MerCruiser Cooling System
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
OEM MerCruiser Sea Water Pump Assembly V-Belt 46-807151a12
Mercury Marine / Quicksilver
$573.24 $485.46MerCruiser sea water pump assembly (AKA Raw Water Pump/ Seawater pump) Pulley not included Replacement sea water pump housing 807151A12 is plastic to combat corrosion in saltwater installations. It is for V-6 and V-8 MerCruiser engines made by...- Part Number:
- 710-46-807151A12
- Availability:
- In Stock - Ships same or next business day.
$573.24 $485.46 -
OEM Quicksilver/Mercury Thermostat 140 Degree 8M0089715
Mercury Marine / Quicksilver
$26.58 $22.99OEM Quicksilver/Mercury Thermostat 140 Degree 8M0089715 Thermostat 8M0089715 is for various MerCruiser stern drive applications with standard cooling systems. See your owner's manual or service manual for specific applications and installation...- Part Number:
- 710-8M0089715
- Availability:
- In Stock - Ships same or next business day.
- Temp.:
- 140 Deg -
- Application:
- MerCruiser GM Engines
$26.58 $22.99 -
OEM Quicksilver/Mercury Thermostat Kit- 140 Degree 807252Q 4
Mercury Marine / Quicksilver
$55.00 $46.99OEM Quicksilver/Mercury Thermostat Kit- 140 Degree 807252Q 4 Thermostat 807252Q4 is for V-6 and V-8 MerCruiser engines (except high performance engines) made by General Motors (model year 1983 through 2016) with standard cooling requiring a 140...- Part Number:
- 710-807252Q 4
- Availability:
- In Stock - Ships same or next business day.
- Description:
- GM V-6/V-8 1983 & later w/ Std. Cooling except Hi-Performance models: 140 Deg -
$55.00 $46.99 -
OEM MerCruiser 496 Brass Sea Water Pump With Air Fittings 46-862914T12 46-8M0122658 46-8M0139997
Mercury Marine / Quicksilver
$1,178.79 $1,008.18OEM MerCruiser 496 Brass Sea Water Pump With Air Fittings 46-862914T12 46-8M0122658 New Number 46-8M0139997 Pulley Not IncludedOld Part number 46-862914T12 superseded to new Part Number: 46-8M0122658 Superseded again to 46-8M0139997 Please...- Part Number:
- 710-46-8M0139997
- Availability:
- In Stock - Ships same or next business day.
$1,178.79 $1,008.18 -
OEM MerCruiser V6/V8 Brass Sea Water Pump With Air Fittings 862914T11 8M0122657 8M0139996
Mercury Marine / Quicksilver
$1,031.36 $884.34OEM MerCruiser V6/V8 Brass Sea Water Pump With Air Fittings 46-862914T11 46-8M0122657 Item Supersession Chain: RowClassPart NumberSS LevelDispDescription 1 46 8M0139996 00 ACT SEA PUMP KIT 2 46 8M0137217 01 SS SEA PUMP...- Part Number:
- 710-46-8M0139996
- Availability:
- In Stock - Ships same or next business day.
$1,031.36 $884.34 -
OEM MerCruiser Therm Cover Gasket Lower 27-53045Q01
Mercury Marine / Quicksilver
$5.50 $4.26OEM MerCruiser Therm Cover Gasket Lower 27-53045Q01 The Quicksilver Thermostat Housing Gasket fits MCM/MIE GM V‑8 engines.- Part Number:
- 710-27-53045Q01
- Availability:
- In Stock - Ships same or next business day.
- Description:
- Thermostat housing gasket w/grounding tabs. For MerCruiser GM V-6 & V-8 engines.
$5.50 $4.26 -
OEM Mercury / Quicksilver 496 Sea Water Pump w/o Air Fittings 46-8M0139994
Mercury Marine / Quicksilver
$822.21 $703.86Mercury / Quicksilver SEA PUMP KIT 46-8M0139994- Part Number:
- 710-46-8M0139994
- Availability:
- In Stock - Ships same or next business day.
$822.21 $703.86 -
OEM MerCruiser Seawater Pump Backing plate for pump 8M0139995 8M0180871
Mercury Marine / Quicksilver
$9.99OEM MerCruiser Seawater Pump Backing plate for pump 8M0139995 8M0180871- Part Number:
- 710-8M0180871
- Availability:
- In Stock - Ships same or next business day.
$9.99 -
OEM MerCruiser Thermostat Gasket 27-47510
Mercury Marine / Quicksilver
$3.30 $2.56MerCruiser Thermostat Gasket 27-47510 The Quicksilver Thermosat Gasket fits MCM/MIE GM V-6 & V-8 engines w/older style 2 piece thermostat housing.- Part Number:
- 710-27-47510
- Availability:
- In Stock - Ships same or next business day.
- Description:
- T-Stat Gasket: GM V-6 & V-8 engines w/older style 2-pc thermostat housing.
$3.30 $2.56 -
OEM MerCruiser ExhaustManifold Drain Plug 22-16951Q 1
Mercury Marine / Quicksilver
$30.50 $24.89MerCruiser ExhaustManifold Drain Plug 22-16951Q 1 Engine block or manifold drain plug 16951A1 fits most MerCruiser stern drive or inboard engines blocks and manifolds to make draining cooling water for winterizing or changing anti-freeze easier. Can be...- Part Number:
- 710-22-16951Q 1
- Availability:
- In Stock - Ships same or next business day.
- Replaces:
- OMC 379957 - Volvo 82745-1
$30.50 $24.89 -
OEM Quicksilver/Mercury Water Pump Impeller Kit 47-59362A 4
Mercury Marine / Quicksilver
$61.58 $47.30OEM Quicksilver/Mercury Water Pump Impeller Kit 47-59362A 4 This five-piece kit contains the impeller, face plates and o-ring to replace those parts in MerCruiser Bravo I, II and III drives.- Part Number:
- 710-47-59362A 4
- Availability:
- In Stock - Ships same or next business day.
- Type:
- Impeller Kit
- Application:
- Fits plastic 2 piece body sea water pump
$61.58 $47.30 -
OEM Quicksilver/Mercury Thermostat Kit- 140 Degree 807252Q 3
Mercury Marine / Quicksilver
$34.92 $26.82OEM Quicksilver/Mercury Thermostat Kit- 140 Degree 807252Q 3 Thermostat Kit 807252Q3 is for 1982 and older, V-8 MerCruiser marinized stern drive and inboard engines with standard cooling systems made by Ford Motor Company or General Motors. It is...- Part Number:
- 710-807252Q 3
- Availability:
- In Stock - Ships same or next business day.
- Description:
- GM & Ford V-8's 1982 & older w/ Std. Cooling/Hi-Performance V-8's 1996 & older & closed cooling: 140 Deg -
$34.92 $26.82
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.