560 Diesel noise

Recently did a full rebuild on a D282 and it ran great for about 15 hours. I brought it out of storage this week and fired it up after not being run for about 1 month. Started and ran great but i noticed a knocking sound starting especially at idle. Not super loud but enough to notice at first. After a while it got loud enough to feel it sitting up in the seat. TOTAL PANIC and shut it down. Dropped the oil pan looking for a sucked in sleeve or spun bearing. Looked good. Pulled valve cover and inspected and checked tappet gap at .027 hot. Looked good. Started it back up and knocking still there. Got out the broomstick and started listening for the knock. Found it to be #6 injector. I have had noisy and sticky injectors before but nothing like this. This sounds like a ball peen hammer hitting. I cracked the fuel line to the injector and the motor ran rough and the knocking stopped. So the injector seems to be working fine. Checked pump timing and it is dead on. Has anyone else ran into this? Should I be concerned about it? It does have the old style injectors and I had them rebuilt by a guy in MN who knows his stuff. He won't be back from Florida till mid April. Thanks to all who respond. The help I have recieved here has saved me more time and head scratching then I can imagine!

BkA, that's a good lesson in old school diagnostics. I think you're on to it. You should be concerned. Could that sticking #6 injector be getting slammed shut at combustion? Or is it leaking enough fuel to piston hammer at TDC and telegraphing the knock up the injector? Check fuel and filters again just for fun. But might be best to bag and tag #6 inj. and UPS it to MN before the guy gets back.
Best Regards,
Charlie

You could switch that injector with #1 and see if the knock goes with the injector or stays with the cylinder.

run into this quite a bit with those old 350 olds engines that were converted to diesel in the 1980's . knocking is caused by fuel being poured into the cyl. instead of the usual spray mist. might only require cleaning as something could have went through it and is stuck in the nozzle and seat.send it back and ask for warranty. probably wont get it though as he will say its your fault by installing them. when dealing with injection everything must be spotless clean clean as it only takes a small micron of debri to cause a problem.

On a rotary injection pump like the Roosa Master,a leaking injection nozzle can cause the next cyl in firing order to get short changed for fuel and either one or both of them may knock. What I do when looking for a leaking, sticky nozzle is take off all lines at the nozzle and crank it over with starter and watch the nozzle. If you have a leaker it will push fuel out of that particular nozzle. One of those quick and easy checks I learned that is not found in any books. And yes, a leaky nozzle will make that engine knock like it is flying apart. If you have a piston problem, you should notice a puff in the crankcase breather. Valve, or valve seat, you should hear in exhaust. I wind them up a bit and shut off to allow engine to coast a little and listen to intake and exhaust.