Mercruiser Engine Couplers

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Model Serial # Years Part#
110 1537370-2044030 1963-1966 18-2171
120 1537370-6229717 1964-1982 18-2171
120 6229718-0 B531853 1983-1986 18-2171
120 6229718-OB531853 1983-1986 18-2195
2.5L OB531854-OC853255 1987-1989 18-2171
2.5L OB531854-OC853256 1987-1989 18-2195
140 2508261-6229717 1968-1982 18-2171
140 6229718-OB450800 1983-1986 18-2171
140 6229718-OB450800 1983-1986 18-2195
140 (Inline 6) 1538930-1725960 1963 18-2171
3.0L OB450801-OC85658 1987-1989 18-2171
3.0L OB450801-OC85658 1987-1989 18-2195
3.0L OC856559-OF603999 1990-1994 18-2195
3.0L OL097000 & UP 1998-UP 18-2323
3.0LX OC856559-OFOOOOOO 1990-1993 18-2195
3.0LX OF000001-OL096999 1994-1998 18-2321
150 1666495-2048046 1964-1966 18-2171
160 2048022-2770031 1967-1969 18-2171
165 (Inline 6) 2770032 & 5813433 1970-1981 18-2171
165(4Cyl.) OB434941-OB774251 1987 18-2414
170(4Cyl.) 180(4Cyl.) 190(4Cyl.) 6916779-OB775248 1985-1987  
3.7L, 3.7LX OB774252 & UP 1988-1989 18-2414
470, 485 4208730-6218036 1976-1982 18-2413
470, 488 6218037-6916779 1983-1984 18-2414
175 B527955-OB773242 1987 18-2175
185 6330183-6919655 1983-1984 18-2171
185,205 OA331455-0527954 1985-1986 18-2171
185,205 OA331455-0527954 1985-1986 18-2175
205 OB527995-OB775129 1987 18-2175
262 Mag. EFI (Gen+) OF803800-OK999999 1996-1997 18-2323
4.3L, 4.3LX OB527955-OF000877 1988-1993 18-2175
4.3L 4.3LH (Gen+) 4.3LX 4.3LXH (Gen+) 4.3L EFI (Gen+) 4.3L MPI OF000878 &UP 1993-2007  
225 (Ford) 3385721-4166999 1973-1974 18-2173
888 3108723-4887829 1971-1977 18-2173
190 1564539-1730903 1963-1964 18-2171
200 6899058-OB525981 1985-1986 18-2171
200 6899058-OB774444 1985-1987 18-2175
228 4765100-6899268 1977-1984 18-2171
230 6899269-OB773739 1985-1987 18-2171
230 6899269-OB773739 1985-1987 18-2175
5.0L (Alpha) 5.0LX (Alpha) OB773740-OFOOOOOO 1988-1993 18-2175
5.0L (Alpha) 5.0L (Gen+) Alpha 5.0L EFI (Alpha) 5.0L MPI (Alpha) 5.0LX (Alpha) OF000001 & UP 1994-2007 18-2323
5.0L (Gen+) Bravo 5.0L EFI (Bravo) 5.0L MPI (Bravo) OL015751 &UP 1998-2007 18-2412
898 4762210-6899057 1977-1985 18-2171
250, 260 4768000-6218461 1977-1982 18-2171
260 6218462-OB525981 1982-1986 18-2171
260 6218462-OB773304 1982-1987 18-2175
300 Tempest (Alpha) 6668677-OB430367 1985-1986 18-2171
300 Tempest (Alpha) OA434310-OB430367 1986 18-2175
320 EFI OA543604-OC622418 1987-1989 18-2175
350 Mag (Alpha) OA635178-OFOOOOOO 1986-1993 18-2175
350 Mag (Alpha) 350 Mag EFI (Gen+) Alpha 350 Mag MPI (Alpha) 350 Mag MPI Horizon (Alpha) OF000001 & UP 1993-2007 18-2323
350 Mag MPI (Bravo) OL010019&UP 1998-2007 18-2412
350 Mag MPI Horizon (Bravo) OM300000 &UP 1999-2007 18-2412
5.7L (Alpha) OB773305-OFOOOOOO 1988-1993 18-2175
5.7L (Alpha) 5.7L EFI (Alpha) 5.7LX (Alpha) 5.7LX EFI (Alpha) OF000001 & UP 1993-2007 18-2323
5.7L Bravo 5.7L EFI (Bravo) OL010035&UP 1998-2007 18-2412
MX 6.2L MPI OL680003 & UP 2000-2007 18-2412
MX 6.2L MPI Horizon OM300000 & UP 2002-2007 18-2412
(1) Early Models
(2) Late Models
(3) MR Cast Coupling
(4) MR Stamped Coupling