Collection: 70-90 HP 1987-2006

The following diagram is for a Mercury/Mariner Powerhead for 3 Cylinder 70-90 HP models from 1987-2006. 

The following parts correspond to the numbers on this diagram:

1. Thermostat
• 1987-1993 (143°)
• 1988-2003 (120°)
  

We recommend the following kits for this powerhead:

• Gasket Set
• Carburetor Kit
• Fuel Pump Kit
• In-Line Check Valve
• 90° Check Valve

The following diagram is for a Mercury/Mariner Crankshaft Assembly for 3 Cylinder 70-90 HP models from 1987-2006. 

The following parts correspond to the numbers on this diagram:

1. Rod Bearing with Cage
2. Wrist Pin Bearings
• 1987-1991 (Bottom guided, Use w/ rod #638-8532-1)
• 1992-2003 (Top guided, Use w/ rod #646-818846)
3. Lower Main Bearing
4. Rod Bolt
5. Upper Main Bearing
6. Connecting Rod
• Bottom Guided
• Top Guided

Although not numbered on the diagram, the following items are available for purchase:

• Crankshaft Seal Kit
• Center Main Bearing