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  #1  
Old 02-14-2011, 05:32 AM
2.5Turbo's Avatar
602 648 113 A630
 
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Delivery valve seals leaking...again? 1990 300D 2.5 Turbo

About 500 miles ago I replaced my badly leaking delivery valve seals on the '90 300D. The section of the old gaskets was pretty much square so they were done. I installed five new gaskets and five new crush washers making sure to keep everything as clean as possible. Everything that came out went straight into a cup of clean diesel. I observed the 30NM, release, 30NM, release, then 30+5NM torque procedure when reinstalling the valve holders.

Then the other day I smell fuel again, and it's coming from the top of the pump. What did I miss? Or did I just get some bad seals? As far as I know they aren't OE seals (they came from ********).

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz


Pre-glow - A moment of silence in honor of Rudolph Diesel
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Old 02-14-2011, 06:58 AM
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Did you lube the o rings when you put them on? Sometimes they can get damaged when you put them on.
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Old 02-14-2011, 11:11 AM
92 300D 2.5L OBK #59
 
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Are you able to tell which injector is leaking? Base or top of the delivery valve? When you say gasket you talking the o-ring correct?
Pictures/instructions: http://www.peachparts.com/Wikka/OM606DeliveryValveSeals

If its from the top of the delivery valve you'll just need to snug up the injector line. Otherwise you'll need to redo the delivery valve. I ordered extra O-rings and crush washers when I did mine (Just in case). I'd try snugging down the leaking delivery valve before I redid it. YMMV.
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Old 02-14-2011, 12:08 PM
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Same problem here.

You need to be very meticulous about removing any twists in the o-ring once it is on the DV holder. It is very hard to tell if the rubber is twisted, but since each one goes on so tight, you can assume each one is twisted.

You must lube them before rolling on, then use a fine tool to pull the o-ring out of the groove and around drag it around the entire perimeter.

Kinda like when you roll on a pair of tight socks.
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Last edited by jt20; 02-14-2011 at 12:19 PM.
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Old 02-15-2011, 12:46 AM
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602 648 113 A630
 
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The fuel is coming from the same place it was before, at the base of the valve holder up from under the hold down collars. I didn't lube them with oil but they were somewhat wet with diesel when they went on. Should I have used oil?

Quote:
Originally Posted by jt20 View Post
Same problem here.

You need to be very meticulous about removing any twists in the o-ring once it is on the DV holder. It is very hard to tell if the rubber is twisted, but since each one goes on so tight, you can assume each one is twisted.

You must lube them before rolling on, then use a fine tool to pull the o-ring out of the groove and around drag it around the entire perimeter.

Kinda like when you roll on a pair of tight socks.
That's probably what did it...I didn't pay much attention to making sure they weren't twisted when they went on. At least it isn't a bank breaking part
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Dale

http://i52.photobucket.com/albums/g1...MG_2277sig.jpg

1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz


Pre-glow - A moment of silence in honor of Rudolph Diesel
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  #6  
Old 02-15-2011, 01:42 AM
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Thanks, JT20. That's a timely bit of advice in my slow-motion quest to get the delivery valves sealed and back on the road.

Kurt

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- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride!
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