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Caterpillar withdrew from the truck engine sector in 2009 after having problems (and law suits) with EPA 2007 (Tier 4) regulations before EPA 2010 was phased in. But the Acert technology was still good enough for applications with lower emission standards. The C32 Acert is EPA Tier 3 marine certified. I didn't find any Tier 4 marine certified C32 Acert engines in the May 2017 Marine Power Solutions broschure. I did find a Tier 4 marine compliant Caterpillar C32 using exhaust aftertreatment, a clean emission module (CEM) that contains among others SCR but no DPF: <a href="http://www.pattencat.com/power/new-power-equipment/marine-power-systems/commercial-propulsion-engines/c32-tier-4-imo-iii">http://www.pattencat.com/power/new-power-equipment/marine-power-systems/commercial-propulsion-engines/c32-tier-4-imo-iii</a> Does it still have Acert? Regards, Volker
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