Re: Mariner 40 HP Lower unit
your mariner was made by yamaha. the mariner part# for a15 inch shaft is:1651-7994M and the 20 inch is part#: 1651-7995M. a yam. two cyliner c40 (1990 to1993) will have a similar lower unit. i never tryed the swap my self but if you find a yam. lower- try a side-by-side comparison. this lower is avalable used. good luck!