Problem..Diesel engine running rough until warmed

Thanks

Could the problem be a difference in compression between cylinders?
with an assumption that the work todate is correctly done ( which also means the valve tappet clearances are set correctly ! ), leaves the valves, valve seats and injectors to test. To find which cylinder or cylinders are misfiring undo the nut on the injector fuel lines to allow fuel to escape and listen to the effect each line makes as you undo then tighten up again, you will soon find the crook cylinder. I would then swap two of the injectors around,using one good and one from a misfiring cylinder, then note the effect again when starting from cold, if the problem shifts to what was the good cylinder then that injector is the culprit, with no change then the valves need attention.
ps if one injector is crook I would still take all of them to be serviced as they need to be set up so that they all release the same amount of fuel at test.

Cheers Arthur from Tassy

Thanks for the replies. Arthur, I was checking everything like you suggested but noticed on one that it had a small leak. Fixed that and it sounded better. Chris, I"m going to get some cleaner as you suggested and see if that helps before having them serviced, since they were working fine before the engine rebuild. Also, Chris, your description of the sound as being a knock is exactly what it sounds like.

I"ll work on it a bit and post back with either more questions or the "fix" - hope it"s the latter!

Thanks again...

Mike