![]() To do again I would probably have had it done by a good shop. I had to remove the starter and rotate the flywheel with a pry bar to open the proper valve sequence during the procedure. The hardest thing to do whole performing this task was not being able to access the plug to rotate the crankshaft. My engine was getting noisy at the top end at idle and after adjusting the valves the noise is gone and it seems have improved the overall performance. That might be there recommended point, but I decided to have my valves adjusted at around 70, miles and it made a very noticeable difference. And, I would suggest that better breathing, whether gas or diesel is better for BOTH power and emissions. I don't think adding more moving parts to an engine helps it to be more robust. The more parts added to an engine valve train increases the complexity and possible failure. That may be in part why a legendary manufacturer Caterpillar chose to leave that part of their business. More valves are there to help the engine builders conform to increasingly onerous EPA regulations. I found they were out of adjustment in excess of 4 to 5 thousandth on most of the intake and exhaust valves. ![]() I have though adjusted the valve lash after 36, miles and that made a big difference in the overall noise level from the upper end. I also have this engine in a model American Eagle and it has been a fine operating machine. I'm thinking the 24 valve should be a stronger and more efficient engine than the 12 valve version of the 8. Makes me more comfortable dealing with him. Thanks for the prompt reply, that's good to know and that the salesman had it right, I've talked to many sales people that didn't know a Cummins from a Cat. If anyone has any specific information torque specs, reliability, fuel mileage, know problems, etc it would be greatly appreciated. I'm thinking because it's an older engine that an internet search did not produce anything specific. I'm not saying buy a IHC 2bbl tractor and try and make a liveing You don't want to jump trucks too often Everytime you buy a new truck, you have to get rid of the old, and hopefully you got to know what shape it was in Then you get a new truck and have to start in all over again.New to site and Motorhomes. For the most part Buy the truck, not the engine rateing You can change that down the road if you have money and feel the need Moved my 1st k load from Chicago to Ft Sask. How about the BC4? Cummins N855 Big Cam specifications and bolt torquesĭo they both have the same Holset turbo? Is the BC4 still mechanical? But 's are easyer to find and cost less. What is the maximum hp you can get out of the BC3 without ridiculous modifications like for sled pulling? There are different rateing for each family By erich. There are changes, some of which can be retro-fitted to the older blocks, some can not. Each time they made a design change to the "big cam" it got a new number. So to tell the older from the newer block, they called the new block the "Big Cam" as that was the main differance between it in the older "small cam" engine. ![]() It had small bores then was bored out to CID They were haveing trouble with cam lobes wearing, and incressed the size of the cam allowing for longer "ramp" times on the lobes. Cummins truck block went thru many changes. They stopped useing the "A", as most of their turbo engines from the 70's on were aftercooled. I am correct in thinking that the NTA-prefix means that the engine is aftercooled? The NTC- has a centrifugal water pump? What about the NTA? I saw it rated at as much as hp. It does the engine braking by restricting exhaust flow.I need some help understanding the Cummins Big Cam engines. The VGT also has the integrated exhaust brake function. This turbocharger can block exhaust flow to increase temperatures inside the DPF, which reduces emission levels. So 2 liters of DEF is consumed for every liters of diesel fuel. A diesel particulate filter has a ceramic matrix, which filters soot particles and regenerates them under high temperature, heated by exhaust gases.Īlso, the engine had the exhaust gas recirculation system EGR with cooling. The DPF filter cleans the exhaust gases from soot by more than 90 percent. When it was released inthe engine was the first Cummins diesel which was equipped with a diesel particulate filter DPF. The new version was designed guided by stricter requirements on Federal emissions regulations. There are many changes over the previous 5. On top of the block, there is a valve cast iron cylinder head similar to the ISB 5. The engine block is still made from cast iron. That allowed to increase its displacement to 6. The market needed a new engine for medium-duty trucks and buses and the ISB 6. It was outdated at that moment and depleted the limits of possibilities for improvements in terms of fuel consumption and emissions. ![]()
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