I am putting the 951 DI together. I tested the oil system check valves and all were leaking. 2 of them held no pressure and air free flowed in both directions. Valves were easily removable with my Vice-Grips and my homemade knocker. Grab the valve firmly but not excessively and a few gentle knocks and they came right out reusable if needed. I was able to get all of them working but only ONE to my satisfaction. I replaced the other TWO with new valves. A little loctite 609 and a slight tap and they went right in place.
I made this video of what I was doing to test them. I was able to flush them with KROIL and Lectra-Clean and blow them out with shop air to try and clear them of any debris. I cut one open to see how it worked. The spring was in good shape I guess the seat gets damaged over the years.
I may have gone a little overboard in replacing these but better safer for me. They were leaking down to zero after a 10 seconds or so but were popping at around 2psi the same pressure the new ones were popping. I don't know for sure that the oil being sent in at 2psi is atomizing but I think it would be and thus helping to disperse the oil more evenly inside the engine. My goal is to have no premature failures.
YMMV
I made this video of what I was doing to test them. I was able to flush them with KROIL and Lectra-Clean and blow them out with shop air to try and clear them of any debris. I cut one open to see how it worked. The spring was in good shape I guess the seat gets damaged over the years.
I may have gone a little overboard in replacing these but better safer for me. They were leaking down to zero after a 10 seconds or so but were popping at around 2psi the same pressure the new ones were popping. I don't know for sure that the oil being sent in at 2psi is atomizing but I think it would be and thus helping to disperse the oil more evenly inside the engine. My goal is to have no premature failures.
YMMV
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