Upper Main Bearing Compatible With 1976-1997 Mercury Mariner 6-Cyl 2L 2.4L 135 150 175 200 Hp 3-Cyl

PART NUMBERS:
• 31-74248 / 3174248
• 31-74248T / 3174248T

SPECIFICATIONS:
• Component: Upper Main Bearing (1-1/2" ID)
• Engine: 3-Cyl / 6-Cyl 2-Stroke 2L / 2.4L
• Horsepower: 60-200 HP
• Brand: Mercury / Mariner

APPLICATIONS:
• 3-Cyl 2.955 Bore Looper: 60 HP (1991-1997)
• 6-Cyl 3.125 Bore 2L: 135/150/175 HP (1976-1989)
• 6-Cyl 3.375 Bore 2.4L: 175/200 HP (1978-1988)
• Applicable Mariner models by part number

PRODUCT DETAILS:
Direct replacement upper main bearing for Mercury and Mariner 2-stroke outboard engines with 1-1/2 inch crankshaft journal diameter covering the 3-cylinder Looper 60 HP and 6-cylinder 2L and 2.4L models from 1976 through 1997. This bearing fits the 6-cylinder Mercury 2-liter engine in 135, 150, and 175 HP variants with 3.125 bore, and the 2.4-liter engine in 175 and 200 HP with 3.375 bore including both standard and chrome bore configurations. Also compatible with the 3-cylinder 2.955 bore Looper 60 HP model which shares the same upper main bearing specification. The upper main bearing supports the crankshaft at the top of the powerhead and proper bearing condition is essential for crankshaft alignment and engine reliability in these classic Mercury outboards. A failing upper main bearing presents as engine noise, vibration, reduced power, or visible crankshaft play during inspection. Manufactured to match specifications for reliable performance in Mercury outboard powerhead applications. Always confirm your model and part number before purchasing to verify fitment.

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov