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Problems with new engine overhaul
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Posted by '71 3020 on June 29, 2006 at 19:20:20 from (24.180.143.24):
I just finished my first year at tech school for diesel mechanics. I overhauled a 5020 for a neighbor at school this spring. The sleeves were cavitated to the point of almost all of the way through, it had a leaking sleeve packing, and the owner had been running it like that. The cam lobe that drives the fuel transfer pump was totally wiped out. The valve guides were worn worse than any my instructor had ever seen in 30+ years of being a mechanic/teacher. The valves were recessed into the head well beyond spec. The owner of the tractor is ill and we were on a bare-bones budget. The valve guides were knurled, and two of the very worst were replaced. The camshaft was reused. The mechanical transfer pump was replaced with an electric one. The valve seats were reused. The pistons and sleeves were replaced. The injectors (pencil nozzels) were all replaced. The injection pump was sent to the pump shop, but I don't know what they did to it. The engine ran great for what it was when I was done. It ran on the dyno for two hours, and I put about three more hours on it driving around, ect. Today he called me over to listen to it. It had a miss and a ton of blue smoke. He claims it's been like that since he got it back, but I had it running the morning it left and it was fine. He put about two hours on it driving it home. I cracked each fuel line open to see if I could isolate one cyinder, when I retightened line #3, it smoothed out perfect, but some blue smoke remains. What could be going on here, could that electric fuel pump be screwing us up? Like if he turned off the key before shutting off the engine? Would this cause an air lock of sorts? It has no blow-by.
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