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I took my information for the C32 CEM from Cat FAQs but overlooked that they were for Tier 4 interim. I found a Caterpillar Application & Installation guide: s7d2.scene7.com/is/content/Caterpillar/CM20170512-29478-31036 On page 11 is Table I.1-3 Caterpillar Clean Emissions Strategy Table which shows the use of AUS/DEF and SCR for the C32 Acert engine for marine and Petro off shore applications. Pages 46 and 47 show U-flow and Z-low schematics. U-flow means inlet and outlet are on the same wall, Z-flow means inlet and outlet are offset on opposing walls. Regards, Volker Edit: The above mentioned table I.1-3 contains information for the C175 platform for marine applications too. For Tier 4 marine compliance it uses AUS/SCR plus SCR but no DPF. The Tier 4 emissions standards for locomotive/ marine are: - NOx: 1.3/ 1.32 - PM:   0.3/ 0.294 - HC:   0.14/ 0.14 All values are given in g/bhp-hr. While locomotive limit values are given by EPA in g/bhp-hr they are given in g/kW-hr for Marine applications. The differences come from converting to g/bhp-hr. A marine Tier 4 engine would be locomotive Tier 4 compliant. So again, there is no DPF used on the C175-20.
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