Hey all, ive got an old Komatsu D65E-6 with the NH220 in it. when i got it had fuel in the oil, float tank was bypassed. solved that problem. ran good but was getting low on oil pressure. Ran it long enough til it had enough crank pressure to blow the oil fill cap off and blow oil out. Decided to tear it apart and see how bad it was to rebuild. Turns out oil pan pickup screen was plugged full of **** and gunk, so easy find to my oil pressure problem. Inside still looks pretty good but liners are "wavy", gonna say from sitting with rust then ran and who knows how long fuel was washing down the walls. My question is have no clue on the NH220 injectors, seem simple enough but i just wanna make sure. I pulled them all and there is varying amounts of oil in-between the sleeves and injector housings. Is that normal? Should they be sealed tight? Isnt anything sealing between the injector hosuing and sleeve. The needles look clean and straight, first thought is no problems but anything i should check or just go ahead and replace? Caps? Would also be cool if someone had book for setting overheads and torque settings for heads, rods, etc
I did one in an old D85 about 2 years ago. Same engine . Gaskets from KMP were so far out the bolts could not pass through the head into block without die grinding gasket for long time. Injectors are set at 55 inch pounds if I recall correctly and has to be at the correct mark on front damper to pointer. Will say the valve cover gaskets from KMP were good but thats all. I had to helicoil a bunch of the cylinder head exhaust mounting bolt holes as they were worn right out. Made a jig with thick block for drill bit to go in perfectly straight. It worked very well. Most of the shops don't have the tools to change the cylinder head injector sleeves anymore. Simon C
If the oil was diluted with fuel to any point past about a pint the crankshaft main bearings are going to most probably be knackered, the Cummins engine often is fed fuel from a small float tank feed and not hooked up to the main fuel tank, the injectors will leak fuel into the cylinders if piped into the main tank supply, the setting of the injectors is simple enough and involves cleaning the front Aux' pulley outer edge to look for the A,B,C, and TDC marks, the CPL plate will confirm the valve lash and injector set, I would check your crank and if good we will tell you how to set the overhead.
the marks are not on the front damper chap that is on the 6D125 series 8 motor, the marks are on the Aux' pulley in front of the Fuel pump, O.B.C. overhead set.
Your absolutely correct, and I used the wrong word but have done one about a dozen times. I have one of those nice bent bar with serrated pins on it from OTC that make it easy to turn over. The injector and valves for one cylinder are set on the same mark, not like on top stop injector units. Glad you pointed it out as he would of been looking a long time to find marks on damper for adjusting the valves. Have had to sand the pulley a few times before to find the painted over marks. Simon C
I always use the hex that holds the aux pulley on to turn the engine over when setting the overhead, when I have cleaned up the set points on the pulley I Tippex mark them so it's easy to see them, if the injectors are set to tight the engine will be hard to start, if the injectors are to loose set the engine will black smoke in some order.