27. Originally had SB8, replaced with YSB12 after some cabin
modification. YSB12 seller said engine
ran. Became suspicious of sellers claim months later upon discovering there was no injector nozzle.
Pulled and cleaned the high pressure fuel pump
. Clean injector and reassembled complete injector from both the SB8 and YSB12 parts
. Injector 'chirps' when pumping fuel
(I think this is normal, it's likely the sound of the check ball acting against the spring as the plunger pushes the fuel
to the injector). Injector (after reassembling out of the two) 'pops' at about the same time the pump
chirps. With the injector out of the head
it seems to make an 'okay' spray pattern. It doesn't seem very atomized, but I'm not sure how atomized diesel
spray from an injector is supposed to look. I pulled the starter and checked the injection timing, it appears to be almost exactly at 10 degrees before TDC. I pulled the valve cover and checked the valve lash, and it appears to be correct (about 0.2mm).
It won't start...and doesn't really seem to be 'close' either. When I use the starter with the throttle open I get white smoke from the exhaust
. Using WD-40 to assist, I get more white smoke. Never does it seem like it is about to catch. When I use a blow dryer and WD-40 I get even more white smoke, but again it doesn't even seem close to catching. I have tried running the starter with the compression
release level open for a few turns and then allowing it to close and still only get smoke.
When hand cranking, I cannot turn the crank all the way through the compression
stroke quickly without the compression release engaged. Thus, I feel like I have pretty good compression, though I haven't measured it.
I also have bled the fuel system (actually quite a few times). Because I've pulled the injector out and hand cranked it for quite a while, I'm pretty confident there are no air bubbles in the fuel line. There are no noticeable fuel leaks
It also had old fuel when I started. Figuring it was the fuel, I used the lift pump
to take all of the old fuel. I replaced it with 5 gallons of fresh fuel before doing any of the above tests.
So, short of pulling the head
and working the valves, I'm running out of ideas. Thoughts?