Rareelectrical Upper Main Bearing Compatible with Mercury 50 Hp 60 Hp 3-Cylinder Looper Jet 45 Hp Sea Pro 55 Hp Mariner Outboard Motor 1991-1997 Replaces 31-812873A1 31812873A1 New Crank Engine Kit

APPLICATIONS: Mercury 3-Cylinder 2.955 Bore Outboard: 50 HP Looper (1991-1997) 60 HP Looper (1991-1997) Jet 45 HP (1991-1997) Sea Pro 55 HP 13-Spline (1995-1997) Mariner: Compatible by part number Component: Upper Main Bearing CROSS REFERENCE: 31-812873A1 31812873A1 SPECIFICATIONS: Type: Upper Main Bearing Engine: 3-Cylinder 2.955 Bore (Looper) Horsepower: 45 / 50 / 55 / 60 HP Brand: Mercury / Mariner Model Years: 1991-1997 Quantity: 1 Per Package PRODUCT DETAILS: Direct replacement upper main bearing for Mercury and Mariner 3-cylinder Looper outboard engines covering 50 HP, 60 HP, Jet 45 HP, and Sea Pro 55 HP models produced between 1991 and 1997. The Looper designation identifies Mercury's loop-charged 2-stroke engine design that was the standard configuration for their mid-range outboard motors during this era. All four horsepower ratings in this family share the same 3-cylinder block with 2.955 inch bore, and the upper main bearing is common across the standard, jet drive, and Sea Pro commercial variants. The upper main bearing supports the crankshaft at the top of the powerhead assembly, and proper bearing condition is essential for maintaining crankshaft alignment and engine reliability. A failing upper main bearing typically presents as increased engine noise, vibration at certain RPM ranges, reduced power output, or visible crankshaft play during engine disassembly. Manufactured to match specifications for reliable performance in Mercury and Mariner outboard powerhead applications. Always confirm your model and part number before purchasing to verify proper fitment for your Mercury or Mariner outboard motor. Verify your part number before purchasing to confirm fitment for your Mercury or Mariner outboard.

• Compatible with Mariner,Mercury. Please verify your OEM part number from your original unit to help ensure fitment.
• Replaces: Part Numbers: / 31-812873A1 31812873A1 / Item Specifications: / Component: Upper Main Bearing / Engine: 3-Cylinder 2.955 Bore Looper / Horsepower: 45/50/55/60 Hp / Brand: Mercury / Mariner / Compatible Models: / 50 Hp Looper 3-Cyl (1991-1997) / 60 Hp Looper 3-Cyl (1991-1997) / Jet 45 Hp 3-Cyl (1991-1997) / Sea Pro 55 Hp 13-Spline (1995-1997) / Applicable Mariner Models By Part Number / Product Details: / Direct Replacement Upper Main Bearing
• Applications: Applications: / Mercury 3-Cylinder 2.955 Bore Outboard: / 50 Hp Looper (1991-1997) / 60 Hp Looper (1991-1997) / Jet 45 Hp (1991-1997) / Sea Pro 55 Hp 13-Spline (1995-1997) / Mariner: Compatible By Part Number / Component: Upper Main Bearing
• Applications: ...
• Upper Main Bearing Source: Aftermarket