I've always had my indie replace delivery valve seals (the two times I've had to have it done). Thinking about trying it myself on the 87 300TD I just acquired...indie even offered to lend me the tool I'd need.

I see a nice DIY for the 606:

http://www.peachparts.com/Wikka/OM606DeliveryValveSeals

I imagine 603 would be similar. However, when I read various threads, it seems that, as often as not, this is a job where people run into trouble, mess things up. So I'm tempted to play it safe and just have the indie do it.

I'd be glad to benefit from what any others have learned from experience. Thanks.

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife