Quote:
Originally Posted by averyphilly
When I inspected the pump, I didn't find any signs of breakage or pending breakdown. The rocker arm, spring, piston, and bearings are all intact. There were no metal shavings or shrapnel. Despite spraying the valve with lubricant, I am still not able to get it off. I did test it though, and it seems to be working well.
Any help you can offer is greatly appreciated. I have many other questions, but I will reserve those for future threads. 
Averyphilly
'85 Mercedes 300D Turbo Diesel
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There are three more check valves inside the pump. You should have checked those too. They look like watch batteries. The inside of those valves are plastic and they break. One of the three on mine had a crack and i was wasnt getting enough vacuum.