Just got the 98 E300 back from my mechanic who replaced the delivery valves seals. One thing that struck me as odd on the invoice is that, while I was charged for the o-rings, I was not charged for the crush washers. It's been my understanding that those ought to be replaced as well.

On the chance that he didn't replace the crush washers, is that a big deal? I guess I'd know soon enough if there's any leaking.

Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

You'll find out soon enough. If you start nailing or having a rough idle, they probably didn't replace the washers.

Technically you're supposed to replace the O-rings, copper washers, AND springs when renewing the DV seals.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

For copper washers in general, they can be reused at least once.

When you fire it up, you will know right away. If it sounds like it did before you had the job done, then all well in good. Mine sounded terrible after I reused the crush washers. Did the job again using new seals and crush washers, and it back to being as quiet as a mouse.

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96 E300d

Everything sounds perfect, so I guess I'm in good shape. I'll ask my mechanic out of curiosity next time I talk to him.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I've reused copper and aluminum washers on the banjo bolts more than once successfully. I first anneal them with a propane torch, then sand out the ridges with a fine diamond hone... inspect with a magnifier to make sure it is flat and smooth. Works every time.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Who knows, maybe the mech. did replace those washers and just didn't charge for them as a line item on your invoice. Cost on those things is minimal.

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- Greg -
1973 220D, The Prodigal Benz
1974 240D

But what made me notice is that he did charge me 90 cents for the o-rings.

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Maybe the o-rings have a part number while he grabs a handful of washers from the supplies shelf.

Funola, is the that cost effective?

Sixto
83 300SD
98 E320 wagon

Yes, when you do not have any on hand and must get the job done. Takes me a few minutes to do one, probably less time than turning on the puter, order the part and pay for it online. Same for the crushed heat shields on injectors. I un-crush them when I do not have any on hand.

__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

You must use new copper crush rings (versus old) when you torque the delivery valve seals.

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Jim

I've done the same thing with the banjo bolt washers. They're only holding 30PSI or so at most, so no big deal. Not sure I'd trust that on the DV washers, where the pressure they're holding back is a few thousand pounds and the total quantity of fuel delivered is a drop or fraction thereof at idle. Any scoring or misshaping at all and you have an internal leak big enough to cause detectable problems.

With the DV copper washers, either let the pump leak until you have the parts in hand to do it, or if it's bad enough install new O-rings and go back in and replace the washers later. For a couple bucks in parts and the PITA it is to get in the DV holders it's ridiculous not to replace them "while you're in there".

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

I am not advocating re-using delivery valve copper washers. I was replying to

"Originally Posted by 97 SL320 View Post
For copper washers in general, they can be reused at least once."

and my experience re-using Banjo washers and injector heat shields, both done successfully.

I have not tried re-using delivery valve copper washers, have not had to touch them yet. When I do, I will have a new set of washers on hand but will try to re-use at least one of the old washers and see if the techniques I use works. Unless it is sensitive to thickness of the washer, which will be be slightly thinner after honing with a diamond hone, I don't see any reason why it would not work.

__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked