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Common rail melt down
I thought you guys and gals would like to look at a ISB meltdown , this engine was still running when it came in , but smoking white... because it had a DPF filter system , it wasnt as much smoke as we would normally see, this is the results of a injector needle sticking. the pictures are in the gallery, I dont know how to post them on here , you will notice that the exhaust valve seat have dropped and the intake valves have started to tulip in from the extreme heat, the piston degraded, and you can just make out marks on the piston where the exh. valve had just made contact , if that piston had not degraded earlier, we would have had a major failure. originally the tech was going to just put a injector in and thank god he notice the screw adjustment on the exh side didnt quite match the height of the other exh valve screws, that is something we teach all techs to make sure the screw heights always match the others. he came and got me and I had him remove the rocker and crosshead, we then notice the height of both exh. valves were lower than the rest. , so off came the head and here are the results. This was in a large school bus
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no pics.........
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guess they are still waiting approval. they will be there soon [whistle]
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Originally Posted by JohnCA58
I thought you guys and gals would like to look at a ISB meltdown , this engine was still running when it came in , but smoking white... because it had a DPF filter system , it wasnt as much smoke as we would normally see, this is the results of a injector needle sticking. the pictures are in the gallery, I dont know how to post them on here , you will notice that the exhaust valve seat have dropped and the intake valves have started to tulip in from the extreme heat, the piston degraded, and you can just make out marks on the piston where the exh. valve had just made contact , if that piston had not degraded earlier, we would have had a major failure. originally the tech was going to just put a injector in and thank god he notice the screw adjustment on the exh side didnt quite match the height of the other exh valve screws, that is something we teach all techs to make sure the screw heights always match the others. he came and got me and I had him remove the rocker and crosshead, we then notice the height of both exh. valves were lower than the rest. , so off came the head and here are the results. This was in a large school bus
common problem ive never replaced an entire cummins diesel until 04.5 then i repalced 5 of them 2 in one truck. only other faliures ive ever seen are the 2 53 blocks. Common rail fuels system maintaince is critical to the life of the engine. additives and filter changes are a must |
it is not a common problem, no matter what year engine.... these engine have been very reliable. this could have been a failure of poor maintenance of the fuel system and filter change are important when they are required, but keeping dirt out and using clean fuel is more important, this school district has over a 150 buses in the fleet and with tight budget are known to cut corners and use the cheapest items available. This particular engine was a 02 EGR with VGTurbo, in the last five years we have been avg. one 53 block replacement a month. but that is the result of poor block casting. not operator error or poor maintenance.
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Is that motor computer controlled?
Rick |
Rick , pretty much the same engine that is in your truck , few different components and locations. HPCR engine
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I was courious as to the differences in the programming of the ecm if any and maybe some advantages of that programming over what we have stock.
Rick |
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