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Bearing Lower Unit - Mercury / Mariner / Mercruiser 105-400 HP (1976-2006, 2008-2018) OEM# 31-36387A1 | WSM 447-300
Bearing Lower Unit - Mercury / Mariner / Mercruiser 105-400 HP (1976-2006, 2008-2018) OEM# 31-36387A1 | WSM 447-300
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Bearing Lower Unit Mercury / Mariner / Mercruiser 105 - 400 Hp OEM# 31-36387A1
This WSM bearing lower unit is a quality aftermarket replacement part designed for Mercury 4 Cyl 4 Stroke 135 and 14 other compatible models.
It replaces selected OEM reference numbers including 31-36387A1, 31-8M0146566, 8M0146566, 9-75107, S18-1143 and is suitable for service, repair and rebuild work.
Key Features
- Quality replacement component for service and rebuild work
- Designed for dependable fitment and durable performance
- Suitable for restoring smooth operation and reducing wear
- Compatible with 128 listed fitments
- Replaces selected OEM reference numbers listed below
Product Details
- Brand: WSM
- WSM Part Number: 447-300
- Product: Bearing Lower Unit
- OEM Reference: 31-36387A1, 31-8M0146566, 8M0146566, 9-75107, S18-1143
- Application: Mercury 4 Cyl 4 Stroke 135 and 14 other compatible models
Product Fitment
This part is suitable for the following models:
- Mercury 4 Cyl 4 Stroke 135 – 2008
- Mercury 4 Cyl 4 Stroke 135 – 2009
- Mercury 4 Cyl 4 Stroke 150 – 2008
- Mercury 4 Cyl 4 Stroke 150 – 2009
- Mercury 4 Cyl 4 Stroke 150 – 2010
- Mercury 4 Cyl 4 Stroke 150 – 2011
- Mercury 4 Cyl 4 Stroke 150 – 2012
- Mercury 4 Cyl 4 Stroke 150 – 2013
- Mercury 4 Cyl 4 Stroke 150 – 2014
- Mercury 4 Cyl 4 Stroke 175 – 2008
- Mercury 4 Cyl 4 Stroke 175 – 2009
- Mercury 4 Cyl 4 Stroke 175 – 2010
- Mercury 4 Cyl 4 Stroke 175 – 2011
- Mercury 4 Cyl 4 Stroke 175 – 2012
- Mercury 4 Cyl 4 Stroke 175 – 2013
- Mercury 4 Cyl 4 Stroke 175 – 2014
- Mercury 4 Cyl 4 Stroke 200 – 2008
- Mercury 4 Cyl 4 Stroke 200 – 2009
- Mercury 4 Cyl 4 Stroke 200 – 2010
- Mercury 4 Cyl 4 Stroke 200 – 2011
- Mercury 4 Cyl 4 Stroke 200 – 2012
- Mercury 4 Cyl 4 Stroke 200 – 2013
- Mercury 4 Cyl 4 Stroke 200 – 2014
- Mercury 4 Cyl 4 Stroke 200 – 2015
- Mercury 4 Cyl 4 Stroke 200 – 2016
- Mercury 4 Cyl 4 Stroke 200 – 2017
- Mercury 4 Cyl 4 Stroke 200 – 2018
- Mercury 6 Cyl 2.5L XS 200 – 2001
- Mercury 6 Cyl 2.5L XS 200 – 2002
- Mercury 6 Cyl 2.5L XS 200 – 2003
- Mercury 6 Cyl 2.5L XS 200 – 2004
- Mercury 6 Cyl 2.5L XS 200 – 2005
- Mercury 6 Cyl 2.5L XS 200 – 2006
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1986
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1987
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1988
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1989
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1990
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1991
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1992
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1993
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1994
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1995
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1996
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1997
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1998
- Mercury 6 Cyl 3.125 Bore 2L 135 – 1999
- Mercury 6 Cyl 3.125 Bore 2L 135 – 2000
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1978
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1979
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1980
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1981
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1982
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1983
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1984
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1985
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1986
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1987
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1988
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1989
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1990
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1991
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1992
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1993
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1994
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1995
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1996
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1997
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1998
- Mercury 6 Cyl 3.125 Bore 2L 150 – 1999
- Mercury 6 Cyl 3.125 Bore 2L 150 – 2000
- Mercury 6 Cyl 3.125 Bore 2L 150 – 2001
- Mercury 6 Cyl 3.125 Bore 2L 150 – 2002
- Mercury 6 Cyl 3.125 Bore 2L 150 – 2003
- Mercury 6 Cyl 3.125 Bore 2L 150 – 2004
- Mercury 6 Cyl 3.125 Bore 2L 150 – 2005
- Mercury 6 Cyl 3.125 Bore 2L 175 – 1976
- Mercury 6 Cyl 3.125 Bore 2L 175 – 1977
- Mercury 6 Cyl 3.125 Bore 2L 175 – 1978
- Mercury 6 Cyl 3.125 Bore 2L 175 – 1979
- Mercury 6 Cyl 3.125 Bore 2L 175 – 1980
- Mercury 6 Cyl 3.125 Bore 2L 175 – 1981
- Mercury 6 Cyl 3.2283 Bore Verado 400 – 2015
- Mercury 6 Cyl 3.2283 Bore Verado 400 – 2016
- Mercury 6 Cyl 3.2283 Bore Verado 400 – 2017
- Mercury 6 Cyl 3.2283 Bore Verado 400 – 2018
- Mercury 6 Cyl 3.375 Bore 2.4L 175 – 1981
- Mercury 6 Cyl 3.375 Bore 2.4L 175 – 1982
- Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1978
- Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1979
- Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1980
- Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1981
- Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1982
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1983
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1984
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1985
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1986
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1987
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1988
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1989
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1990
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1991
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1992
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1993
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1994
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1995
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1996
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1997
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1998
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1999
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1982
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1983
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1984
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1985
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1986
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1987
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1988
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1989
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1990
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 220 – 1987
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 220 – 1988
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 220 – 1989
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 220 – 1990
- Mercury 6 Cyl 3.375 Chrome Bore 2.4L 220 – 1991
- Mercury 6 Cyl 3.501 Bore 2.5L 200 – 1991
- Mercury 6 Cyl 3.501 Bore 2.5L 200 – 1992
- Mercury 6 Cyl 3.501 Bore 2.5L 200 – 1993
- Mercury 6 Cyl 3.501 Bore 2.5L 200 – 1994
Why Buy WSM
WSM is a trusted manufacturer of aftermarket marine and powersports parts, known for dependable quality, strong fitment coverage and workshop-ready replacement components.
You May Also Need
Browse related parts for compatible models:
- Tilt Tube Stainless Steel Mercury / Mariner / Force 65 - 300 Hp OEM# 826125A1 – 986-165
- O-Ring End Cap Mercury / Mariner / Mercruiser 70 - 240 Hp OEM# 25-54029 – 526-18
- O-Ring Crankshaft Chrysler / Force / Mercury / Mariner / Mercruiser / Yamaha 6 - 300 Hp OEM# 25-90011 – 526-13
- O-Ring End Cap Mercury / Mariner / Mercruiser 90 - 485 Hp OEM# 25-62700 – 526-19
Please use the fitment guide, OEM references and images to confirm this is the correct part before ordering.
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