1975 johnson 70 hp impeller replacement

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1975 johnson 70 hp impeller replacement

Water Pump Impeller for Johnson Evinrude 3 to 7. Sierra engine parts are engineered to meet today's high horsepower engine demands and stand up in the Water Pump Kit for 9. Sierra Water Pump Impeller for Johnson Evinrude Sierra replacement engine parts are high-quality OEM replacements crafted to meet the requirements of specific engines.

Includes Wedge Key. Interchangeable with: GLM Johnson Sierra Water Pump Repair Kit for 9. Fits: 9. Sierra Poppet Relief Valve Sierra high-quality replacement poppet relief valve. Johnson makes some of the finest outboards on the water. 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.

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.

1975 johnson 70 hp impeller replacement

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.Forums New posts Search forums. What's new New posts New media New resources Latest activity.

Media New media New comments Search media. Resources Latest reviews Search resources. Members Current visitors. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter Paddy60 Start date Apr 16, Paddy60 Seaman Apprentice. Joined Jun 15, Messages Good day. I have the lower unit off and every thing looks good but will be changing out all the water pump parts I can.

I did have some observations though. When I removed the pump housing and the base plate, there were no paper gaskets. When I ordered parts there were paper gaskets available so I ordered them i any case. Should I re-assemble with or with out the new gaskets? Just height issue.

1975 johnson 70 hp impeller replacement

Looking closely at the joint of the lower unit, at the front, there is a notch open the the water. So by looks of it, it's a flooded area. On top of the lower unit next to the water pumpthere is a boot around the shift rod but does not look like it would be that that effective of keeping out water from making it down to the lower unit.Changing the impeller on a Johnson 70 hp outboard motor requires pulling the power head and disconnecting the engine.

Once this is done, an open end wrench can be used to first loosen the fitting before removal. The dry weight of a 70hp Johnson outboard is to lbs. Depending on the year model, a 15 hp Johnson outboard is listed as having a dry weight of 70 - 85 lbs. A model, 70 hp Johnson outboard requires a ratio, one pint of 2 cycle oil, to six gallons of fuel.

The dry weight of an model, 70hp Johnson outboard, with tilt and trim, is lbs.

Johnson/Evinrude water pump kits, Impellers, cooling, gearcase seal kits

For a comprehensive answer to this go to marinedoctor. The model, 70 hp Johnson outboard, requires a ratio, one pint of 2 cycle oil, to six gallons of fuel. The water pump on an outboard motor is located low down on the skeg. To replace it, you have to remove the lower unit. The impeller water pump is a housing attached to the upper unit, surrounding the shaft. It must be replaced exactly right, so obtaining a proper servicing manual is strongly recommended.

Powershift II, as advertised on the early 80 model Johnson outboard, was in reference to a revision made to the shift operation of these models. A 70 hp Mercury outboard, serial number OC, would be a year model.

I've had a few 70's engines and that was hte ratio for all of them.

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The listed dry weight for a model, 70 hp Mercury outboard is lbs. Asked By Curt Eichmann. Asked By Leland Grant. Asked By Veronica Wilkinson. Asked By Daija Kreiger. Asked By Danika Abbott. Asked By Consuelo Hauck. Asked By Roslyn Walter.

All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Ask Login. Boats and Watercraft. Watercraft Engine Maintenance. Asked by Wiki User. Top Answer. Wiki User Answered Related Questions. How much does a 70 hp Johnson outboard motor weigh?If the time has come to replace your boat's water pump, you might want to know how to install a new one on your own.

A few different Johnson water pumps run with 50 horsepower, including the, and models, as well as some of the three-cylinder models. Brenna Swanston is a freelance writer, editor and journalist.

She covers topics including environment, agriculture and travel. She previously reported for the Sun newspaper in Santa Maria, Calif. Swanston is an avid traveler and loves jazz, yoga and craft beer. Before you can start the installation process, you've got to remove the defunct water pump. Remove the Johnson lower unit from the boat. Remove the water pump's mounting bolts.

Wiring diagram eia or tia 568 a and b diagram base website and

Remove the O-ring from the drive shaft. Remove the water pump case.

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Check for sand, dirt and debris in the power head, and flush it out if necessary. Use a screwdriver to remove the impeller. Note the position of the plastic key, then remove and replace it. Clean the water pump key area. Use an emery cloth to clean up the shaft, if necessary. Remove the water pump tube screw. Remove the gasket compound from the lower unit. Now it's time to get that new water pump in your boat.

Follow these steps to do so:. Mix the gasket sealing compound well. Clean the lower unit's water pump surface area. Place the gasket sealing compound on both sides of the gasket. Install the wear plate. Install the impeller key. Note the position of the key held by the wheel bearing grease. Install the pump cup in the pump housing. Line up the pump cup in the pump housing. Cover the impeller with wheel bearing type grease. Note the key-way location of the impeller before installing on the drive shaft.The Evinrude marine outboard motor uses a water pump in the lower unit case to circulate water through the engine passages and manifold.

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The water pump keeps the motor within normal operating temperatures. The procedure for replacing the rubber impeller inside the water pump is basically the same for long- and short-shaft motors.

You should have a boat owner's repair manual nearby, since some models differ in configuration and design. Impeller kits can be obtained from any marine supply store, complete with gaskets and new mounting hardware.

Stabilize your boat with wheel chocks if it remains on the trailer. Disconnect the negative battery cable on your marine battery with a socket and remove the ignition key. Locate the mounting bolts that hold the lower unit case to the upper unit. Small engines might have only two bolts, while larger engines may have four or five.

Loosen and remove the bolts with the proper size socket. Have an assistant help you lower the case just an inch or so. Locate the shifting rod that extends down into the lower case. Remove the small coupler bolt that holds the two shifting rods together and pull the coupler out.

Pull the lower unit down and free of the upper case. Take the lower unit to a work bench and lay it on its side, letting any gear oil drain into a small pan. Use a socket to remove the two or three bolts on the top of the impeller casing and pull the casing up over the drive shaft. Flip the impeller casing over. Note whether the rubber impeller blades inside the case spin left or right. Pull the impeller out, making sure not to lose the shaft key, if it has one.

Clean out the inside bore of the impeller housing with carburetor cleaner and a rag. Lubricate the inside of it with petroleum jelly. Place the new impeller inside the top casing in the correct blade orientation, and insert the shaft key, if so equipped. Slide the casing down over the drive shaft and align it with the mounting holes. Clean the upper and lowering impeller case mating surfaces with a gasket scraper. Install the new gasket on the upper casing.Forgot your password?

Started by NEStripersMay 4, A few weekends ago I picked up this Johnson 9.

How to Change the Impeller in an Evinrude Motor

I threw her in a barrel with some fresh gas and hooked up a battery; after two clicks she sparked right up. A few tweaks of the adjustment screws and the motor was idling like new. The neglect and abuse that this generation of OMC motors can handle always amazes me.

I let the motor idle in the barrel until she warm then checked that both the forward and reverse gears spun the prop correctly and moved water. The first step was to loosen up — but not completely remove — the 6 hex bolts connecting the lower and upper units. The goal here is to expose the upper slotted screw of the brass coupling connecting the shift linkage so that the screw can be removed and the lower unit will pull freely after completely removing the 6 bolts.

If the bolts are removed first, the weight of the lower unit can bend and damage the shift linkage. I like to hold the lower unit between two pieces of 4x4 clamped to my bench.

1975 johnson 70 hp impeller replacement

It gives me the freedom to easily remove the lower unit if it needs to be maneuvered or to be able to tip it upside down if a screw falls into one of the cavities. This was my first look at the water pump undoubtedly original and it confirmed all of my suspicions. Luckily, there was no other evidence of salt or corrosion that I could find. Out with the old, in with the new! OMC made few dimensional updates to the outside of the housing and notably a material change from a powered metal to a glass reinforced plastic.

The important thing to note here is that the direction of the impeller fins MUST be oriented identically to the original. Since the motor shaft only spins in one direction, installing the fins in the wrong direction will mean no to very little output from the water pump and a likely damaging the new impeller. The trickiest part when reinstalling the new unit was keying in the new impeller pin. I used a very narrow pair of needle nose pliers and some thick grease not pictured to help hold the pin in place.For example, we enjoyed betting on our favourite teams from the NHL, NBA, NFL and more, while also trying our luck on some Champions League soccer from Europe.

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