2009 ML320 BlueTEC (Sold)
W123 1983 240D Stick (Sold)
W210 1998 E300D TurboDiesel (sold)
W124 1993 300D 2.5 Turbo (sold)
2012 GMC 2500 Duramax PickUp
2015 Ram 1500 EcoDiesel PickUp
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  #6  
Old 06-04-2003, 06:47 PM
sixto's Avatar
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Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,656
The proper method calls for checking valve lift with a dial gauge. You can eyeball it by lining up the cam mark with the cam bearin tower mark and reading the difference between 0-degrees on the crank pulley and the TDC mark next to the pulley on the timing chain cover. <5 degress ~ leave it alone, >5 degrees ~ keep an eye on it or change it now if it's the original chain in a 300D 2.5. Might only be certain years of the 300D 2.5 that has iffy chains.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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