100Knots

Sierra® Water Pump Repair Kits – Mercury®/Mariner®

Price range: $110.29 through $337.95
SKU: GS18-3406

Description

Restore peak cooling performance to your Mercury® or Mariner® outboard with the Sierra® Water Pump Repair Kit (SKU: GS18-3406). Designed for reliability and precision, this kit is essential for maintaining optimal engine temperature and preventing costly overheating issues on the water. Whether you’re performing regular maintenance or addressing a drop in water pressure, Sierra®’s OEM-quality components ensure your outboard’s water pump system operates smoothly and efficiently.

With coverage for a wide range of Mercury® and Mariner® models—including popular 4-stroke Verado engines from 150HP to 300HP—this kit is engineered to meet or exceed original equipment standards. Boat owners can trust Sierra® for hassle-free installation, long-lasting durability, and peace of mind during every outing.

  • OEM-Quality Components: Manufactured to meet or exceed Mercury®/Mariner® specifications for fit and performance.
  • Comprehensive Coverage: Compatible with 4-stroke Verado 4.8-inch torpedo models (150HP, 175HP, 200HP, 225HP, 250HP, 275HP, 300HP) with serial numbers B227000 & up (see full compatibility chart for details).
  • Complete Kit: Includes all necessary gaskets, seals, and impeller for a thorough water pump rebuild.
  • Prevents Overheating: Restores proper water flow to protect your engine from heat damage and extend its service life.
  • Easy Installation: Designed for straightforward replacement, saving you time and labor costs.

Choose the Sierra® Water Pump Repair Kit for reliable cooling system maintenance and enjoy uninterrupted performance on the water. Protect your investment and keep your outboard running strong—order today!

Additional information

Variation:

S18-3406 – SIERRA MERCURY, S18-3407 – SIERRA MERCURY, S18-3425 – SIERRA W/PUMP MERCURY/MARINER/YAMAHA, S18-3426 – SIERRA W/PUMP MERCURY/YAMAHA, S18-3446 – SIERRA W/PUMP MERCURY/MARINER, S18-3448 – SIERRA W/PUMP MERCURY/MARINER, S18-3507 – SIERRA MERCURY UPPER, S18-3517 – SIERRA MERCURY UPPER, S18-48317 – SIERRA TOHATSU WITH HOUSING F8-F9.8

Dimensions
Weight0.7 kg
Dimensions14 × 13 × 10 cm
Mariner ModelsS/N CodeS/NImpellerPlateImpeller CupImpeller Repair KitComplete Kit
2A646AllS18-3072
2B6A1AllS18-3072
4A6AllS18-3073
5C6000AllS18-3073
6C6H8AllS18-3066
6D6H6AllS18-3066
8A(M)655000000-000300S18-3063
8A(ML)655000000-300101S18-3063
8B(M)677000101 & UpS18-3063
8B(ML)677300101 & UpS18-3063
8C6G1AllS18-3066
9.9C682AllS18-3074S18-3148
15A(M)651000285 & BelowS18-3063
15A(ML)6513000100 & BelowS18-3063
15C684AllS18-3074S18-3148
20C(M)6A9000101-005810S18-3067S18-3436S18-3426
20C(ML)6A9300101-306542S18-3067S18-3436S18-3426
20C(E)6A9250101-250819S18-3067S18-3436S18-3426
20C(EL)6A9550101-550693S18-3067S18-3436S18-3426
20C(M)6A9010112 & UpS18-3067S18-3427
20C(ML)6A9306543 & UpS18-3067S18-3427
20C(E)6A9250820 & UpS18-3067S18-3427
20C(EL)6A9550694 & UpS18-3067S18-3427
25C(M)695000101-014870S18-3067S18-3436S18-3426
25C(ML)695000000-312185S18-3067S18-3436S18-3426
25C(E)695000000-252290S18-3067S18-3436S18-3426
25C(EL)695000000-553575S18-3067S18-3436S18-3426
25C(M)695014871 & UpS18-3067S18-3427
25C(ML)695312186 & UpS18-3067S18-3427
25C(E)695252291 & UpS18-3067S18-3427
25C(EL)695553576 & UpS18-3067S18-3427
28664AllS18-3067
30689AllS18-3067
30A(M)689000366-014805S18-3067S18-3436S18-3426
30A(ML)689301911-315315S18-3067S18-3436S18-3426
30A(E)689100251-103275S18-3067S18-3436S18-3426
30A(EL)689401216-407815S18-3067S18-3436S18-3426
30A(M)689022059 & UpS18-3067S18-3427
30A(ML)689321377 & UpS18-3067S18-3427
30A(E)689105325 & UpS18-3067S18-3427
30A(EL)689411947 & UpS18-3067S18-3427
48/48W670AllS18-3069S18-3436S18-3435S18-3425
55/W55663AllS18-3069S18-3436S18-3435S18-3425
60675,6F0AllS18-3069S18-3436S18-3435S18-3425
<td>
HorsepowerBeginning SerialEnding SerialImpellerImpeller PlateInsert CupUpper HousingBaseImpeller Repair KitThermostatUpper KitComplete Kit
3.3 (with shift)D901217& UPS18-3098
3.53581366202172S18-3012
3.56202173& UPS18-3054
3.65404657& UPS18-3054
3.9 1416550132498135S18-3012S18-3139S18-3239
4  (1 cyl.)24981364107219S18-3039S18-3139
4  (2 cyl.)5589202& UPS18-3054
4  (made in USA)5595532A809600S18-3054S18-3139
4  (made in USA)5595532& UPS18-3039S18-3139S18-3446S18-3239S18-3446
4 (1 cyl.)A809601& UPS18-3098
4.541072205595531S18-3039S18-3139S18-3239S18-3446
4.55595532& UPS18-3054S18-3139
4.55595532& UPS18-3039S18-3139S18-3239S18-3446
5574128786612S18-3012
5 (1 cyl.)A809601& UPS18-3098
5  4-STROKER000001& UPS18-3098
68880051916138S18-3012
619161392193817S18-3039S18-3139S18-3239
6A197112OT800749S18-3062
615824031916138S18-3039
619161392193817S18-3039
621938182529894S18-3039
623856732387383S18-3039
7.525298954131609S18-3039S18-3139
7.541316105226934S18-3039S18-3139S18-3239S18-3446
7.55206550& UPS18-3054
7.55206550& UPS18-3039S18-3139S18-3239S18-3446
8A197112& UPS18-3062
8  (4-stroke Bodensee)G760300& UPS18-3062
110 (9.8)18657792196388S18-3039
110 (9.8)21963893795657S18-3039
110 (9.8)37956584126459S18-3039
110 (9.8) 341264605206549S18-3039S18-3139S18-3239
1105206550& UPS18-3054
9.85206550& UPS18-3039S18-3139S18-3239S18-3553S18-3446
9.9A197112& UPS18-3062
9.9 (4 Stroke)  STANDARD CASEG760300T979999S18-3062
XR10 SeaProD038000& UPS18-3062S18-3549
105000221057993S18-3008
15B292414& UPS18-3062S18-3549
15 SeaProG044365& UPS18-3062
16700000& UPS18-3008
185837437& UPS18-3057
208609701292909S18-3008
2028276776443972S18-3052S18-3252S18-3448
206443973T800749S18-3057S18-3215
2211585461238089S18-3008
25,25XD,25 Sea Pro5705532& UPS18-3057S18-3215
25 (3 cyl.)E268781& UPS18-3057S18-3215
309502501260724S18-3008
3012718841448139S18-3007S18-3107S18-3207S18-3507
30 JetC159200G589999S18-3007S18-3107S18-3115S18-3118S18-3424S18-3207S18-3507S18-3324
30 JetG590000& UPS18-3057
30 (2 cyl)G053314T598999S18-3057
3512172221448139S18-3007
3515711141960826S18-3007S18-3107S18-3207S18-3507
3519608272453068S18-3007S18-3107S18-3207S18-3507
356445653& UPS18-3007S18-3107S18-3115S18-3118S18-3424S18-3207S18-3507S18-3324
409417511224480S18-3008
4012244811476509S18-3007 S18-3007
4028747044362214S18-3007S18-3107S18-3115S18-3118S18-3422S18-3207S18-3507S18-3322
40 (2 cyl) thru 19834860103& UPS18-3057S18-3107S18-3115S18-3118S18-3424S18-3207S18-3507S18-3324
40 (3 cyl)G531301& UPS18-3057S18-3507
40 (4 cyl)C159200& UPS18-3007S18-3107S18-3115S18-3118S18-3424S18-3207
40 (4-stroke) 2:1 ratioG760300T408999S18-3057
40 (EFI 4-stroke) 1.83:1 ratioT409000& UPS18-8900S18-3445
40 (EFI 4-stroke) 2.31:1 ratioT409000B344398S18-3056S18-3214
40 (4-stroke, 4 cyl.) 2.31:1 ratioT228405T598999S18-3056S18-3214
40 (4-stroke,Std)G231123T178499S18-3057
40  4-stroke  Carb   BIG FOOTC033811& UPS18-3056
4012796851476509S18-3007S18-3507
455531630& UPS18-3007S18-3107S18-3115S18-3118S18-3424S18-3207
45 Jet (3 cyl)D000750& UPS18-8900
45 (4-stroke,std) BodenseeG231123& UPS18-3057
45 (4-stroke,bigfoot) BodenseeG231123& UPS18-3056S18-3214
5014211131460498S18-3007S18-3507
5014779101521913S18-3007
5015219142305100S18-3007S18-3107S18-3207S18-3507
50  aluminum w/p23051012478119S18-3007
50  plastic w/p23051012478119S18-3007
50025149194357639S18-3007S18-3107S18-3115S18-3118S18-3422S18-3207S18-3507
50  (4cyl)43576405531629S18-3007S18-3107S18-3115S18-3118S18-3423S18-3207S18-3507
50  (4cyl)5531630& UPS18-3007S18-3118
50 (4 cyl)4962056& UPS18-3007S18-3107S18-3115S18-3118S18-3424S18-3207S18-3507
50 (3 cyl)6428681D000749S18-3007S18-3107S18-3115S18-3118S18-3424S18-3207
50 (3 cyl)D000750G589999S18-8900S18-3445S18-3553
50 (3 cyl)G590000& UPS18-3057
50 (4-stroke,Std)G231123T178499S18-3057
50 (4-stroke, 4 cyl.)  STANDARDT178500T598999S18-8900S18-3445
50 (4-stroke, 4 cyl.) BIG FOOTT178500& UPS18-3056S18-3572S18-3214
50 (EFI 4-stroke) STANDARDT409000B344398S18-8900S18-3445
50 (EFI 4-stroke)  BIG FOOTT409000B344398S18-3056S18-3214
55 (3 cyl)D000750& UPS18-8900S18-3445
606428681D000749S18-3007S18-3107S18-3115S18-3118S18-3424S18-3207S18-3324
60  (3cyl) standardD000750& UPS18-3056S18-3122S18-3214
60 MarathonS18-3122S18-3214
60 Big FootD000750S18-3122S18-3214S18-3553
60 (3 cyl)D000750& UPS18-8900S18-3553
60  4-STROKE  STANDARDOT178500T598999S18-8900S18-3445S18-3214
60  4-STROKE, BIG FOOTOT178500T598999S18-3056S18-3214
60  4-STROKE EFI  BIG FOOTT409000B344398S18-3056
65( 4 cyl)  aluminum w/p1542745280351S18-3017S18-3117S18-3114S18-3217S18-3507
65 (4cyl)  plastic w/p1542745280351S18-3017S18-3116
65  (4cyl)28035622874263S18-3017S18-3116
65  (4cyl)29974393293183S18-3017S18-3116
65(3 cyl)32931844382056S18-3007S18-3107S18-3115S18-3118S18-3422S18-3207S18-3507
65(3 cyl)43820574571651S18-3007S18-3107S18-3115S18-3118S18-3424S18-3207
65 Jet0D283222& UPS18-3056S18-3122S18-3214
7014136111436114S18-3017S18-3117S18-3217S18-3507
70  (6cyl)14822121503458S18-3017
700 E-2  (6cyl)15034591503958S18-3017
700 EL-2  (6cyl)15034591566239S18-3017
700 E-2  (6cyl)  1115039591566239S18-3017S18-3116
700  EL-2  (6cyl) 1115051111566239S18-3017S18-3116
70 (3 cyl)45716524977156S18-3007S18-3107S18-3115S18-3118S18-3423S18-3207S18-3553S18-3507
7049771576428680S18-3007S18-3107S18-3115S18-3118S18-3424S18-3207
70B110054& UPS18-3056S18-3214S18-3517
70  (3cyl)  6A996142C221999S18-3056S18-3572S18-3553
70 (3cyl)  5A996142C221999S18-3056S18-3572S18-3553
75 (4 cyl)6432901& UPS18-3017S18-3117S18-3114S18-3116S18-3414S18-3217
75 (3 cyl)A996142C221999S18-3056S18-3214S18-3553
75 (3 cyl)C222000& UPS18-3056S18-3214S18-3569
75 (3 cyl)C222000& UPS18-3056S18-3122S18-3214S18-3569
75 (3cyl) OptimaxT980000& UPS18-3056S18-3572
75  4-STROKEG960500B366822S18-3056S18-3572S18-3214
75  4-STROKEB366823& UPS18-3056
8013554683493912S18-3017S18-3117S18-3217S18-3517
80  (6cyl)13354651398629S18-3017
80 (4 cyl)48319996432900S18-3017S18-3117S18-3114S18-3116S18-3414S18-3217
80  (3 cyl) 6A996142C221999S18-3056S18-3214S18-3553
80  (3 cyl) 5A996142C221999S18-3056S18-3572S18-3553
80 JetD283222& UPS18-3056S18-3122S18-3214
850 E & EL (6cyl)14609991567039S18-3017S18-3117S18-3217S18-3517
850 E-1, EL-1  (6cyl)  1115662401766823S18-3017
85 ( 4 cyl)4590512& UPS18-3017S18-3117S18-3114S18-3116S18-3414S18-3217
85 XS (4cyl)34939134831998S18-3017S18-3116
850 XS  (4cyl)34939134831998S18-3017S18-3116
850, 850 XS  (4cyl)34939134590511S18-3017S18-3116
900  (90hp)  (6 cyl) 1117668241869775S18-3017S18-3117S18-3217S18-3517
90 (6 cyl)4845301& UPS18-3017S18-3117S18-3114S18-3116S18-3414S18-3217
90 (3 cyl)B110054C221999S18-3056S18-3214
90  (3 cyl)A996142& UPS18-3056S18-3214S18-3553
90  (3 cyl)A996142& UPS18-3056S18-3122S18-3214S18-3553
90  4-STROKEG960500B366822S18-3056S18-3572S18-3214
90  4-STROKEB366823& UPS18-3056S18-3572S18-3214
9518697762318585S18-3017S18-3117S18-3217
115  (3CYL) OptimaxT801000& UPS18-3056S18-3572
950  (95hp)  (6 cyl) 1118697762318585S18-3017
1000(6 cyl)14649491503331S18-3017S18-3117S18-3217
1000 (6cyl)15033322318585S18-3017S18-3116
100 (4 cyl)B209468& UPS18-3056S18-3214S18-3553
100 (4 cyl)B209468& UPS18-3056S18-3122S18-3214S18-3553S18-3517
1000 SS  (6cyl)  123185862413843S18-3017S18-3116
1000 SS  (6cyl) 323185862413843S18-3017S18-3116
1000 SS E-1 124846332836018S18-3017S18-3116
1000 SS E-1 324846332836018S18-3017S18-3116
1000 BP  (6cyl)23996983253111S18-3017N.L.A.
105 Jet0D182000& UPS18-3017S18-3117S18-3114S18-3116S18-3419S18-3217
110 118702042314955S18-3017S18-3117S18-3217
110 318702042314955S18-3017S18-3317
115  (6cyl)28360194112634S18-3017S18-3117S18-3217S18-3517
115  (6cyl)41126354394236S18-3017
115 (6 cyl)4394237& UPS18-3017S18-3117S18-3114S18-3116S18-3414S18-3217
115 ( 4 cyl) 6C100000& UPS18-3056S18-3214S18-3569
115 (4cyl) 5C100000& UPS18-3056S18-3572S18-3569
115 (4 cyl)B209468& UPS18-3056S18-3122S18-3214
115  4-STROKET178500B366822S18-3056S18-3214
115  4-STROKEB366823& UPS18-3056S18-3572
115 (3cyl)  OptimaxT801000& UPS18-3056S18-3572
115 Pro XSB751825& UPS18-3056S18-3572
125  (6cyl)  223149562839368S18-3017S18-3117S18-3217
125 (6cyl) 423149562839368S18-3017
125 (4 cyl) 6D283222& UPS18-3056S18-3569
125 (4cyl) 5D283222& UPS18-3056S18-3572
125  (3cyl)  OptimaxB736885& UPS18-3056S18-3572
13528393693293233S18-3017S18-3117S18-3217S18-3517
V 135904646& UPS18-3017S18-3117S18-3114S18-3116S18-3419S18-3217
135  4-STROKE  VERADOB227000& UPS18-3056S18-3572S18-3407
14032932343502805S18-3017S18-3117S18-3217S18-3517
1404865678& UPS18-3017S18-3117S18-3114S18-3116S18-3414S18-3217S18-3517
140 JetD082000& UPS18-3017S18-3117S18-3114S18-3116S18-3419S18-3217
15035028064121434S18-3017S18-3117S18-3217S18-3517
150 (6cyl) 941214354865677S18-3017S18-3117S18-3114S18-3116S18-3414S18-3217S18-3517
150  (6cyl) 1041214354865677S18-3017S18-3414
1500 XS  (6cyl)48686485327662S18-3017
V 150A904646&  UPS18-3017S18-3117S18-3114S18-3116S18-3419S18-3217S18-3517
V 150A904645& BELOWS18-3017S18-3117S18-3114S18-3116S18-3416S18-3217S18-3517
V-135 DFIG590000& UPS18-3017
V-150 Carb 84868998A904645S18-3017</td>
V-150 Carb 74868998A904645S18-3017
V-150 Carb, EFI, DFIA904646& UPS18-3017
V-150XR2,4,6 – MAGNUM II, III 84868998& UPS18-3017
V150XR2,4,6 – MAGNUM II, III 74868998& UPS18-3017
150  4-STROKE  VERADO  (4cyl)B227000& UPS18-3056S18-3572S18-3406S18-3407
V 1756618751& UPS18-3017S18-3117S18-3114S18-3116S18-3419S18-3217S18-3517
V 17543012356618750S18-3017S18-3117S18-3114S18-3116S18-3416S18-3217S18-3517
V-175 Carb, EFI, DFI6618751& UPS18-3017
175  4-STROKE  VERADO  (4cyl)B227000& UPS18-3056S18-3572S18-3406S18-3407
V 2006625221& UPS18-3017S18-3117S18-3114S18-3116S18-3419S18-3217S18-3517
V-200 848390346625220S18-3017S18-3117S18-3114S18-3116S18-3416S18-3217
V-200 748390346625220S18-3017
V-200 DFI (3.0L)G386496G589999S18-3056S18-3214S18-3517
V-200 EFI (3.0L)T750164B504988S18-3056
V-200 Carb, & EFI (2.5L)6625221& UPS18-3017
V-200 DFI (3.0L)G590000T598999S18-3056S18-3572
V-200 DFI (3.0L)T590000B504988S18-3056S18-3572
V-200 DFI (3.0L)B504989& UPS18-3056S18-3572S18-3407
200  4-STROKE  VERADO  (4cyl)B517159& UPS18-3056S18-3572S18-3406S18-3407
200  4-STROKE   4.8 INCH TORPEDOT980000& UPS18-3056S18-3572S18-3406S18-3407
V 220 LASERB117316& UPS18-3017S18-3117S18-3114S18-3116S18-3419S18-3217S18-3517
V-225  (2.4L) 85628028& UPS18-3017
V-225  (2.4L) 75628028& UPS18-3017
V-225 (3.0L)  CARB & EFID280813G760299S18-3056
V-225 (3.0L)  CARB & EFIG760300T408999S18-3056S18-3571
V-225 (3.0L) EFIT409000B504988S18-3056S18-3571
V-225 DFIG590000T598999S18-3056S18-3571
V-225 DFIT599000B504988S18-3056S18-3571
V-225 DFIB504989& UPS18-3056S18-3571S18-3407
V-225  Pro XSB104549B752546S18-3056S18-3571
V-225 Pro XSB752547& UPS18-3056S18-3571S18-3407
225  4-STROKE  VERADO 4.8 INCH TORPEDOT980000& UPS18-3056S18-3572S18-3407
V-250 (3.0L) EFIG129222T408999S18-3056S18-3571
V-250 (3.0L) EFIT409000B504988S18-3056S18-3572
V-250 DFIB528615& UPS18-3056S18-3572S18-3407
V-250 Pro XSB426561B752546S18-3056S18-3571
V-250 Pro XSB752547& UPS18-3056S18-3572S18-3407
250  4-STROKE  VERADO 4.8 INCH TORPEDOT980000& UPS18-3056S18-3572S18-3407
275  4-STROKE  VERADO 4.8 INCH TORPEDOT980000& UPS18-3056S18-3572S18-3407
300  4-STROKE  VERADO 4.8 INCH TORPEDOB517434& UPS18-3056S18-3572S18-3407
MARK 5574128786612S18-3012
MARK 6, 6A888005& UPS18-3012
MARK 50ALL& UPS18-3007
MARK 55831021& UPS18-3007
MARK 55A1227131& UPS18-3007
MARK 58 E, MARK 58A (M&E)1139538& UPS18-3007
9OG129222& UPS18-3056S18-3117S18-3114S18-3116S18-3419S18-3214S18-3517
XR4/Magnum IIALLS18-3017S18-3217