i have seen two engines with damage at the #1 cylinder it get less air then the others just like #6 does but it gets more then #6 so it dosnt get as hot. try this before you do the compression test. try swapping the #1 injector to #3 and see if that causes #3 to knock instead. that will tell you if its a fuel knock or if it is cylinder related. to do the compression test unplug the lift pump and the injection pump that will keep it from sending fuel to the lines while the injectors are out.

I'll get some copper washers and tube orings this week and give it a try.

Cummins are a parobore engine they are not sleeved, but you could sleeve them but I wouldent recommend it untill you have reacheced the max bore out which is .60 over. If you had to replace a piston you can assess and see have bad it has wore the cylinder if you cant feel it with your fingernail you can deglaze it and then rehone and crosshatch...

Can you overbore say .020 on just the one hole and hone/ re-ring the other 5 ?

Im still thinking fuel knock. Start it up snd crack the injector lines one at a time. Start at #1 and if rhe knock does not go away tighten it back up and try the next. Adjusting your valves could definately help alsoo

You can but not recommended because the rest of the cylinders will be unbalanced. Do what cummins kid said also! crack the injection lines one at a time and see if anything changes...

I did that the other day see the end of post #20.

Cracking #1 quieted it down some and as soon as you started to tighten that one I got 3 loud knocks then went back to the faint knock. I tried a couple other cylinders and it killed the motor some, but when i tightened the lline no knock.

That #1 when tightening it though 3 good knocks TICK TICK TICK then settles out. I will pull #1 injector and test the compression. If the compression is good i'll pull the rest and have them all pop tested.

Got to order the copper washers and o ring's for the tubes 1st.

Oh sweet! so some progress has been made hope its just a fuel knock..

You can pull the fuel relay that should keep the Vp44 from shooting fuel..

i wanna know where you get a .60 over piston?? we sleeve single cylinders in them all the time there is no reason not to. the sleeved cylinder is stronger then the stock cylinders.

napa, thurobred diesel. Im not saying sleeves are bad, but its "one more thing to go wrong" water leaks. .60 overs can be bought, I have a set sitting inside a 4BT cummins at the moment... its a to each his own.