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1976 mercury v-6 1750 hp outboard igot the motor and the lower end was already taken off and there isa part I never seen besides the impeller its a little housing wioth a plunger typ thing on one in

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  • Mercury Master
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Hey Mark,
Find your engine from this list.. then continue until you find the correct parts diagram that corresponds to what you are looking for...More info would help.. serial number, ID number. any numbers on any plate..
Find Mercury Marine Outboard Motor Parts by Engine Model

Posted on Jun 19, 2017

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Posted on Jan 02, 2017

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I have a 1978 merc 85 hp outboard with a bad pump i purchased a used one that works mine has 4 hoses


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Dec 01, 2015 | Boating

1 Answer

How do i replace the impeller on my 1978 mercury outdrive


Have to take off gearbox,trm tab must also come off and look for nut inside vavity

Oct 01, 2014 | Seloc Mercury Outboard Engine Repair...

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What year is my mercury outboard searial no 3768233


Check here, you'll need the horsepower and lookup the serial-number range...

http://www.iboats.com/basics/serial_number_year.html#mercury

Aug 31, 2014 | Mercury Impeller, Water Pump - for...

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Engine diagram parts


Have you replaced the impeller in the lower unit recently? If so was it in pieces? I would start there.

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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.

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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

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1 Answer

I have a 1998 Johnson 130 hp outboard motor. Have already taken lower unit off but can't get it apart. Is there a secret to taking the lower unit apart? I would like to have a diagram.


Here is a site where you can purchase the service manual to repair your outboard motor:
http://www.tradebit.com/G/manuals/-/0-0-johnson+130+hp

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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

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