PACCAR MX, PACCAR MX PMCI-2, PACCAR MX-13 PCI and PACCAR MX-13 Engine. Paccar MX 13 Engine Barring Tool. Cummins Engine Barring/Rotating Tool This tool fits the flex plate teeth perfectly, and its load-bearing collar provides friction-free operation while rotating the tool in the housing - Rotating the engine is so easy.