1. Remove the accessory drive belt (see Section Removing, installing and adjusting the tension force of the auxiliary drive belt).
2. Remove the auxiliary belt pulleys and the upper timing belt cover, then bring the piston of the first cylinder to the TDC position of the end of the compression stroke and remove the timing belt with tensioner and intermediate shaft gear (see Sections Bringing the piston of the first cylinder to the top dead center position (TDC) end of compression stroke, Removal and installation of the timing belt and its covers, Removing, checking the condition and installing gears and timing belt tensioner).
3. Remove the intermediate shaft flange and replace the seals.
4. Install all components removed for access and adjust belt tension.