Fritz Maurer
Well-known Member
Got a NT290 in a Ford truck, with top-stop injectors. On the spec tag it says to set the links at zero lash. The Cummins manual goes on to say that the screw is tightened to 5 inch pounds and that you should be able to reach down under the rocker arm and spin the link with a finger. This has never been the case, its either one or the other. Since I dont have the official torque wrench, I always went with the zero lash method and it always turns out bad ( late timing at idle, white smoke). All my other 855s have PT injectors, which are torqued in the cup, and I never have any problems with these. But the Cummins book does not specifically say that that method can be used with top-stop injectors. So... can you torque top-stops in the cup, or do I have to get that special torque wrench before it will be right? Thanks, Fritz