How to: replace a belt-in-oil drive

As Ford’s power transmission supply partner, Dayco designed the world’s first BIO drive system in 2007, when it developed the engineering solution to supersede the previous chain-driven, high pressure injection pump for the popular 1.8-litre ‘Lynx’ engine, which had been widely used to power various Focus, C-Max, S-Max, Mondeo, Galaxy, Tourneo Connect and Transit Connect models between 1998 and 2013.

Although Ford only specify replacement of the injection pump drive components when the engine reaches 120,000 miles, Dayco recommends that, as industry best practice and to provide motorists added peace of mind, workshops follow the vehicle’s service interval for the scheduled timing drive replacement  and replace the injector pump drive at the same time. As well as avoiding the possibility of a subsequent failure, this policy allows workshops to update older units and replace their chain driven system with the latest BIO version, as it is a direct replacement.

Although the timing belt on this unit is one of the shortest in common use and the drive layout simple, some may be tempted to change just the belt, which can have catastrophic consequences. As a result, Dayco has addressed the importance of replacing all the drive components and following the correct installation process in a previous Technical Focus, which is available on request.

When it comes to the injection pump drive replacement, all the steps necessary for the timing drive replacement need to be followed, which endorses the fact that both should be replaced in unison. However, in

addition, the replacement requires the removal of the auxiliary belt idler pulley, injection pump timing drive pulley and the crankshaft pulley, the bolt for which should be discarded, this will allow the removal of the injection drive cover.