How To: Change Mercruiser Alpha 1 Sterndrive Impeller
- By Fix4Dirt
The Alpha 1 was a pretty popular merc outdrive, usually came behind a GM 4.3, 5.7, or I believe some boats had a magnum of some sorts.
Parts: Impeller, SAE 90 Gear Lube
1. With the drive in neutral, drain the gear lube (remove the vent plug & drain plug)
2. Loosen 4 bolts holding the upper unit to the lower unit (5/8 in) and leave the bottom two loose but finger tight in order to hold it.
3. At the rear top of the unit, you will find a bolt in a "hole" in the unit. (1/2 in)
4. At the front...
Parts: Impeller, SAE 90 Gear Lube
1. With the drive in neutral, drain the gear lube (remove the vent plug & drain plug)
2. Loosen 4 bolts holding the upper unit to the lower unit (5/8 in) and leave the bottom two loose but finger tight in order to hold it.
3. At the rear top of the unit, you will find a bolt in a "hole" in the unit. (1/2 in)
4. At the front...