I'd be very careful here. While the injector is no doubt the problem, we don't know if the hydrolic lock that has already happened caused any problems. You don't want to cause any more damage by installing new injectors and lighting her up only to find you had a bent rod that's now tearing up something else.
This engine should really be looked at by somebody knowlegeable (if you aren't) I would at least turn it over by hand with the plugs out and see if anything is hitting anything else. I would also measure TDC height on the one with the problem and compare it to a good cylinder.
While I haven't experienced it on these engines, I've seen Benz engines that have hydrolocked and caused a minor bend in the rod, only to cause more serious damage later on, and it doesn't take long!
Take it slow...
Hans
