New timing belt idler pulley, MX-5 all models 1989 to 2005.
This pulley requires the timing belt to be removed for replacement, so it may be a good idea to change it (together with the tensioner pulley and spring) at the same time as you do the timing belt change.
We change these as a matter of course, together with the water pump at every other timing belt change.
J1143012. NM00097.
