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#1
08-31-2011, 10:18 AM
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m103 cam wear on 300sel
I just had the rockers and cam checked(loud clicking noise) and discovered the cam and rockers were worn well beyond tolerances. Being replaced today.
My question is... what could have caused this? The front two cylinders were the worst, gradually better towards the rear...the last one being perfect. Is there something else that should be done as well? Thanks Warren 
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#2
08-31-2011, 10:41 AM
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It's a common thing for the early style cams. Due to angle of engine, cam gets more oil towards the back.
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#3
08-31-2011, 10:51 AM
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That would make sense....Thanks
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#5
08-31-2011, 11:05 AM
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I have a great MB mechanic that has yrs of experience. I got lucky. New parts cost prohibitive... he found a great set from "used" yard...fairly inexpensive, but do not know if they are the 90 and above upgrade. Do not have final bill yet. He is doing the oil seals as well, since cam is off. I am hoping this helps with smogging in california.
He also told me it helps with catalytic converter also...no oil passing seals to get in exhaust, so cat purges itself(oil is bad on cats!).... Let's see...I will post results Warren
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#6
08-31-2011, 03:20 PM
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Remember that the later style cam is NOT compatible with the rockers. You will need to replace everything as a set.
Without getting into a typical oil discussion -- use diesel-grade such as Rotella-T 15-40 to avoid future wear.
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#7
08-31-2011, 06:02 PM
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I read of issues on compatibility Thanks... I use Delo 15-40.....Just want it to hummmm.
like it used to Warren
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#8
09-01-2011, 08:40 AM
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Got the SEL back last night...runs so smooth! Cannot believe the performance now. With the great body, paint ,perfect interior...It is like a new car! I am so stoked about these older Mercedes...always have been...always will
Warren
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#9
09-01-2011, 08:47 AM
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I read some where on that engine the fix is to drill oil holes on the oil rail larger.Ford Pinto's had this problem too.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran
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#10
09-01-2011, 12:31 PM
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well, here is the bill. Since I have done most past work, I am not familiar with prices. Let me know what you guys think...........
used cam and rockers...250.00 valve stem seal kit.......50.00 other parts..................71,00 Labor.........................380.00 Car runs great I know it was done properly......Priceless!!! Warren
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#11
09-02-2011, 11:28 PM
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Last time I smogged this car I was near limits and was told car would probably fail next time...After cam,rockers, and valve seal kit installed... numbers were equal to new car! I think it was the seals that did the trick...
Just saying...
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