MAN Diesel recently retrofitted the M/F Geisnes pendulum ferry’s engine to Tier II limits. This retrofit solution achieves a 30% NOx reduction. The MAN 6L23/30 main engine originally installed in M/F Geisnes was built in Frederikshavn, Denmark, in 1988 - and after the delivery of the ferry in 1989, it has served the vessel for 96,842 operating hours. In connection with the major overhaul of the main engine, it was decided by the Norwegian owner, Namsos Trafikselskab, to retrofit an upgrade package with Tier II engine components.