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Mercruiser Sterndrive Cooling System

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Products: 1 - 50 of 213
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Thermostat Housing Kit - Mercruiser 861493A3

Thermostat Housing Kit - Mercruiser 861493A3

Mfr. Sierra | Mfr No. 18-1910

Thermostat Housing Kit - Mercruiser 861493A3. Fits: 3.0L GM 1999-Up, S/N 0L340999-Lower
$112.51


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Thermostat Housing Kit - Mercruiser 87290A4

Thermostat Housing Kit - Mercruiser 87290A4

Mfr. Sierra | Mfr No. 18-1989

Replaces: 87290A4, 861006A1
$178.13


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Thermostat Housing, Mercruiser, 18-1994

Thermostat Housing, Mercruiser, 18-1994

Mfr. Sierra | Mfr No. 18-1994

Thermostat Housing, Mercruiser, 18-1994, AP# 5004. Replaces 87290A4...
$141.03


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Thermostat Kit Mercruiser - 18-3651

Thermostat Kit Mercruiser - 18-3651

Mfr. Sierra | Mfr No. 18-3651

Thermostat Kit Mercruiser - 18-3651. For use on Mercruiser Inboard/Outboard cooling systems...
$14.65


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Thermostat Kit Mercruiser - 18-3652

Thermostat Kit Mercruiser - 18-3652

Mfr. Sierra | Mfr No. 18-3652

Thermostat Kit Mercruiser - 18-3652. For use on Mercruiser Inboard/Outboard cooling systems...
$18.54


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Thermostat Kit Mercruiser - 18-3667

Thermostat Kit Mercruiser - 18-3667

Mfr. Sierra | Mfr No. 18-3667

Thermostat Kit Mercruiser - 18-3667. For use on Mercruiser Inboard/Outboard cooling systems...
$16.00


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Thermostat Kit Mercruiser - 18-3668

Thermostat Kit Mercruiser - 18-3668

Mfr. Sierra | Mfr No. 18-3668

Thermostat Kit Mercruiser - 18-3668. For use on Mercruiser Inboard/Outboard cooling systems...
$14.55


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Thermostat Kit - Mercruiser 807252T2, 27-47510, 27-53045-1

Thermostat Kit - Mercruiser 807252T2, 27-47510, 27-53045-1

Mfr. Sierra | Mfr No. 18-3644

Replaces Thermostat 160 Degree F. 807252T2, Cover Gasket 27-47510 & 27-53045-1
$17.72


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Thermostat Kit Mercruiser - 18-3568

Thermostat Kit Mercruiser - 18-3568

Mfr. Sierra | Mfr No. 18-3568

Thermostat Kit Mercruiser - 18-3568. For use on Mercruiser 454, 340HP closed system thermostat kit. Replaces Mercruiser Part # 99155T1...
$15.97


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Thermostat Kit Mercruiser - 18-3650

Thermostat Kit Mercruiser - 18-3650

Mfr. Sierra | Mfr No. 18-3650

Thermostat Kit Mercruiser - 18-3650. For use on Mercruiser Inboard/Outboard cooling systems...
$16.18


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Thermostat Kit, 160 Degree Mercruiser - 18-3648

Thermostat Kit, 160 Degree Mercruiser - 18-3648

Mfr. Sierra | Mfr No. 18-3648

Thermostat Kit, 160 Degree Mercruiser - 18-3648. For use on Mercruiser Inboard/Outboard cooling systems...
$17.63


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Thermostat Kit, Mercruiser, 18-3646

Thermostat Kit, Mercruiser, 18-3646

Mfr. Sierra | Mfr No. 18-3646

Thermostat Kit, Mercruiser, 18-3646, replaces Mercruiser # 807252Q3...
$16.29


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Thermostat Service Kit

Thermostat Service Kit

Mfr. Sierra | Mfr No. 18-1989K

Service Kit for 18-1989 Thermostat Housing
$10.69


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Thermostat, 140 degree, Mercruiser, 18-3550

Thermostat, 140 degree, Mercruiser, 18-3550

Mfr. Sierra | Mfr No. 18-3550

Thermostat, 140 degree, Mercruiser, 18-3550, replacement for Mercruiser Inboard/Outboard #59078...
$17.81


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Thermostat, 160 Degree Mercruiser - 18-3649

Thermostat, 160 Degree Mercruiser - 18-3649

Mfr. Sierra | Mfr No. 18-3649

Replacement Thermostat, 160 Degree Mercruiser - 18-3649...
$20.62


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Thermostat, 160 Degree, Crusader, Mercruiser - 18-3552

Thermostat, 160 Degree, Crusader, Mercruiser - 18-3552

Mfr. Sierra | Mfr No. 18-3552

Thermostat, 160 Degree, Crusader, Mercruiser - 18-3552, 165 - 229 ci, CH190/CH220, 305 ci and CH270, 350 ci and 454 ci...
$13.38


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Thermostat, 160 degree, Mercruiser, 18-3555

Thermostat, 160 degree, Mercruiser, 18-3555

Mfr. Sierra | Mfr No. 18-3555

Thermostat, 160 degree, Mercruiser, 18-3555. Replacement for Mercruiser Inboard/Outboard #99155A1...
$14.31


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Thermostat, Chevrolet, GM, Ford V8's, 142°, 18-3551

Thermostat, Chevrolet, GM, Ford V8's, 142°, 18-3551

Mfr. Sierra | Mfr No. 18-3551

Thermostat, Chrysler, GM, Ford V8's, 142°, 18-3551 for Raw Water cooled engines, Chrysler/Force/US. Marine, Crusader GM models, Pleasurecraft, Ford and Mercruiser Inboard/Outboards...
$10.80


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Thermostat, Mercury / Mariner, 120 F Replaces Mercury #14586

Thermostat, Mercury / Mariner, 120° F Replaces Mercury #14586

Mfr. Sierra | Mfr No. 18-3549

Thermostat, Mercury / Mariner, 120° F. For various Mercury and Mariner outboards. Replaces Mercury #14586...
$19.71


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Thermostat, Volvo, Mercury / Mariner, Johnson / Evinrude, Chrysler / Force / US. Marine, 143, 18-3557

Thermostat, Volvo, Mercury / Mariner, Johnson / Evinrude, Chrysler / Force / US. Marine, 143°, 18-3557

Mfr. Sierra | Mfr No. 18-3557

Thermostat, Mercury / Mariner, Johnson / Evinrude, Chrysler / Force / US. Marine, 143°, 18-3557...
$20.71


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V-8 Thermostat Cover Gasket - Mercruiser - 18-2844

V-8 Thermostat Cover Gasket - Mercruiser - 18-2844

Mfr. Sierra | Mfr No. 18-2844

V-8 Thermostat Cover Gasket - Mercruiser - 18-2844. Replacement for Mercruiser Inboard/Outboard #27-48818-1.
$1.40


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Barr, MerCruiser, Upper Thermostat Housing Assembly

Barr, MerCruiser, Upper Thermostat Housing Assembly

Mfr. Barr Marine by EDM

Barr, MerCruiser, Upper Thermostat Housing Assembly. Models 225 (GM), 260, 228, 898/198...
$33.10 - $37.24

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Mercruiser Lower Thermostat Housing, MC-29-87290

Mercruiser Lower Thermostat Housing, MC-29-87290

Mfr. Barr Marine by EDM | Mfr No. MC-29-87290

Mercruiser Lower Thermostat Housing, MC-29-87290, Replaces Mercruiser 87290A4...
$172.54


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Mercruiser Thermostat Housing Cover

Mercruiser Thermostat Housing Cover

Mfr. Barr Marine by EDM | Mfr No. MC-29-47442

Mercruiser Thermostat Housing Cover with off set bolt pattern...
$33.00


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Thermostat Housing, Small Block Chevrolet V6 & V8, CHV-29-80

Thermostat Housing, Small Block Chevrolet V6 & V8, CHV-29-80

Mfr. Barr Marine by EDM | Mfr No. CHV-29-80

Thermostat Housing, Small Block Chevrolet V6 & V8, CHV-29-80 for dual pump cooling system...
$122.57


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Mercruiser Thermostat Housing Sleeve, 23-806922

Mercruiser Thermostat Housing Sleeve, 23-806922

Mfr. Quicksilver by Mercury | Mfr No. 806922

Mercruiser Thermostat Housing Sleeve, 23-806922...
$15.94


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Thermostat Housing Replaces: 47441A1

Thermostat Housing Replaces: 47441A1

Mfr. Sierra | Mfr No. 18-1977-1

Fits 225, GM 260, 228, 898/198, 185R, 898R, 228R, 2GR
$34.37


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Mercruiser Thermostat Housing Replaces: 860256A4

Mercruiser Thermostat Housing Replaces: 860256A4

Mfr. Sierra | Mfr No. 18-3530-1

For: GM V6 and V8 (305 & 350 ci)
$324.54


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Thermostat Housing - Mercruiser 90736A18

Thermostat Housing - Mercruiser 90736A18

Mfr. Sierra | Mfr No. 18-3678

Thermostat Housing - Mercruiser 90736A18Lifetime warranty on Sierra Thermostat Housings and other Sierra Engine Parts...
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Thermostat Housing - Mercruiser 861188A1

Thermostat Housing - Mercruiser 861188A1

Mfr. Sierra | Mfr No. 18-3531

Thermostat Housing - Mercruiser 861188A1. Lifetime warranty on Sierra Thermostat Housings and other Sierra Engine Parts...
$279.23


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Mercruiser - Direct Replacement Heat Exchangers & Oil Coolers

Mercruiser - Direct Replacement Heat Exchangers & Oil Coolers

Mfr. Seakamp Engineering

Mercruiser direct replacement heat exchanger allows use of hot water cabin heater in cooler climates...
$112.10 - $1,168.09

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Water Pump Upper Housing Repair Kit - 817275Q 4

Water Pump Upper Housing Repair Kit - 817275Q 4

Mfr. Quicksilver by Mercury | Mfr No. 817275Q4

Water Pump Upper Housing Repair Kit - 817275Q 4. Fits Alpha One - Gen II...
$130.54


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Water Pump Upper Housing Repair Kit, Mercury / Mariner, Mercruiser, 46-96148A 8

Water Pump Upper Housing Repair Kit, Mercury / Mariner, Mercruiser, 46-96148A 8

Mfr. Quicksilver by Mercury | Mfr No. 96148A8

Water Pump Upper Housing Repair Kit, Mercury / Mariner, Mercruiser, 46-96148A 8. Fits Mercury/Mariner 65 hp (4 cylinder) Through V-6 outboards with short-vane impellers and fits MerCruiser...
$45.68


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Complete Pump Housing Kit Mercruiser - 18-3320

Complete Pump Housing Kit Mercruiser - 18-3320

Mfr. Sierra | Mfr No. 18-3320

Complete Pump Housing Kit Mercruiser - 18-3320. For Mercruiser Inboard/Outboard #1 Units thru S/N D494568.
$32.56


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Complete Pump Housing Kit Mercruiser - 18-3321

Complete Pump Housing Kit Mercruiser - 18-3321

Mfr. Sierra | Mfr No. 18-3321

Complete Pump Housing Kit Mercruiser - 18-3321. For Mercruiser Inboard/Outboard cooling system...
$60.50


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Complete Water Pump Housing Kit For Mercruiser, 18-3317

Complete Water Pump Housing Kit For Mercruiser, 18-3317

Mfr. Sierra | Mfr No. 18-3317

Complete Water Pump Housing Kit For Mercruiser, 18-3317. Complete kit contents listed...
$35.16


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Mercruiser Water Pump Kit, Fits All Bravo Engines Replaces: 47-59362Q08

Mercruiser Water Pump Kit, Fits All Bravo Engines Replaces: 47-59362Q08

Mfr. Sierra | Mfr No. 18-3318

Mercruiser Water Pump Kit, Fits All Bravo Engines Replaces: 47-59362Q08. Mercruiser Water Pump Kit- Fits All Bravo (2 Piece Body)...
$58.15


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Upper Pump Housing Unit w/o Base-Mercury / Mariner, 18-3517

Upper Pump Housing Unit w/o Base-Mercury / Mariner, 18-3517

Mfr. Sierra | Mfr No. 18-3517

Mercury/Mariner Outboard #46-60367A1, 46-96148A5. Merc Sterndrive: 32437A1,32437A3, 37433A1, 42579A4, 44292A4, 48747A3,57234A3, 58618A4,60367A1...
$25.09


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Mercruiser Water Pump Kit

Mercruiser Water Pump Kit

Mfr. Sierra | Mfr No. 18-3147

Mercruiser Water Pump Kit Replaces: 817275T4. For: Gen II-lower s/n D469859 and up...
$93.62


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Water Pump Kit, Mercruiser - 18-3309

Water Pump Kit, Mercruiser - 18-3309

Mfr. Sierra | Mfr No. 18-3309

Water Pump Kit, Mercruiser - 18-3309. Fits MerCruiser engines with a plastic 2-piece body seawater pump...
$24.40


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Water Pump Kit, Mercruiser - 18-3150

Water Pump Kit, Mercruiser - 18-3150

Mfr. Sierra | Mfr No. 18-3150

Water Pump Kit, Mercruiser - 18-3150. Replacement for Mercruiser Inboard/Outboard #46-807151A14. For Bravo cooling systems...
$61.08


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Bi-Directional Water Pump,GM Big Block, WP 1900

Bi-Directional Water Pump,GM Big Block, WP 1900

Mfr. API Marine | Mfr No. WP1900

API New Bi-Directional Water Pump,GM Big Block, WP 1900...
$143.48


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Water Pump, GM 8.1L Engines, WP 2000

Water Pump, GM 8.1L Engines, WP 2000

Mfr. API Marine | Mfr No. WP2000

API New Water Pump, GM 8.1L Engines, WP 2000...
$167.61


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Mercruiser Thermostat Housing Assembly, Ford V8, Upper & Lower

Mercruiser Thermostat Housing Assembly, Ford V8, Upper & Lower

Mfr. Barr Marine by EDM

Mercruiser Thermostat Housing Assembly, Ford V8, Upper & Lower...
$56.69 - $152.73

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Jabsco, Engine Cooling, 1-1/4" Water Pump, Bracket Mount, 43210 Series

Jabsco, Engine Cooling, 1-1/4" Water Pump, Bracket Mount, 43210 Series

Mfr. Jabsco Marine | Mfr No. 43210-0001

Jabsco, Engine Cooling, 1-1/4" Water Pump, Bracket Mount, 43210 Series. Flow rate: Nominal 20 US gallons/min (27 Litres/min) at 1500 rpm...
$556.09


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Thermostat Gasket, 41812

Thermostat Gasket, 41812

Mfr. Osco Motors | Mfr No. 41812

Thermostat Gasket, 41812. Gasket for top cover to base for center riser style manifolds. Replaces Mercruiser # 27-41812...
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Thermostat Gasket, 47510

Thermostat Gasket, 47510

Mfr. Osco Motors | Mfr No. 47510

Thermostat Gasket, 47510. Gasket for sleeve to thermostat element application. Replaces Mercruiser # 27-47510...
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Thermostat Gasket, 48818

Thermostat Gasket, 48818

Mfr. Osco Motors | Mfr No. 48818

Thermostat Gasket, 48818...
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Thermostat Housing Base, Chevrolet Small Block V8, MC553-SB

Thermostat Housing Base, Chevrolet Small Block V8, MC553-SB

Mfr. Osco Motors | Mfr No. MC553-SB

Thermostat Housing Base, Chevrolet Small Block V8, MC553-SB, replaces Mercruiser # 78984...
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Thermostat Top Cover, MC55-TBB

Thermostat Top Cover, MC55-TBB

Mfr. Osco Motors | Mfr No. MC55-TBB

Thermostat Top Cover, MC55-TBB, replaces Mercruiser # 47442...
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Products: 1 - 50 of 213
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Post a question or comment about Mercruiser Sterndrive Cooling System to our online boating community.
Question
For a Merc 120 1967 model----Which way is "up" for the thermostat

For a Merc 120 1967 model—-Which way is "up" for the thermostat. It appears it could go either way. Anyway it is overheating with a 140 degree stst.

Submitted by: Phil
Answer

The end with the spring goes in towards the engine. Have you changed the water pump impeller?


 
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