Seal Inner Propshaft Mercruiser MC-1 R Alpha One Gen 2 Mercury Mariner V6 Outer Propshaft Seal fits:
Mercruiser MC-1, R, Alpha One, Alpha One Gen. II Sterndrives,
Mercury/Mariner 6 cyl, 3.0L Outboards
Bearing Seal Kit for Mercruiser Lower Unit 1 and R Drives 1974-1982 31-803068T1
Lower Unit Seal And Bearing Kit For Mercruiser R Drive
1974 to 1982 with Preload Pin on the Vertical Drive Shaft. The Preload pin is a small 1/4 inch diameter by about 5/8 high pin that sticks out of the lower unit drive shaft. This model outdrive is called the R and #1. NOT ALPHA 1. In addition to the preload pin the #1 and R drives will NOT have a retaining nut under the water pump housing. Includes Bearings Gaskets Shims and Seals for the lower unit.