My '87 190D 2.5 Turbo has had a "surging" idle condition since I've owned it. I intend to replace the delivery valve seals, but have not purchased the seals yet. Do I simply need the O-rings, or are there copper crush washers that I will also need?

SteveM.

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner

You will need both if you decide to do the delivery valves. But if I were you I'd diagnose the surging further. A leaking delivery valve would cause a miss and rough idle, not surging. How high does the engine surge and does it happen all the time or just sometimes? Have you found any pattern?

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL