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  #1  
Old 09-21-2009, 09:04 AM
slowski
 
Join Date: Oct 2003
Location: Baltimore / DC
Posts: 45
'97 W210 Delivery Valve Seal Replacement

I pulled it off this weekend, replaced delivery valve seals and all fuel hose o-rings. Before I embarked on this repair, I read all the threads on crossover and IM removal, and the Parrot’s excellent DV pictorial. I rehearsed this in my sleep. Piece of cake, duck soup. Well,... Needless to say, I have several tips for first timers, and maybe one or two even for old timers. First, pro’s and con’s of parking down hill. Pro: not much cranking to do after the repair to get fuel to injectors. Con: every hose you pop off, even the delivery valves, fuel just keeps coming. A large tub placed under the engine caught altogether over a gallon, and I worked fast. Used the fuel to clean the intake, which was another story. Still can’t figure out how the engine could have breathed with some passages almost completely clogged by crud. My chimney cleaning after 10 years was easier than the IM. DV tip: place rags around the IP to catch springs and crush washers, especially during reinstallation. What worked the best was to stand the spring on top of the DV with forceps, placing a dab of vaseline on the crush washer and installing it in the top, then carefully placing the top over the spring, finally wiggling everything to center. Tripple torqueing... Long story short, no leaks whatsoever. But,..
Couple of scary moments. Took only 2-3 times cranking to get it to fire. Idled for 10-20 seconds, then started to violently shake and nail. Though I was screwed!. I thought nailing was the faint metallic sound when you put your ear to the valve cover with the oil filler cap removed. It’s more like pounding on the valve cover with a hammer, I really though I dropped some bolts into the intake ports when cleaning them or before installing the IM. My heart and head was pounding louder than the engine. I shut it off, preventively drank 12 oz. of Yeungling, took the kids for a bike ride, and didn’t tell my wife. Couple of hours later, I started it, idled fine, took it for a drive. 500 feet from the house, lost power, nailing, running on no more than one cylinder, check engine light, you name it. Nursed it home, parked it uphill. Looked under the car, diesel dripping everywhere. Went to grill dinner. Didn’t sleep well at all...
Next morning, started it, idled fine, slowly ran it up and down the neighborhood, then went a mile from the house, then 2 miles, then 30 miles, ran great, stopped dripping. Correct me if I’m wrong, all the running problems were just working the air out of the system, and IP and DV’s getting settled. The fuel dripping must have been just the residual spills, working their way off the suspension and frame. Now the top of the IP is dry, no drops hanging on fuel lines, and the engine runs great, seems a hair louder, but that may be just an impression. The check engine light was an EGR malfuncion that did not come back after clearing (and cleaning). All is well, but it was not smooth for a first timer. 92K miles. By the way, the GP’s came out very easily, and required just a light cleaning with emory cloth. I can't even estimate what this would have cost to have done at a dealer.

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  #2  
Old 09-21-2009, 09:24 AM
Registered User
 
Join Date: Dec 2004
Location: Nashua, NH
Posts: 3,956
Yes, I would fully expect roughness and misfiring during the initial running after breaking open the fuel system the way you did - I would not worry about that too much. I have had similar issues during filter replacements even when I was careful to fill the filter up with fuel.

If it is not leaking now and running well it sounds like your mission was accomplished! Congrats
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2013 C300 4Matic
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Old 09-21-2009, 09:48 AM
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Join Date: Feb 2007
Location: VA
Posts: 621
Sounds like success, well done. For the intake cleaning, taking it to a machine shop to get hot tanked is money well spent. It'll come back clean enough to eat off of, with no effort or mess on your part.
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  #4  
Old 09-21-2009, 09:40 PM
Gene
 
Join Date: Mar 2007
Location: Buffalo NY
Posts: 1,102
My 95 606 had a metallic tap like that near all the time when cold, on D2. Now I know it must have been a IP issue. Was greatly reduced on B100, and ours is "thick", made from chicken wing fryers.

Anyway, good show! My new 97 will need a Viton retrofit soon. Yet, I'm leaving the DV seals until I see some wetness on the top of the pump.
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  #5  
Old 09-22-2009, 07:21 AM
slowski
 
Join Date: Oct 2003
Location: Baltimore / DC
Posts: 45
Gene, you're right, leave it alone untill it's visibly soaked on top of the IP, unless you got nothing better to do. My DV's were leaking to the tune of one drop every 2 seconds. If you are removing the IM though for GP's, by all means do the DV's and fuel lines as maintenance. Actually, removing the IM should be routine maintenance. And Lupin, next time around I'm taking your advice and getting the IM hot tanked. What a mess, it was a most unpleasant couple of hours spent. What about when I'm cleaning my grill at the end of the season with a pressure washer. Shouldn't hurt the IM with all flaps removed. I need some bioengineered, carbon sludge eating wooly grubs. Hey, do pond goldfish like carbon?

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