Did you ever look at prime pump? May be this nailing sound is coming because the fuel flow is not enough. Just a thought. It came to me after added 2 stroke oil, a "thicker" diesel is creating better flow to pump and fuel nozzles.
Now why is I'm thinking, because before I added 2 cycle oil, my would like fluctuating at stop light, like skipping one cylinder. I know for sure my nozzles are at right pressure, since I change all previously installed spacers, they were all not enough to get right pressure at nozzle.
It's little expensive part , prime pump . But this pump is working all the time, even start up, right ?
I got springs from Pelican and will get kit from Mercedes source.
Quote:
Originally Posted by Diseasel300
On the M pump that the SDL uses, the delivery valves come right out once you take the holder off with the special spline tool. Unlike the MW pump that the 617's use, the Delivery Valves have no bearing on how the engine runs since you are not disturbing the pumping elements.
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