MERCRUISER Drive System
18-2171 ENGINE COUPLER Replaces: 76850A2
18-2172 ENGINE COUPLER Replaces: 14505A2
For all GM engines except MR/ALPHA/BRAVO with "Triangular", 3-Bolt coupler
18-2173 ENGINE COUPLER Replaces: 59826A3
Used when replacing V6 or V8 2 piece rear main seal with 3-1/2" crankshaft bolt pattern to a newer 1 piece rear main seal engine with 3" bolt pattern
For Ford engines
ENGINE COUPLER APPLICATION Model 110 120 120 120 2.5L 2.5L 140 140 140 140 (Inline 6) 3.0L 3.0L 3.0L 3.0L 3.0LX 3.0LX 150 160 165 (Inline 6) 165 (4 Cyl.) 170 (4 Cyl.) 180 (4 Cyl.) 190 (4 Cyl.) 3.7L, 3.7LX 470, 485 470, 488 175 185 185, 205 185, 205 205 262 Mag. EFI (Gen+) 4.3L, 4.3LX 4.3L 4.3LH (Gen+) 4.3LX 4.3LXH (Gen+) 4.3L EFI (Gen+) 4.3L MPI 225 (Ford) 888
Years
Part #
1537370-2044030 1537370-6229717 6229718-0B531853 6229718-0B531853 0B531854-0C853255 0B531854-0C853256 2508261-6229717 6229718-OB450800 6229718-OB450800 1538930-1725960 0B450801-0C85658 0B450801-0C85658 0C856559-0F603999 0L097000 & UP 0C856559-0F000000 0F000001-0L096999 1666495-2048046 2048022-2770031 2770032 & 5813433 0B434941-0B774251
1963-1966 1964-1982 1983-1986 1983-1986 1987-1989 1987-1989 1968-1982 1983-1986 1983-1986 1963 1987-1989 1987-1989 1990-1994 1998-UP 1990-1993 1994-1998 1964-1966 1967-1969 1970-1981 1987
18-2171 18-2171 18-2171 18-2195 18-2171 18-2195 18-2171 18-2171 18-2195 18-2171 18-2171 18-2195 18-2195 18-2323 18-2195 18-2321 18-2171 18-2171 18-2171 18-2414
6916779-0B775248 0B774252 & UP 4208730-6218036 6218037-6916779 B527955-0B773242 6330183-6919655 0A331455-0527954 0A331455-0527954 0B527995-0B775129 0F803800-0K999999 0B527955-0F000877
1985-1987 1988-1989 1976-1982 1983-1984 1987 1983-1984 1985-1986 1985-1986 1987 1996-1997 1988-1993
18-2414 18-2414 18-2413 18-2414 18-2175 18-2171 18-2171 18-2175 18-2175 18-2323 18-2175
0F000878 & UP 3385721-4166999 3108723-4887829
➁ Late Models
1993-2007 1973-1974 1971-1977
18-2323 18-2173 18-2173
Model 190 200 200 228 230 230 5.0L (Alpha) 5.0LX (Alpha) 5.0L (Alpha) 5.0L (Gen+) Alpha 5.0L EFI (Alpha) 5.0L MPI (Alpha) 5.0LX (Alpha) 5.0L (Gen+) Bravo 5.0L EFI (Bravo) 5.0L MPI (Bravo) 898 250, 260 260 260 300 Tempest (Alpha) 300 Tempest (Alpha) 320 EFI 350 Mag (Alpha) 350 Mag (Alpha) 350 Mag EFI (Gen+) Alpha 350 Mag MPI (Alpha) 350 Mag MPI Horizon (Alpha) 350 Mag MPI (Bravo) 350 Mag MPI Horizon (Bravo) 5.7L (Alpha) 5.7L (Alpha) 5.7L EFI (Alpha) 5.7LX (Alpha) 5.7LX EFI (Alpha) 5.7L Bravo 5.7L EFI (Bravo) MX 6.2L MPI MX 6.2L MPI Horizon
➂ MR Cast Coupling
18-4442 ENGINE ALIGNMENT TOOL Replaces: 91-57797A3 For use with all #1 units
Serial #
Years
1564539-1730903 6899058-0B525981 6899058-0B774444 4765100-6899268 6899269-0B773739 6899269-0B773739
1963-1964 1985-1986 1985-1987 1977-1984 1985-1987 1985-1987
18-2171 18-2171 18-2175 18-2171 18-2171 18-2175
Part #
0B773740-0F000000
1988-1993
18-2175
0F000001 & UP
1994-2007
18-2323
0L015751 & UP 4762210-6899057 4768000-6218461 6218462-0B525981 6218462-0B773304 6668677-0B430367 0A434310-0B430367 0A543604-0C622418 0A635178-0F000000
1998-2007 1977-1985 1977-1982 1982-1986 1982-1987 1985-1986 1986 1987-1989 1986-1993
18-2412 18-2171 18-2171 18-2171 18-2175 18-2171 18-2175 18-2175 18-2175
0F000001 & UP 0L010019 & UP
1993-2007 1998-2007
18-2323 18-2412
0M300000 & UP 0B773305-0F000000
1999-2007 1988-1993
18-2412 18-2175
0F000001 & UP
1993-2007
18-2323
0L010035 & UP 0L680003 & UP 0M300000 & UP
1998-2007 2000-2007 2002-2007
18-2412 18-2412 18-2412
➃ MR Stamped Coupling
I/O
➀ Early Models
Serial #
18-9803 SPANNER NUT WRENCH Replaces: 91-36235
717