MerCruiser 18643A5 18-2323 Alpha One Flywheel Engine Coupler V8 4.3L 5.0L 5.7L
MerCruiser V6 & V8 (1993-2015) Engine coupler for 14" Flywheels and engines that have a ONE piece rear-main oil seal. If you have specific questions on compatibility, feel free to contact us.
- NEW Sierra Part Number 18-2323 *(MerCruiser 18643A5)
- Also found on 140hp GM 4cyl 3.0L models with the 14" flywheel (1999-2016)
- This would be the A2 Model as the A5 had that tube sticking out of it which covered the yoke shaft. The A2 Model didn't have the greasable tube, but you can really use either as they are still interchangeable.
- Same as MerCruiser 18643A7 Sierra 18-2175 (but without yoke)
- This would be for the 14" flywheels. (Don't confuse it for the smaller one for 12" flywheels found on early 3.0L 140hp models.
1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
GM / 4.3L 4.3LX / V6 262 / 175hp 205hp 185hpGM / 5.0L 5.0LX / V8 305 / 200hp 230hp
GM / 5.7L Mag 5.7LX / V8 350 / 260hp 320
GM / 7.4L Bravo Mag / V8 454
Alpha One MR R Gen II
18643A2 18643A5 18643A7 18643A09 18643A9
