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Water pump impeller change

I have a 1989 mercury outboard 35 hp...i need to change water pump.....i backed off 3 bolts in lower unit.....but the housing is one piece to the motor base .....do i need to remve all those nuts??or is it easier than that???

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There is another bolt up under the zinc plate on the cavitation plate.

Posted on Oct 12, 2010

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I have a 50 hp Johnson outboard or do I disconnect the shift linkage to get the lower unit off


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Jul 07, 2017 | Johnson Boating

2 Answers

Can't get 1976 evinrude 6hp to pump water I changed water pump


have you changed the impeller inside the lower unit.

There is copper pipe to redirect water up into the engine.

When you replaced the impeller make the copper pipe is insert onto the engine.

Jul 31, 2012 | Light Outboard Motor Boat Bass Fishing...

1 Answer

1977 9.8 hp Mercury Outboard Motor Serrial # 4605112, it's an electric start with a short shaft


put it in forward gear. Drop the lower off by releasing the bolts and nuts holding it holding the lower on. (one is hiding under the back pick up screen)- some models had a plug in the back top of the exhaust/intermediate housing hiding an allen head bolt pointing down.

Once released, put a protector in a vise and clamp the lower to the bench.

2 screws or bolts will hold the water pump cover on. (the drive shaft runs thru it) Clean the carbon and rust off the drive shaft will allow the pump housing and impeller off the lower. Retrieve the funny looking key drive which runs the pump.

Inspect the shaft, the lower unit oil for water. and find all the pieces of the water pump impeller which may have gone places they shouldn't have.- including the outlet tube from the power head. Check this by putting a tube on the end and blowing- you should hear and feel the pressure in the exhaust and tell tale hole.

Now take the model number , the old pump parts to the marina for a replacement. Do a side by side comparison at the marina so you get the right stuff. Check the inside drive of the rubber impeller and see if they are exactly the same.

NOW- put the new wear plate / gaskets and drive key on, hold in place with grease. Slide the impeller on the key and spin the drive in both directions to be sure it has the impeller and will securely turn it.

Put grease in the cup of the pump housing to prevent dry start and help seat the impeller blades. Spin the shaft as you lower the housing in the pump so the blades all face in the right direction (clockwise). Screw in the bolts. Grease up the seal the watertube goes in and the spline end of the drive shaft.

Up the hole it all goes, now you only have to spline the shifter (it hasn't moved has it?) The drive shaft and the water tube all at the same time.

Check the shifter for correct position and bolt it down

Jul 28, 2012 | Mercury Mark 30 Hipo Outboard Motor...

2 Answers

1997 Evinrude 50 HP SPL. I have removed all the bolts holding the lower rnd to the engine, it seems to be hanging up on the shify shaft, and I can't find a way to drop the unit. It drops down about...


Okay this is on total memory. The shift shaft for a lot of those engines goes right up through the pilot shaft and exits just in front of the block under the carburetor(s). You will see the **** linkage arm connected to this shaft sometimes it's double nutted. See if you can slide the lower unit back up to the housing and put a bolt in it to hold then undue the shift shaft linkage, Remove the bolt and drop the lower unit. Be careful of the water tubes and check make sure the rubber grommets are in place in the pump housing not on the tubes. Clean up the pump housing and install the new impeller kit.
Put the impeller down the shaft on top of the impeller plate, lightly grease the inside of the housing the impeller plate and impeller. Then lower the pump housing down to the impeller while turning the drive shaft clockwise lightly push down on the impeller housing. This will fold the impeller blades all in the correct position and provide lubrication to the pump until the water gets into the pump. To make life easier re-grease the drive shaft spline and the water tube grommets this will ad ease in reinstalling the lower unit. be careful to make sure you thread the drive shaft, water tubes and shift shaft all in at the same time. After installation you may find you need to adjust the **** linkage.

Dec 11, 2010 | Boating

4 Answers

How to replace water pump on a 1985 90 hp mariner outboard motor


mcdevito75 Here, If I;m not mistaken the water pump is in the lower houseing, a big job, let the marina take care of it as the water pump should be Changed only if it doesn"t pump at all.

Jun 16, 2010 | 2004 Mercury Mariner

1 Answer

How do I change the water pump impeller on a mercury 7.5hp outboard?


get the kit from boat shop all it takes is four bolts and remove the lower housing.. when you put the impeller in... flex the blade the same way take a photo before you take it apart...inside get a new gasket for between the upper and lower housing too...

Apr 05, 2010 | Boating

1 Answer

Mercury 20Hp impeller/water pump location


It is located inside the lower unit housing. They are fairly easy to replace. Most Mercury authorized service stations will charge around $120 for this task.

Triton72

Mar 26, 2009 | Sport & Outdoor - Others

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