This listing is for the idler gear assembly LH with bearing and hub. Detroit Number: 5113817 We have dismantled an almost new Detroit Diesel 16-92 tt engine used to drive hospital emergency standby generator. It was removed from hospital for EPA reasons. It only had 363 total running hours of use. We ran this engine and it was really a beautiful piece. We ran it by controlling the rack, because we did not get the electric governors with the machine. We dismantled it completely, cleaned and hot tanked the parts and are offering these like new parts for sale at very reasonable prices. We have sold the cylinder heads, but have all the rest. Contact us for your needs. The liners with pistons, crosshead rods were removed with the crosshatch still very apparent. Contact us for your needs or to see the individual parts listings we have so far listed. The pictures of the intact engine are shown merely as a reference. This listing is only for the actual part listed. These parts are for local pickup only or you can contact us and we can calculate a freight rate for you.