Replacing Seals and Installing the Timing Belt on Renault Trafic 2.5 G9U. • Today we are working on a Renault Trafic with a 2.5-liter G9U diesel engine. In this video, we will carefully go through the process of replacing the crankshaft seals and installing the timing system components, including: • the tensioner pulley, • the idler pulley, • the timing belt. • 🔧 Features of the G9U engine: • This engine is quite reliable and, with proper maintenance, can cover high mileage without major issues