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Saying it's a six cylinder engine doesn't narrow it down at all, seeing as the inline six is the most common configuration for Cummins diesels. The 6BT, ISB, L10, ISL9, ISL, M11, ISM, N14, ISX, Signature, and many others were six cylinder engines, and many of their even larger industrial diesels are, as well. What the valve clearance is... well, we'd need the model for that.
For a regular, line haul tractor such as the Coronado, Coronado SD, or Cascadia, you'll have the options of the Detroit Diesel DD13 or DD15, or the Cummins ISX12 or ISX15. For smaller models, such as the FL112, which are typically used for vocational trucks or local P&D trucks, the Detroit Diesel 50 Series or Cummins ISM or ISL9 can be had.The Mercedes-Benz MBE4000 12.8 liter was an available option for Freightliner, Western Star, and Sterling trucks (all three of which were Daimler A.G. subsidiaries; Sterling trucks went out of production in 2009). This engine replaced the pre-02 emissions Detroit Diesel 12.7 liter 60 Series.Caterpillar engines were available until Cat left the highway diesel market in 2009, following the disastrous debut of the SDP engines. Their repute was already suffering on account of the ACERT engines, and the SDP was the final nail in that coffin.