You'll never guess what I found..
Sheared plunger barrel guide pin. Effectively allowing plunger barrel to spin shutting down one cylinder. Man that took a while to figure out.
Ok update on this problem:
1. Turned fuel up to make sure motor wasn't starving
2 did valve adjustment. Valves were not too bad. #1 valve was very loose. Put it in spec.
3. Took apart injection pump to verify there wasn't a broken plunger spring or something else getting hung up...
runs perfectly at idle, also when boat is out of water not under load it revs right up perfectly. Will crack injector lines to determine if one isn't fueling right
Hello. Have a d722 that is running weird under load. White smoke, motor shakes, then dies. New fuel, fuel filter, lift pump good. Here is a video of motor running if you have any thoughts:
Motor running bad video link