BradHend Posted June 17, 2022 Share Posted June 17, 2022 (edited) Would anyone know for sure what grade the water pump bolts are for a 2015 era 300ISB 5.9 Cummins? I can find every spec for them except the grade - Thread pitch, length, size, torque value etc. I came home today to my coolant on my driveway. Motorhome hasn’t run in a week, just sitting in the driveway. One of the grade 10.9 bolts had snapped off the water pump. I tell ya….some days…. I might add that my torque wrenches all seem to start at 50 Ft-lbs, and I decided to wing it on guessing the Cummins spec of 18 ft-lbs, so that could be a factor. Smaller torque wrench has since been added to my collection. 😄 Edited June 17, 2022 by BradHend Link to comment Share on other sites More sharing options...
Rodger Posted June 17, 2022 Share Posted June 17, 2022 One of the Dodge Cummins forums says they are M8x1.25x22 on a 2004.5 model. One of the other diesel truck forums says M8x1.25x20. Torque calculator on Fastenal site says dry torque of 18.8 ft-lbs and 14.1 ft-lbs if lubricated if it is a grade 8.8 and the values are 26.9 dry/20.2 lubricated if a grade 10.9. Link to comment Share on other sites More sharing options...
klcdenver Posted June 17, 2022 Share Posted June 17, 2022 10.9 is the grade. It is a hardened bolt. Link to comment Share on other sites More sharing options...
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