Sierra Marine Parts Catalog: Mercruiser
ENGINE COUPLER
ENGINE COUPLER
Replaces: 18643A5
Replaces: 12632A6
(Same as 18-2175 without yoke)
(Same as 18-2195 without yoke)
ENGINE
ENGINE
ENGINE
COUPLER
COUPLER
COUPLER
Replaces: 69354A2
Replaces: 97432A2
Replaces: 18311A17, 861523A9
For: 470, 485 (224 cu. in.)
For: 165, 170, 470, 3.7L S/N 6170297 & UP (1983-1989)
For: Bravo
S/N 4208730-6218036 (1976-1982)
180, 190, 488, 3.7LX S/N 6170297 & UP (1983-1989)
ENGINE
ENGINE COUPLER
ENGINE
COUPLER
Replaces: 14505A2
COUPLER
Replaces: 76850A2
Used when replacing V6 or V8 2 piece rear main seal
Replaces: 59826A3
with 3-1/2" crankshaft bolt pattern to a newer 1 piece
For all GM engines except MR/ALPHA/BRAVO
rear main seal engine with 3" bolt pattern
For Ford engines
with "Triangular", 3-Bolt coupler
ENGINE COUPLER APPLICATION
HP
Liter
Model
CID # Cyl Stroke Years
Serial #
Part #
HP
Liter
Model
CID # Cyl Stroke Years
Serial #
Part #
110
110
153
4
1963-1966
1537370 - 2044033
190
283
V-8
4
1963-1964
1564539 - 1730903
120
120
153
4
1964-1982
1537370 - 6229717
5.0L
200
305
V-8
4
1985-1986
6899058 - B525981
❾
120
120
153
4
4
1964-1982
1666601 - 6229717
5.0L
200
305
V-8
4
1985-1986
6899058 - B525981
❸
120
120
153
4
4
1983-1986
6229718 - B531853
5.0L
200
305
V-8
4
1985-1987
6899058 - B774444
❾
120
120
153
4
4
1983-1986
6229718 - B531853
5.0L
228
305
V-8
4
1977-1982
4765100 - 6218461
❸
2.5L
2.5L
153
4
4
1987-1989
B531854 - C853255
5.0L
228
305
V-8
4
1977-1984
6218462 - 6899268
❾
2.5L
2.5L
153
4
4
1987-1989
B531854 - C853256
5.0L
230
305
V-8
4
1985-1987
6899269 - B773739
❸
❾
140
140
181
4
4
1968-1982
2508261 -6229717
5.0L
230
305
V-8
4
1985-1987
6899269 - B773739
❸
140
140
181
4
4
1983-1986
6229718 - B450800
5.0L
5.0L ALPHA
305
V-8
4
1988-1993
B774445 - F000000
❾
140
140
181
4
4
1983-1986
6229718 - B450800
5.0L
5.0L ALPHA
305
V-8
4
1994-1995
F000001 - F600999
❸
140
140 INLINE 6
6
4
1963
1538930 - 1725960
5.0L
5.0L GEN+ ALPHA
305
V-8
4
1998-2010
L015751 & UP
3.0L
3.0L
181
4
4
1987-1989
B450801 - C856558
5.0L
5.0L GEN + BRAVO
305
V-8
4
1998-2010
L015751 & UP
❾
❽
3.0L
3.0L
181
4
4
1987-1989
B450801 - C856558
5.0L
5.0L EFI ALPHA
305
V-8
4
1998-2001
L012052 - M299999
❸
5.0L
5.0L EFI BRAVO
305
V-8
4
1998-2001
L015751 - M299999
3.0L
3.0L
181
4
4
1990-1994
C856559 - F603999
❽
3.0L
3.0L
181
4
4
1998-2010
L097000 & UP
5.0L
5.0LX ALPHA
305
V-8
4
1988-1993
B773740-F000000
3.0L
3.0L MPI
181
4
4
2008-2010
A072812 & UP
5.0L
5.0LX ALPHA
305
V-8
4
1994-2007
F000001 & UP
3.0L
3.0LX
181
4
4
1990-1993
C856559 - F000000
5.0L
5.0L MPI BRAVO
305
V-8
4
1998-2007
L015751 & UP
3.0L
3.0LX
181
4
4
1994-1998
F000001 - L096999
5.0L
5.0L MPI ALPHA
305
V-8
4
2002-2010
M300000 & UP
150
150
4
1964-1966
1666495 - 2048046
5.0L
5.0L MPI BRAVO
305
V-8
4
2002-2010
M300000 & UP
❽
160
160
4
1967-1969
2048022 - 2770031
5.0L
5.0LX ALPHA
305
V-8
4
1988-1993
B773740 - F000000
„
165
165
224
4
4
1987
B434941 - B774251
5.0L
5.0LX ALPHA
305
V-8
4
1994-1995
F000001 - F600999
165
165 INLINE 6
6
4
1970-1981
2770032 - 5813433
5.0L
898
305
V-8
4
1977-1985
4762210 - 6899057
170
170
224
4
4
1985-1986
6916779 - B434940
225 (GM)
327
V-8
4
1963-1969
1539620 - 2694014
180
180
224
4
4
1987
B436391 - B775248
250
327
V-8
4
1977
4768000 - 4908849
190
190
224
4
4
1985-1987
6916779 - B775248
5.7L
260
350
V-8
4
1978-1982
4908850 - 6218461
3.7L
3.7L
224
4
4
1988-1989
B774252 & UP
5.7L
260
350
V-8
4
1982-1986
6218462 - B525981
❾
5.7L
260
350
V-8
4
1982-1987
6218462 - B773304
3.7L
3.7LX
224
4
4
1983-1989
B775249 & UP
❸
5.7L
260
350
V-8
4
1987
B525982 - B773304
470
224
4
4
1976-1982
4208730 - 6218036
5.7L
300 TEMPEST ALPHA
350
V-8
4
1985-1986
6668677 - B430367
470
224
4
4
1983-1984
6218037 - 6916779
❾
485
224
4
4
1980-1982
5685394 - 6218036
5.7L
300 TEMPEST ALPHA
350
V-8
4
1986
A434310 - B430367
❸
5.7L
320 EFI
350
V-8
4
1987-1989
A543604 - C622418
488
224
4
4
1983-1984
6170297 - 6916779
5.7L
350 MAG ALPHA
350
V-8
4
1986-1993
A635178 - F000000
140
194
6
4
1963
1538930 - 1664117
5.7L
350 MAG ALPHA
350
V-8
4
1993-1997
F000001 - K999999
150
230
6
4
1964-1966
1664118 - 2048046
5.7L
350 MAG ALPHA EFI GEN +
350
V-8
4
1996-1997
F800300 - K999999
160
250
6
4
1967-1969
2048022 - 2770031
5.7L
350 Mag MPI ALPHA
350
V-8
4
1998-2010
L010019 & UP
165
250
6
4
1970-1981
2770032 - 5813433
5.7L
350 MAG MPI BRAVO
350
V-8
4
1998-2010
L010019 & UP
175
175
4
1987
B527955 - B773242
❽
5.7L
350 MAG MPI HORIZON ALPHA
350
V-8
4
2002-2007
M300000 - A299999
185
185 (4bbl)
229
6
4
1983-1984
6330183 - 6919655
5.7L
350 MAG MPI HORIZON BRAVO
350
V-8
4
2002-2007
M300000 - A299999
175
175
262
V-6
4
1987
B527955 - B773242
❽
5.7L
350 MAG MPI HORIZON ALPHA
350
V-8
4
1993-2007
F000001 & UP
185
185 (2bbl)
262
6
4
1985-1986
A331455 - B527954
❾
5.7L
HORIZON BRAVO
350
V-8
4
1999-2007
M300000 & UP
185
185 (2bbl)
262
6
4
1985-1986
A331455 - B527954
❸
205
205
262
6
4
1985-1986
A331455 - B527954
21-2171
5.7L
5.7L ALPHA
350
V-8
4
1988-1993
B773305-F000000
❾
205
205
262
6
4
1985-1986
A331455 - B527954
5.7L
5.7L ALPHA
350
V-8
4
1993-2010
F000001 & UP
❸
205
205
262
6
4
1987
B527995 - B775129
5.7L
5.7L BRAVO
350
V-8
4
1988-2010
B773305 & UP
❽
262 MAG EFI GEN+
262
V-6
4
1996-1997
F803800 - K999999
5.7L
5.7L EFI ALPHA
350
V-8
4
1995-2001
F225560 - M299999
4.3L
4.3L
262
V-6
4
1988-1993
B527955 - F000877
5.7L
5.7L EFI BRAVO
350
V-8
4
1998-2001
L010035 - M299999
❽
4.3L
4.3L
262
V-6
4
1993-2010
F000878 & UP
5.7L
5.7LX EFI ALPHA
350
V-8
4
1996-1997
F752400 - K999999
4.3L
4.3L EFI GEN +
262
V-6
4
1998-2001
L012009 - M299999
5.7L
5.7LX EFI ALPHA
350
V-8
4
1993-2007
F000001 & UP
4.3L
4.3L MPI
262
V-6
4
2002-2010
M300000 & UP
5.7L
5.7L EFI BRAVO
350
V-8
4
1998-2007
L010035 & UP
❹
4.3L
4.3LH GEN +
262
V-6
4
1998-2002
L010044 - M614999
5.7L
233
351
V-8
4
1975-1977
4173000 - 4902304
4.3L
4.3LX
262
V-6
4
1988-1993
B775130 - F001219
6.2L
377 MAG
377
V-8
4
2008-2010
A300000 & UP
❽
4.3L
4.3LX (4bbl)
262
V-6
4
1993-1995
F001220 - F802999
6.2L
MX 6.2L MPI
377
V-8
4
2000-2007
L680003 - A299999
❽
4.3L
4.3LX GEN + (2bbl)
262
V-6
4
1996-1997
F803000 - K999999
6.2L
MX 6.2L MPI
377
V-8
4
2000-2007
L680003 - A299999
N/A
❷
4.3L
4.3LXH GEN +
262
V-6
4
1996-1997
F803000 - K999999
6.2L
MX 6.2L MPI HORIZON
377
V-8
4
2002-2007
M300000 - A299999
❽
5.0L
225 (FORD)
302
V-8
4
1973-1974
3385721 - 4166999
7.4L
454 MAG ALPHA
454
V-8
4
1986-1988
A631894 - B785148
❻
❿
5.0L
888
302
V-8
4
1971-1977
3108723 - 4887829
Use with Borg Warner transmission
Hydralic shift only
❾ Coupler mounts to crankshaft
❶
❺
Low speed / work application
I drive only
❿ Triangular shape coupler
❷
❻
Coupler mounts to flywheel
Round shape coupler
✜ Use with Borg Warner 71/72 series in-line transmission
❸
❼
Use with Hurth transmission
Standard Bravo applications
♣ Use with Borg Warner 5000 or Hurth 630 transmission
❹
❽
720