My 73 220d motor that I just swapped in to my 69 220d started and ran after the install. It started probably 5 different times, I drive it three times. It may have taken a smidge more cranking that I'd like, but not excessive. Otherwise it ran just fine. Then I decided to change the fuel filter. When I put the new filter in I was gonna run it on diesel purge, just for good measure. I replaced the filter and connected the fuel system to a gatorade bottle of diesel purge, the bled the system (fuel at all 4 injector nuts). Now she won't start. She kinda maybe tries on one cylinder, but that's all. So I thought well maybe this diesel purge stuff doesn't light off as well as regular diesel, so I drained and replaced it with regular diesel, reprimed, still no starting. Last night I got a friend to help and we tried starting it on wd40, the engine didn't even seem to notice it.

So I really don't understand. Since the wd40 didn't work that makes it sound like a compression issue, but absolutely nothing but the fuel changed, so I'm loath to believe that. I could take a crack at adjusting the valves, etc. I just don't like the idea of messing with things that were working. Any thoughts?

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1969 220d - soon to be a reliable daily, and so the tinder profile can say I drive a Mercedes