PDF Instructions for Flywheel Housing Motor Mount Kit No. 21045 Refer to the appropriate Mercury, MerCruiser or Cummins MerCruiser Diesel Service Manual and remove the flywheel housing. Remove the flywheel housing (rear engine) mounts and mount spacers using a suitable mandrel and press (see Fig. C). 1. 2. Install the mount spacers into the transom mounting supports of the