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Johnson Outboard Cooling System

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Parts Selection Guide

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      • Sierra 18-3392 Water Pump Kit
        List Price: $67.99
        Starting At: $51.49

        Sierra 18-3392 Johnson/Evinrude Water Pump Kit with Housing Sierra replacement engine parts are designed to meet or exceed OEM requirements. Applications: 85 1979-95 90 1979-Up 100 1979-Up 100 Comm. 1984-Up 115 1979-Up 125 ESX 25" 1993-94 125...

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      • Sierra 18-3327 Water Pump Kit Replaces 0394711
        List Price: $46.49
        Starting At: $34.52

        Sierra 18-327 Water Pump Kit for Johnson, Evinrude 9.9 & 15 HP Sierra replacement water pump kit with housing for Johnson/Evinrude Outboards. Sierra replacement engine parts are designed to meet or exceed OEM specifications. Applications: 9.9/15...

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      • Sierra 18-3672 Thermostat Kit
        List Price: $26.49
        Starting At: $15.16

        Sierra 143 Degree Thermostat Kit for Johnson, Evinrude and Mercury Outboards Kit Includes: 18-3553 (Thermostat) 18-0182 (Thermostat Gasket)   Johnson Evinrude Applications: 5 HP 1965-1968, 1986 5.5 HP 1959-1964 6HP 1965-1979, 1986 7.5 HP...

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      • Sierra 18-3382 Water Pump Kit Replaces 0393630
        List Price: $64.99
        Starting At: $38.40

        Water Pump Kit for 20 - 35HP Johnson, Evinrude Applications: 20 HP 1985 & Up 25 HP 1985 & Up 30 HP 1984 & Up 35 HP 1980-1982 Kit Includes: 18-3051 - Impeller 18-3359 - Impeller Plate 18-3367 - Housing 18-3358 - Water Pump Cup 18-0124 -...

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      • Sierra 18-3001 Impeller Replaces 0434424
        List Price: $17.99
        Starting At: $11.93

        Water Pump Impeller for Johnson Evinrude 3 to 7.5 HP Replaces: OMC 0277181, 0434424 GLM 89580 Mallory 9-45216-10,9-45216 Johnson/Evinrude Outboard 434424,277181 Applications: 3 HP 1952-1978 4 HP 1969-1972 4* HP 1973-1983 5 HP 1965-1968 5.5 HP...

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      • Sierra 18-3315-2 Water Pump Kit Replaces 5001595
        List Price: $68.99
        Starting At: $49.92

        Water Pump Kit for Johnson, Evinrude For 90-115SL (1995-up), 120-125ESX (1993-94), 120-130-140-150-175-V-6,V-8 (1993-up). Kit Includes: 18-2557 - Gasket 18-3405 - Housing, WP Replaces: GLM 12000 Johnson/Evinrude Outboard 5001595, 0435929 Mallory ...

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      • Sierra 18-3673 Thermostat Kit
        List Price: $39.49
        Starting At: $27.23

        Sierra Thermostat Kit for Johnson and Evinrude V-4 Crossflow Outboard Engines Kit includes: Thermostats, Gaskets, Springs and Grommets   Applications: 80 HP Jet 1994-1995 85 HP 1978-1980 85 HP 1993-1995 88 HP 1987-1995 90 HP 1983-1995* 90 HP Jet...

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      • Sierra 18-3389 Water Pump Kit Replaces 0432955
        List Price: $77.49
        Starting At: $58.99

        Sierra 18-3389 Water Pump Kit for 60 - 75HP Johnson, Evinrude Sierra high-quality engine parts are designed to meet OEM specifications. For use on Johnson/Evinrude Outboard engines. Applications: 60HP 1986-1994 65HP 1984-1994 70HP...

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      • Sierra 18-3383 Water Pump Kit Replaces 0395270
        List Price: $38.99
        Starting At: $28.15

        Sierra 18-3383 Water Pump Kit for 20 - 28HP Johnson, Evinrude Outboards Sierra replacement water pump kit for Johnson and Evinrude Outboards. Sierra engine parts are engineered to meet today's high horsepower engine demands and stand up in the...

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      • Sierra 18-3674 Thermostat Kit
        List Price: $32.99
        Starting At: $23.38

        Sierra 18-3674 Thermostat Kit for Johnson & Evinrude Engines For Johnson and Evinrude V-6 Crossflow engines. Use With: Thermostat 18-3543 Includes: (1) 18-1219 Grommet Gasket (V6 Crossflow) (1) 18-0182 Thermostat Gasket (1) 18-3135...

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      • Sierra 18-3390 Water Pump Kit Replaces 5001594
        List Price: $67.49
        Starting At: $40.72

        Water Pump kit for Johnson, Evinrude For engines with large gear case (1979 & Up) with 85 HP and up. Does not include housing. Kit Includes: 18-3059 - Impeller 18-2557 - Impeller Gasket 18-3299 - Impeller Key 18-7158 - O-Ring 18-3135 - Stainless...

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      • Sierra 18-3377 Water Pump Kit Replaces 0382468
        List Price: $35.99
        Starting At: $21.13

        Water Pump Kit for 9.9 - 25HP Johnson, Evinrude Applications: 10HP 1949-1957 15,18HP 1953-1965 20HP 1966-1973 25HP 1969-1978   Kit Includes: 18-3002 - Impeller 18-3103 - Impeller Plate 18-3329 - Water Tube Grommet 18-3326 - Pin   Replaces: ...

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      • Sierra 18-3051 Water Pump Impeller Replaces 0395289
        List Price: $20.49
        Starting At: $12.89

        Sierra 18-3051 Water Pump Impeller for Johnson/Evinrude Outboards Sierra high-quality engine parts are designed to meet OEM specifications. Interchangeable with: GLM 89750 Johnson Outboard 395289 Evinrude...

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      • Sierra 18-3059 Water Pump Impeller Replaces 5001593
        List Price: $23.99
        Starting At: $15.95

        Water Pump Impeller for Johnson Evinrude Includes # 18-3299 Impeller Key Replaces: Johnson/Evinrude Outboard 5001593,389289,391538,395864,397131,435821,439948,435748,394534 OMC 395864, 397131, 435821, 435748, 5001593 Mallory 9-45206 GLM 89570 ...

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      • Sierra 18-3050 Water Pump Impeller Replaces 0386084
        List Price: $16.99
        Starting At: $9.78

        Water Pump Impeller for Johnson Evinrude Dimensions: Diameter 1 1/2" Depth 3/4 Impeller has 6 Fins   Replaces: Omc - 0386084 Mallory - 9-45201 Johnson/Evinrude - 386084 Glm - 89770 Redline - RL3050  

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      • Sierra 18-3211 Impeller Kit
        List Price: $47.49
        Starting At: $28.45

        Impeller Repair Kit for Johnson, Evinrude Fits large gearcase outboards 1979 and newer Kit includes Impeller Housing Seal: 18-2536 Impeller Gasket: 18-2557 Impeller (Includes 18-3299 Impeller Key: 18-3059 Impeller Key: 18-3138 Impeller Key: 18-3299...

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      • Sierra 18-3387 Water Pump Kit Replaces 0432955
        List Price: $66.49
        Starting At: $40.45

        Sierra 18-3387 Water Pump Repair Kit for 60 - 75HP Johnson, Evinrude Sierra high-quality engine parts are designed to meet OEM specifications. For use on Johnson/Evinrude Outboards. Kit Includes: (1) 18-2703 Grommet (1) 18-2705 Oil Seal (1)...

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      • Sierra 18-3394 Water Pump Kit Replaces 0438592
        List Price: $67.49
        Starting At: $42.95

        Sierra 18-3394 Water Pump Kit for Johnson/Evinrude Outboard For Use On Engine Models: 35 Jet 1992-93 40 1989-98 40 1999-Up 45/55 Comm. 1985 48 1989-96 50 1989-98 Does not include housing Contains: Oil Seal: 18-2705 Grommet: 18-2708 Wear...

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      • Sierra 18-3543 Thermostat Replaces 5005440
        List Price: $24.49
        Starting At: $14.65

        Sierra 18-3543 Johnson,Evinrude Outboard Engine Thermostat Sierra high-quality engine parts are designed to meet OEM specifications.  Temperature Rating: 143 Interchangeable with: Johnson/Evinrude...

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      • Sierra 18-3083 Impeller Replaces 0777213
        List Price: $25.49
        Starting At: $13.45

        Sierra 18-3083 Water Pump Impeller for Johnson, Evinrude For Use On Engine Models: 40 HP 1960-1970 50 HP 1971-1978 55 HP 1976-1978 Interchangeable with: GLM 89660 Johnson/Evinrude...

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      Johnson Impeller

      Johnson makes some of the finest outboards on the water. However, the “health” of your boat’s power plant should be a primary concern and the part you check most carefully during your post trip maintenance routine. Key to the continued top performance of your outboard is the engine cooling system. Engines rev at high RPM and can overheat if pushed past their limits. Repair or replacement can be costly so keeping your engine’s cooling system working optimally is of primary importance.

      The cooling system on an outboard is a very simple and compact application. Water intake is through the lower unit via water pump impeller. It is then forced upward to circulate throughout the powerhead, and eventually exits through the exhaust system. There are a couple sections of the outboard cooling system that require routine maintenance, so be sure to post-trip check the following.

      Two key parts of your Johnson cooling system that need regular maintenance or could cause problems are the impeller and the thermostat. If your outboard overheats, a faulty impeller is most likely the cause. It is rare that a thermostat fails, but it does happen. If you find that a thermostat is not functioning properly, it must be replaced. Boat thermostats are not like automobile thermostats, which, when they fail, can simply be removed.

      If you find that you need a replacement Johnson impeller, Wholesale Marine is the place to call. And if the thermostat proves to be the culprit, we carry the replacement for that too! Just be sure not to run your boat until this part has been replaced. If an outboard is operated without a thermostat installed, poor performance and internal damage will likely occur.

      An outboard is designed to operate at specific engine temperatures, and if it does not obtain that temperature, it will run very sluggishly. Without temperature control the fuel/oil mix will not burn efficiently, which causes excessive carbon buildup. Carbon buildup in an outboard will cause piston ring problems as the rings will stick inside the piston ring grooves. Once the pistons touch the cylinder wall, immediate scoring will result. Once a piston is scored, it is only a matter of time before the powerhead is completely destroyed unless it is caught in time to perform an overhaul.

      But it doesn’t have to be that way. If it has been determined that your Johnson outboard impeller in your outboard’s water pump requires replacement, this is a task that can be performed in a couple hours by a seasoned DIYer. Here is a brief overview:

      1) Drain oil from the gearbox.

      2) Remove the four nuts from the lower unit. Lift the unit clear and place to the side.

      3) With the pump proper now exposed, slide off the seal, which sits on top of the pump housing.

      4) Unscrew the bolts holding the pump housing in place and remove the pump housing.

      5) Separate the pump housing and move it up the shaft. Be sure to include the bottom plate as well.

      6) The new Johnson impeller can now be removed and replaced with a new Johnson outboard impeller. Note: The new part will have straight vanes. These will develop a set over time and through use.

      7) Parts may now be replaced in reverse order or additional maintenance performed.

      For more detailed instruction, please speak with our staff! Here is some additional advice on how to protect your Johnson outboard impeller by protecting your outboard’s cooling system.

      Simple Steps to Protect Your Engine’s Cooling System

      ● Perform routine maintenance and by being responsive to warning signs such as a sluggish engine.

      ● Be sure to change your water pump without fail EVERY two years regardless of usage.

      ● If you operate your boat in saltwater, you must flush your engine and cooling system after every use.

      Following these simple guidelines will protect your marine engine from serious damage, and the mechanical skills required are fairly minimal. If you should have any questions, feel free to contact us at Wholesale Marine.

      Wholesale Marine wants to be your one-stop shop for boating supplies! Contact us to talk about the cooling system on your Johnson outboard. Our knowledgeable staff shares your passion for life on the water. And our friendly customer service will make you a Wholesale Marine customer for life! We offer same day shipping and our low price guarantee, call today (877) 388-2628.