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MERCURY/MARINER
Cooling System
MERCURY COOLING SYSTEM APPLICATION
Impeller
Beginning
Ending
Impeller
Insert
Upper
Repair
Upper Complete
HP
Serial #
Serial #
Impeller
Plate
Cup
Housing
Base
Kit
Kit
Kit
40
941751
1224480
18-3008
--
--
--
--
--
--
--
40
1224481
1476509
18-3007
--
--
--
--
--
--
--
40
2874704
4362214
18-3007
18-3107
18-3115
18-3118
18-3422
18-3207
18-3507
18-3322
40
4362215
4860102
18-3007
18-3107
18-3115
18-3118
18-3423
18-3207
18-3507
18-3323
40 (2 cyl)
4860103
6445653
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
40 (2 cyl)
G053314
& UP
18-3057
--
--
--
--
--
--
--
40 (3 cyl)
G531301
& UP
18-3057
--
--
--
--
--
--
--
40 (4 cyl)
C159200
& UP
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
40 (4-stroke,Std)
G231123
G760299
18-3057
--
--
--
--
--
--
--
40 (4-stroke) 2:1 ratio
G760300
T408999
18-3057
--
--
--
--
--
--
--
40 (4-stroke, 4 cyl.) 1.83:1 ratio
T228405
& UP
18-8900
--
--
--
18-3445
--
--
--
40 (4-stroke, 4 cyl.) 2.31:1 ratio
T228405
& UP
18-3056
--
--
--
--
18-3214
--
--
40 (EFI 4-stroke) 1.83:1 ratio
T409000
& UP
18-8900
--
--
--
18-3445
--
--
--
40 (EFI 4-stroke) 2.31:1 ratio
T409000
& UP
18-3056
--
--
--
--
18-3214
--
--
40 (4-stroke,Bigfoot)& 2.31: ratio
G231123
& UP
18-3056
--
--
--
--
18-3214
--
--
45
1279685
1476509
18-3007
--
--
--
--
--
--
--
45
5531630
& UP
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
45 Jet (3 cyl)
D000750
& UP
18-8900
--
--
--
--
--
--
--
45 (4-stroke,std) Bodensee
G231123
& UP
18-3057
--
--
--
--
--
--
--
45 (4-stroke,bigfoot) Bodensee
G231123
& UP
18-3056
--
--
--
--
18-3214
--
--
50
1421113
1521913
18-3007
--
--
--
--
--
--
--
50
1521914
2514918
18-3007
18-3107
--
--
--
18-3207
18-3507
--
50
2514919
4357639
18-3007
18-3107
18-3115
18-3118
18-3422
18-3207
18-3507
18-3322
50
4357640
4962055
18-3007
18-3107
18-3115
18-3118
18-3423
18-3207
18-3507
18-3323
50 (4 cyl)
4962056
& UP
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
50 (3 cyl)
6428681
D000749
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
50 (3 cyl)
D000750
G589999
18-8900
--
--
--
18-3445
--
--
--
50 (3 cyl)
G590000
& UP
18-3057
--
--
--
--
--
--
--
50 (4-stroke,Std)
G231123
& UP
18-3057
--
--
--
--
--
--
--
50 (4-stroke, 4 cyl.) 1.83:1 ratio
T178500
& UP
18-8900
--
--
--
18-3445
--
--
--
50 (4-stroke, 4 cyl.) 2.31:1 ratio
T178500
& UP
18-3056
--
--
--
--
18-3214
--
--
50 (EFI 4-stroke) 1.83:1 ratio
T409000
& UP
18-8900
--
--
--
18-3445
--
--
--
50 (EFI 4-stroke) 2.31:1 ratio
T409000
& UP
18-3056
--
--
--
--
18-3214
--
--
50 (4-stroke,Bigfoot)
G231123
& UP
18-3056
--
--
--
--
18-3214
--
--
55 (3 cyl)
D000750
& UP
18-8900
--
--
--
18-3445
--
--
--
60
6428681
D000749
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
60 Seapro
D000750
& UP
18-3056
18-3122
--
--
--
18-3214
--
--
60 Marathon
D000750
& UP
18-3056
18-3122
--
--
--
18-3214
--
--
60 Big Foot
D000750
& UP
18-3056
18-3122
--
--
--
18-3214
--
--
60 (3 cyl)
D000750
& UP
18-8900
--
--
--
--
--
--
--
60 (4 stroke, std.)
OT178500
& UP
18-8900
--
--
--
18-3445
18-3214
--
--
60 (4 stroke, Bigfoot)
OT178500
& UP
18-3056
--
--
--
--
18-3214
--
--
65( 4 cyl)
1542745
3293183
18-3017
18-3117
18-3114
--
--
18-3217
--
--
65(3 cyl)
3293184
4382056
18-3007
18-3107
18-3115
18-3118
18-3422
18-3207
18-3507
18-3322
65(3 cyl)
4382057
4571651
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
65 Jet
0D283222
& UP
18-3056
18-3122
--
--
--
18-3214
--
--
70
1413611
1566239
18-3017
18-3117
--
--
--
18-3217
--
--
70 (3 cyl)
4571652
4977156
18-3007
18-3107
18-3115
18-3118
18-3423
18-3207
18-3507
18-3323
70
4977157
B110053
18-3007
18-3107
18-3115
18-3118
18-3424
18-3207
18-3507
18-3324
70
B110054
& UP
18-3056
--
--
--
--
18-3214
--
--
75 (4 cyl)
6432901
& UP
18-3017
18-3117
18-3114
18-3116
18-3414
18-3217
18-3517
18-3314
For S/N 5206550 and UP .456 I.D. Only
 .438 I.D. Only
.456 I.D. Only
Models with insulator on water pump housing bolts
Models without insulator on water pump housing bolts
317