TD6 problem on diesel in IH Construction Equipment Posted 4 hours ago 3 hours ago, Cully4x4 said: I am going to check all the linkages, to see if they are working okay. There is some slop in the diesel throttle side. the thing is you will hear the click when the mechanism locks in. plus the starter will have a slow crank if its in diesel mode is another way to tell. plus tell us if you have experience with these gas starts as we dont know what u know. i been around them for over forty years. and yes the linkage holes get worn but it still should change over. plus there is adjustment in the manual. the last photo has the Return Spring i am talking about. for some reason pictures are sideways but you have some info.