Abstract: A marine stern drive (10) has an engine output coupler with a coupler hub (56) having an axially splined opening (58) receiving the forward splined end (28) of the output drive shaft (24). The coupler hub has a pair of axial channel passages (60, 62) therein spaced radially outwardly of the splines (58), radial channel passages (64-69) extending radially inwardly from the axial channel passages, and inner circumferential channel passages (70, 72, 74) extending circumferentially around the axial splined opening in the coupler hub and intersecting the splines (59), A grease fitting (76) on the coupler hub communicates with one of the axial channel passages such that grease introduced at the fitting flows through the axial channel passages, through the radial channel passages, and through the circumferential channel passages, to lubricate the splines of the coupler hub and the output drive shaft.

Abstract: A plastic oil pan (16) for an internal combustion engine (14) has an upper lip (18) for mating with the engine in sealing relation, sidewalls (21-24) depending downwardly below the lip, a bottom (26) extending between the sidewalls below the lip to provide a closed-bottom receptacle for holding engine oil, and a plurality of reinforcing walls (28, 30, 36, 38, 40) integrally formed along the sidewalls and increasing the mechanical strength of same to enable the plastic oil pan to support the engine when the latter rests on the oil pan during installation or repair procedures. A conduit (54) extends through the oil pan and passes engine coolant therethrough to cool the engine oil. Particular oil pan and conduit structure is disclosed.