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I believe after all you have done a compression check would be next and if you find Cylinder lower the spec a leak back test to see if you can hear if compressed air is leaking past the valves or Piston/cylinder.
What type of check have you done to see your timing chain stretch. It effects your valve and fuel injection pump timing.
People have disagreed with my comment on this. Deliver Valves have 2 functions. There is a color on them to try to minimize the wave that happens inside of the Fuel Injection Hard Lines when the delivery valve shuts off the fuel and when the delivery valves close they trap fuel inside of the fuel injection hard lines.
If fuel from the fuel (hot fuel is thinner) injection hard lines leaks back past the delivery valve it causes a slightly less fuel delivery. That shows up more when say one valve is worn worse then the rese.
When I worked in a fuel injection shop I would inspect the delivery valves (both parts are mated together, don't mix them with the other valves). If you see an obvious sort of cut in the sealing surface replace it.
If it just looks a little worn (I cannot describe that) they can be lapped together but you need to keep the lapping compound away from the retraction collar I spoke of.
We did not replace delivery valve springs unless broken or the Pump rebuild kit came with new springs. Nor did I have any way to test the springs.
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84 300D, 82 Volvo 244Gl Diesel
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