Thanks Peter,

I replaced seals, o-rings and springs when I redid the work Wednesday.... I agree - replace all three, although in the past I have re-used the springs.

Karry


On 01/26/2017 5:06 PM, Peter Frederick via Mercedes wrote:
you MUST replace the copper seals, they work harden and will never seal twice.

They are cheap, but shipping will usually bite you (as in $10 for shipping and $2 for seals).

The o-rings just seal the fill chamber from leaking out, maybe 30 psi. The copper seals keep full pressure in the injection lines, if they leak you have no injection at idle (or poor injection very late). Makes the engine shake like crazy.

Also check for a leaking injection line, although they usually make a huge mess with diesel fuel leaking all over if they are bad.

A stuck injector will knock badly and give you excess vibration too.

Peter

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