Mercruiser Engine Couplers

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Liter/ Model # :

Liter/ Model #

Serial #

Engine Coupler

110 1537370-2044030 18-2171
120 1537370-6229717 18-2171
120 (2.5L) 6229718 & UP 18-2171 (1)
120 (2.5L) 6229718 & UP 18-2195 (8)
120 (2.5L) 6229718 & UP 18-2172 (4)
140 2508261-6229717 18-2171
140 (3.0L) 6229718 & UP 18-2171 (1)
140 (3.0L) 6229718 & UP 18-2195 (8)
140 (3.0L) 6229718 & UP 18-2172 (4)
140 (6 Cyl) 1538930-1725960 18-2171
3.0L/3.0LX C856559-F000000 18-2195 (6)
150 1666495-2048046 18-2171
160 2048022-2770031 18-2171
165 (6 Cyl) 2770032 & UP 18-2171
175 (4.3L) B527955 & UP 18-2175 (7)
470 (224 CID) 3.7L 4208730- 6218036 18-2413
485 (224 CID) 3.7L 4208730- 6218036 18-2413
165 3.7L 6170297 & UP 18-2414
170 3.7L 6170297 & UP 18-2414
470 3.7L 6170297 & UP 18-2414
4.3L (Generation II) D714107 & UP 18-2175 (7)
185 (229 CID) 6330183 & UP 18-2171
185 (262 CID) A331455 & UP 18-2171 (1)
185 (262 CID) A331455 & UP 18-2175 (9)
185 (262 CID) A331455 & UP 18-2172 (5)
888 Ford (188 HP) 3108723 & UP 18-2173
190 1564539 -1730903 18-2171
898 (198 HP) 4762210 & UP 18-2171 (1)
898 (198 HP) 4762210 & UP 18-2175 (9)
200 6218462 & UP 18-2171 (1)
200 6218462 & UP 18-2172 (5)
200 6218462 & UP 18-2175 (9)
200 (5.0L) B525982 & UP 18-2175 (7)
205 (262 CID) A331455 & UP 18-2171 (1)
205 (262 CID) A331455 & UP 18-2172 (5)
205 (262 CID) A331455 & UP 18-2175 (9)
205 (4.3L) B5257955 & UP 18-2175 (7)
205 (4.3L) (Generation II) D714370 & UP 18-2175 (7)
225 1539620-2694014 18-2171
225 3385721 & UP 18-2173
225 S Ford 3385721 & UP 18-2173
228 4765100-6218461 18-2171
228 6218462 & UP 18-2171 (1)
228 6218462 & UP 18-2175 (9)
228 6218462 & UP 18-2172 (5)
230 6218462 & UP 18-2171 (1)
230 6218462 & UP 18-2175 (9)
230 6218462 & UP 18-2172 (5)
230 (5.0L) B525982 & UP 18-2175 (7)
233 Ford 4173000 & UP 18-2173
250 4768000-4908849 18-2171
260 4908850-6218461 18-2171
260 6218462 & UP 18-2171 (1)
260 6218462 & UP 18-2175 (9)
260 6218462 & UP 18-2172 (5)
Mercruiser w/ Bravo Drive - 18-2412
260 (5.7L) B5259812 & UP 18-2175 (7)
300 MR 6668677 & UP 18-2171 (3)
300 MR 6668677 & UP 18-2175 (10)
320 EFI A543604 & UP 18-2175 (7)
350 Magnum A635178 & UP 18-2175 (7)
454 Magnum A631894 & UP 18-2175 (7)
5.7L (Bravo) B525982 & UP 18-2175 (7)

Liter/ Model #

Serial #

Engine Coupler

Notes:
  • (1) : Early Models
  • (3) : MR Cast Coupling
  • (4) : MR Stamped Coupling
  • (5) : General Motors has changed the V-6 and V-8 cylinder block and crankshaft to incorporate a one-piece full circle rear seal. For this change to be made, General Motors had to redesign the cylinder block and crankshaft discontinuing the earlier style engines. Mercury has added engine coupler # 14505-A2 (18-2172/AP# 1847) to compensate for this change in design.
  • (6) : For engine coupler w/o yoke use 18-2321
  • (7) : For engine coupler w/o yoke use 18-2323
  • (8) : Late Models, For engine coupler w/o yoke use 18-2321
  • (9) : Late Models, For engine coupler w/o yoke use 18-2323
  • (10) : MR Stamped Coupling, For engine coupler w/o yoke use 18-2323
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Liter/ Model # :
Your Price: $264.87
Save: $136.43
(33% Off $401.30)
Part # 18-2175 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 18643A7
For: Mercruiser Flex plate style, late model, small crankshaft bolt pattern style engines.
Your Price: $306.60
Save: $156.05
(33% Off $462.65)
Part # 18-2195 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 12632A7
For: Mercruiser Flex plate style, GM 4 Cyl Engines with late style, small crankshaft bolt pattern
Your Price: $249.92
Save: $49.89
(16% Off $299.81)
Part # 18-2321 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 12632A6
Same as 18-2195 Without Yoke
For: Mercruiser Flex plate style, GM 4 Cyl Engines with late style, small crankshaft bolt pattern
Your Price: $233.40
Save: $98.61
(29% Off $332.01)
Part # 18-2323 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 18643A5
Same as 18-2175 Without Yoke
For: Mercruiser Flex plate style, late model, small crankshaft bolt pattern style engines.
Engine Coupler Assembly - Sierra
Your Price: $425.00
Save: $141.07
(24% Off $566.07)
Part # 18-2412
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 861523A9
  • MERCURY MARINE 18311A17
For: Mercruiser Bravo Drives
Your Price: $339.94
Save: $204.88
(37% Off $544.82)
Part # 18-2413 ValueShip™ Eligible
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Replaces OEM part #
  • MERCURY MARINE 69354A2
For: Mercruiser 470, 485(224 cu. in.), S/N 4208730-6218036 (1976-1982)
Your Price: $398.99
Save: $163.82
(29% Off $562.81)
Part # 18-2414 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 97432A2
For: Mercruiser 165, 170, 470, 3.7L S/N 6170297 & UP (1983-1989), 180, 190, 488, 3.7LX S/N 6170297 & UP (1983-1989)
Engine Coupler - Sierra
Your Price: $134.99
Save: $99.56
(42% Off $234.55)
Part # 18-2171 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 76850A2
For: All Mercruiser GM Engines, Except MR/ALPHA/BRAVO with "Triangular", 3-Bolt Coupler.
Your Price: $257.95
Save: $150.61
(36% Off $408.56)
Part # 18-2172 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 14505-A2
For: Use when new style block, with small crankshaft end, is replacing a Mercruiser block
Your Price: $282.63
Save: $147.86
(34% Off $430.49)
Part # 18-2173 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 59826A3
For: Mercruiser Ford Engines
Sierra
Full StarFull StarFull StarFull StarFull Star Based On 4 Reviews | Write Review
Full StarFull StarFull StarFull StarFull Starawesome
by Kevin from Spencerport, New York on June 02, 2015
perfect fit now i can keep the coupler and splines greased
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Full StarFull StarFull StarFull StarFull StarPerfect
by Robert from Kimberly, Idaho on July 03, 2014
Excellent product and value. iBoats service is outstanding.
(1 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Starcoupler
by Robert from Kimberly, Idaho on June 12, 2014
Excellent value and service.
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Full StarFull StarFull StarFull StarFull StarCoupler Upgrade
by Robert from Haw River, North Carolina on August 02, 2013
...now I can grease the slip joint without removing the drive....perfect fit,arrived "the" day promised...and we are back on the water !!
(1 of 1 people found this review helpful)
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Average Customer Review for Sierra 18-2414 Engine Coupler Assembly
Full StarFull StarFull StarFull StarEmpty Star Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarEmpty StarCoupler
by William from Erie, Pennsylvania on June 19, 2015
Works great. Perfect match. Had no issues and pricing was right.
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Average Customer Review for Engine Coupler - 18-2171 - Sierra
Full StarFull StarFull StarFull StarFull Star Based On 3 Reviews | Write Review
Full StarFull StarFull StarFull StarFull StarEngine coupler
by Ron from Gardnerville, Nevada on July 08, 2016
Take your time and do your research. Count the splines. The splines seem to be a bit shorter with the counter bored end but it fit great otherwise.
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Full StarFull StarFull StarFull StarFull Starcoupler for 165Mercruiser
by John from Sprjing City, Tennessee on August 06, 2012
Well satisfied with this replacement part.
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Full StarFull StarFull StarFull StarFull Starfirefighter
by Francis from Edwards, Missouri on August 19, 2011
Excellent product, rapid service and receipt of part. Would reccomend you to anyone needing parts or other boat supplies
(1 of 1 people found this review helpful)
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Average Customer Review for Engine Coupler - 18-2173 - Sierra
Full StarFull StarHalf StarEmpty StarEmpty Star Based On 2 Reviews | Write Review
Full StarFull StarFull StarFull StarEmpty StarEngine coupler
by Steven from Bayfield, Wisconsin on July 11, 2015
good price, fast service
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Full StarEmpty StarEmpty StarEmpty StarEmpty StarAlignment flaw in coupler
by Duane from Wolf Creek, Montana on June 17, 2012
I am a 20 year Machinist, Machine Builder. After checking your product I find the coupler flywheel to spline alignment to be 2 to 3 degrees off. Making it impossible for proper spline to gimble bearing alignment. I would like my money back or a good coupler as I know this will build heat and probably fail. Please reply as soon as possible. Sincerely, Duane Fagnan
(1 of 1 people found this review helpful)
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