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#1
11-10-2006, 08:07 AM
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Observation - Mahle Fuel Filter
I have been buying parts and maintenance items for my newly acquired 300SD. I managed to order Mahle main fuel filters from two different vendors.
One of the vendors supplied the filters with a new O-ring taped to the top of each box. The other supplied no O-ring. I took a quick look last night in the FSM and it does show an O-ring in the filter assembly, on the filter mounting bolt. Do you guys change this O-ring with every filter? Once in a blue moon? There is some diesel on the bottom of the currently installed filter...I wonder if it is coming from an old, worn out O-ring? Is that the common source of diesel leaks at the main filter housing? tia, Tim
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2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) 
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#2
11-10-2006, 08:13 AM
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All filters I have bought have included the O-ring, I put on a new O-ring with each new filter. Congratulations on getting your 3000SD you are now hooked. Good luck and God bless you and your new car.
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#3
11-10-2006, 08:55 AM
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I had to get the internal rubber O ring from the dealer. And the other copper O ring on the bolt had to come from the dealer. I found the housing scared at the top bolt from someone having an aluminum washer installed inststead of copper. I have a small leak there. I just work the bolt, loosening and retighten. I haven't found any washers with the filters yet, but I'll look from now on. Those washers were about $10 at the stealership.
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1984 280SEL, 62,000 miles Euro model in the USA 1983 300D (Totaled out 10/2004)  New Factory Mint Green paint Palomino int 1982 240D (Steak dinner for two) 
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#4
11-10-2006, 10:08 PM
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Thanks for the replies. I pulled the filter off and as I suspected, there was no O-ring on the bolt.
That explains the diesel soaked hood pad  Glad it wasn't something serious...but that pad had taken a beating. The diesel is about to dissolve it. I'll have to try to soak some paper towels to dry it out. Rubbing is a no-no. Pad comes apart 
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2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss)
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#5
11-10-2006, 10:19 PM
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Depends on the bolt you have, early versions used copper crush washers.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#6
11-11-2006, 03:06 PM
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I think all versions had at least one o-ring. The later version had 2 different sized o-rings.
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Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE
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#7
11-11-2006, 05:28 PM
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Nope my early 82 uses all crush washers. If my memory serves me there are like 3-5 versions, ask your local dealer.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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