BASCO Drive Belt Idler Pulley suitable for Isuzu DMax & MUX 4JJ1 3.0 Ltr - EP334. - Isuzu D-Max, fitted with the 4JJ1 3.0 liter 4 cylinder turbo diesel engine, built from 2014 to 06/2020. - Isuzu MU-X, fitted with the 4JJ1 3.0 liter 4 cylinder turbo diesel engine, built from 11/2013 onwards.