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MerCruiser Cooling System

MerCruiser Cooling System

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  • OEM MerCruiser 4.3/5.0/5.7 V6/V8 Brass Sea Water Pump  862914T3 862914T10 8M0118067 8M0137216 8M0122655 8M0139995

    OEM MerCruiser 4.3/5.0/5.7 V6/V8 Brass Sea Water Pump 862914T3 862914T10 8M0118067 8M0137216 8M0122655 8M0139995

    Mercury Marine / Quicksilver

    $601.42 $547.14
    NEW OEM Factory MerCruiser  BRASS sea water pump assy WITHOUT Air Fittings (AKA Raw Water Pump/ Seawater pump) Casting number on this pump housing is 8629140 and the casting number on the back nipple plate is 862776c and is removable if yours...
    Part Number:
    710-46-8M0139995
    Availability:
    In Stock - Ships same or next business day.
    $601.42 $547.14
    Qty in Cart: 0
    Quantity:
    Price:
    $601.42 $547.14
    Earn $16.41 in PBS Store Credit
    Subtotal:
  • OEM Quicksilver/Mercury Small Block 5.0 5.7 6.2 350 377  Circulating Pump  46-8M0113734

    OEM Quicksilver/Mercury Small Block 5.0 5.7 6.2 350 377 Circulating Pump 46-8M0113734

    Mercury Marine / Quicksilver

    $166.58 $142.99
    OEM Quicksilver/Mercury Small Block Circulating Pump 46-8M0113734 Replacement water pump with housing 8M0113734 is for V-6 (serial number 1A603239 and below) and V-8 (305, 350 and 377 cid) MerCruiser engines made by General Motors. See your owner's...
    Part Number:
    710-46-8M0113734
    Availability:
    In Stock - Ships same or next business day.
    Application:
    GM V-6(s/n 1A063239 & below) & V-8 (350 & 377 cid) engines
    $166.58 $142.99
    Qty in Cart: 0
    Quantity:
    Price:
    $166.58 $142.99
    Earn $4.29 in PBS Store Credit
    Subtotal:
  • OEM MerCruiser Thermostat Housing Gasket 27-530451

    Mercury Marine / Quicksilver

    $5.50 $4.26
    MerCruiser Thermostat Housing Gasket 27-530451 Thermostat Housing Gasket 530451 is for use on V-6 and V-8 MerCruiser stern drive and inboard engines made by General Motors. It can also be used on Outboard Marine Corporation and Volvo Penta North America...
    Part Number:
    710-27-53045 1
    Availability:
    In Stock - Ships same or next business day.
    Description:
    T-Stat housing gasket w/grounding tabs Repl OEM No. Marine Pwr# 0505-027 MC# 3852111 Volvo# 3852111-8
    $5.50 $4.26
    Qty in Cart: 0
    Quantity:
    Price:
    $5.50 $4.26
    Earn $0.13 in PBS Store Credit
    Subtotal:
  • OEM MerCruiser Blue Plastic Drain and O-Ring 806608A02 22-806608Q01

    OEM MerCruiser Blue Plastic Drain and O-Ring 806608A02 22-806608Q01

    Mercury Marine / Quicksilver

    $9.50 $7.36
    MerCruiser Blue Plastic Drain and O-Ring 22-806608Q01 806608A02 The Quicksilver plastic blue Drain Plug Kit fits MerCruiser cylinder blocks and exhaust manifolds
    Part Number:
    710-22-806608Q01
    Availability:
    In Stock - Ships same or next business day.
    $9.50 $7.36
    Qty in Cart: 0
    Quantity:
    Price:
    $9.50 $7.36
    Earn $0.22 in PBS Store Credit
    Subtotal:
  • OEM Mercury MerCruiser Water Pump Drive Shaft Kit 8M0140001

    OEM Mercury MerCruiser Water Pump Drive Shaft Kit 8M0140001

    Mercury Marine / Quicksilver

    $122.67 $91.26
    Mercury / Quicksilver IMPLLR DRVSHFT KT 8M0140001
    Part Number:
    710-8M0140001
    Availability:
    In Stock - Ships same or next business day.
    $122.67 $91.26
    Qty in Cart: 0
    Quantity:
    Price:
    $122.67 $91.26
    Earn $2.74 in PBS Store Credit
    Subtotal:
  • OEM Quicksilver/Mercury Thermostat Kit- 160 Degree  807252Q 5

    OEM Quicksilver/Mercury Thermostat Kit- 160 Degree 807252Q 5

    Mercury Marine / Quicksilver

    $44.92 $38.49
    OEM Quicksilver/Mercury Thermostat Kit- 160 Degree  807252Q 5 Thermostat 807252Q5 is for V-6 and V-8 MerCruiser engines (except high performance engines) made by General Motors (model year 1987 through 2016) with standard cooling requiring a 160...
    Part Number:
    710-807252Q 5
    Availability:
    In Stock - Ships same or next business day.
    Description:
    GM engines '87 & later w/ Std. Cooling requiring a 160 Deg - thermostat
    $44.92 $38.49
    Qty in Cart: 0
    Quantity:
    Price:
    $44.92 $38.49
    Earn $1.15 in PBS Store Credit
    Subtotal:
  • OEM Quicksilver/Mercury Thermostat-160 Degree  8M0109441

    OEM Quicksilver/Mercury Thermostat-160 Degree 8M0109441

    Mercury Marine / Quicksilver

    $33.00 $28.49
    Thermostat 8M0109441: Is for MerCruiser engines made by General Motors with standard cooling systems requiring the use of the 160 degree (F) thermostat. Easy to replace with common tools. See your owner's manual for removal of non-functioning...
    Part Number:
    710-8M0109441
    Availability:
    In Stock - Ships same or next business day.
    Temp.:
    160 Deg -
    Application:
    1987 & newer GM engines w/standard cooling requiring 160 Deg - thermostat
    $33.00 $28.49
    Qty in Cart: 0
    Quantity:
    Price:
    $33.00 $28.49
    Earn $0.85 in PBS Store Credit
    Subtotal:
  • OEM MerCruiser Sea Water Pump Assembly -With Serpentine Pulley 46-807151A9

    OEM MerCruiser Sea Water Pump Assembly -With Serpentine Pulley 46-807151A9

    Mercury Marine / Quicksilver

    $570.79
    Replacement sea water pump housing 807151A9 is plastic to combat corrosion in saltwater installations. It is for V-6 and V-8 MerCruiser engines made by General Motors with a serpentine belt pulley system for engine accessories and electrical fuel pumps...
    Part Number:
    710-46-807151A 9
    Availability:
    In Stock - Ships same or next business day.
    $570.79
    Qty in Cart: 0
    Quantity:
    Price:
    $570.79
    Earn $17.12 in PBS Store Credit
    Subtotal:
  • OEM Quicksilver/Mercury Big Block 454 502 7.4 Circulating Pump  46-8M0113735

    OEM Quicksilver/Mercury Big Block 454 502 7.4 Circulating Pump 46-8M0113735

    Mercury Marine / Quicksilver

    $266.58 $228.49
    OEM Quicksilver/Mercury Big Block Circulating Pump  46-8M0113735 Replacement bi-directional water pump with housing 8M0113735 is for V-8 (454 and 502 cid) MerCruiser engines made by General Motors. See your owner's manual or service manual for...
    Part Number:
    710-46-8M0113735
    Availability:
    In Stock - Ships same or next business day.
    Application:
    GM V-8 (454 & 502 cid) engines
    $266.58 $228.49
    Qty in Cart: 0
    Quantity:
    Price:
    $266.58 $228.49
    Earn $6.85 in PBS Store Credit
    Subtotal:
  • OEM Quicksilver/Mercury 4-Cycle In-Line Circulating Pump  46-8M0113733

    OEM Quicksilver/Mercury 4-Cycle In-Line Circulating Pump 46-8M0113733

    Mercury Marine / Quicksilver

    $149.92 $125.18
    OEM Quicksilver/Mercury 4-Cycle In-Line Circulating Pump 46-8M0113733 Please confirm fitment of MerCruiser parts with your serial numberPhotos and descriptions provided via Mercury may not always be accurateAll of our Mercury parts are sold and priced...
    Part Number:
    710-46-8M0113733
    Availability:
    In Stock - Ships same or next business day.
    Application:
    GM 4 cyl. & in-line 6 cyl.
    $149.92 $125.18
    Qty in Cart: 0
    Quantity:
    Price:
    $149.92 $125.18
    Earn $3.76 in PBS Store Credit
    Subtotal:
  • OEM MerCruiser Bravo V8 454/502 Sea Water Pump With Pulley 46-807151A8

    OEM MerCruiser Bravo V8 454/502 Sea Water Pump With Pulley 46-807151A8

    Mercury Marine / Quicksilver

    $993.64 $993.49
    OEM MerCruiser Bravo V8 454/502 Sea Water Pump With Pulley 46-807151A8 (AKA Raw Water Pump/ Seawater pump) Pulley includedFits 454 502 1992 - 1999 with the mount for the fuel pumpAlternate 46-807151a 8 Replacement sea water pump housing 807151A8 is...
    Part Number:
    710-46-807151A 8
    Availability:
    In Stock - Ships same or next business day.
    $993.64 $993.49
    Qty in Cart: 0
    Quantity:
    Price:
    $993.64 $993.49
    Earn $29.80 in PBS Store Credit
    Subtotal:
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Cooling System

The Mercruiser cooling system works by circulating cold water around the engine block to cool your MerCruiser engine parts. There are two types of cooling systems; raw water cooling and closed cooling systems. The MerCruiser raw water cooling system functions by drawing water from the lake or sea and carrying it through the engine block to the exhaust system. A closed cooling system employs a heat exchanger, which uses raw seawater to cool hot distilled water. The cooled distilled water runs through the engine block and cools the engine instead of the raw seawater.

The closed cooling system is kinder to the water distribution system than the the raw water cooling system because it is less prone to rusting. A raw water cooling system has a shorter lifespan than a closed cooling system. A fresh water cooling system Mercruiser allows your engine to run at higher temperatures, resulting in a better functioning fuel system.

7.4 Mercruiser cooling system

The thermostat is a small but essential cooling system component that is often overlooked. The thermostat valve regulates the engine's temperature by closing or opening its valve. The valve closes to increase engine temperature by preventing cooling water from passing through the engine block. Once the temperature is high enough, the valve opens to allow cooling water to pass around the heat exchanger and circulating pump to cool the engine. You can refer to the 7.4 Mercruiser cooling system diagram to better understand how the entire system works.

NuWave Marine recommends regular inspection of your cooling system, from the seawater strainer, raw water pump, heat exchanger hoes, and thermostat housing to the circulating water pump. A faulty thermostat will either fail to open or close. If the thermostat valve remains closed, the engine will overheat and cause damage to the ignition system. We recommend replacing the thermostat every two years and installing an electric overheat horn to prevent overheating damages.

Cooling System Replacement Parts You Can Depend On

NuWave Marine has provided boat owners and marine mechanics with quality OEM and aftermarket replacement parts for four decades. We believe in investing in premium replacement parts like exhaust manifold kits, serpentine belts, and circulating pumps for peak marine engine performance. 

Contact us today and our experienced team of marine mechanics will help you find the right replacement parts for your boat's engine.