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Mercruiser R-Style Identification

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Manufacturer Mercury Marine
Engine Type I/O
Repair Time Less than 30 mins
Repair Difficulty Easy
Engine HP Displacement Litre/CID Cylinders Gear Ratio Tooth Count Year
2.5 Litre 120 120 2.5/153 4 In-line 1.98 24-24 69-83
3 Litre 140 130 3.0/181 4 In-Line 1.98 20-24 69-83
165 165 3.7/224 6 In-Line 1.65 24-24 69-83
470 170-190 4.3/262 4- In-Line 1.84 17-19 69-83
215-233 205-230 351 V-8 1.50 20-22 69-83
260 260 5.7/350 V-8 1.50 20-22

MRAC165N - Mercruiser Alpha One Complete Driveshaft Assembly
MRALN - Mercruiser Alpha One Lower Driveshaft Assembly
MRAU165N - Mercruiser Alpha One Upper Driveshaft Assembly