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How do I remove lower unit to replace water pump on 50 hp 4 cycle out board?

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  • Dana Pack Apr 27, 2010

    I removed all bolts from lower unit, but the bottom part does not come free. I tapped with hammer, but unit is still tight with upper part of motor. Do I use more force?

  • Dana Pack Apr 27, 2010

    I can not get my lower unit to let go of the upper part on my 2001 50 hp Yamaha 4 stroke boat motor. I have tapped it with hammer. Should I use more force? I need to change the water pump.
    Thanks

  • Dana Pack Apr 29, 2010

    Daveslave



    I still can't get the lower unit to let go. I took oak 2"x 2" placed on the lip of the unit and hit pretty hard with a dead blow hammer, and still not loose. What else can I do? I have removed a total of 5 bolts. There is nothing else I can see holding it.



    Help

  • Dana Pack Apr 29, 2010

    IT IS F50TLRB



    62Y L 1002589



  • Dana Pack Apr 29, 2010

    Yahama Four Stroke



    F50TLRB



    62Y L 1002589





    Year 2002



    This is all info on tag



    Thanks

  • Dana Pack Apr 30, 2010

    That got it. There is a hidden bolt under that plate.



    Thank you so much



    Dana Pack

  • Dana Pack Apr 30, 2010

    I could have never gotten the lower unit off with out the help of Fixya experts. Thank you.

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  • Expert
  • 154 Answers

These are installtion instructions for a mercury so it may vary just a little if any.

  1. Remove the bolts from the lower gear housing (the portion of the motor that has the prop attached). Be sure the transmission is in neutral and that all four bolts are removed from the housing.
  2. Step 2 Slowly, but firmly pull the lower housing away from the upper housing. The only things holding the two parts of the housing together at this point will be the driveshaft, transmission shaft and wiring harnesses. Disconnect the wiring harnesses and pull the lower housing the rest of the way off.
  3. Step 3 Mount the lower housing in an engine vice with the driveshaft pointed up or parallel to the ground. Remove the four bolts holding the water pump onto the transmission using the ratchet set. Carefully slide the water pump housing up over the driveshaft.
  4. Step 4 Using a screwdriver, pry the impeller out of the housing and examine it for cracks or inconsistencies. Also inspect the interior of the water pump housing for cracks, gouges, or general wear.
  5. Step 5 Remove the water pump gaskets still attached to the top of the transmission housing. There should be three in this order: rubber gasket, metal gasket, rubber gasket. Replace with the new gaskets from the water pump repair kit (make sure to lube the gaskets with the engine oil prior to mounting).
  6. Step 6 Slide the new impeller down the driveshaft and then seat the water pump housing on top of it. Give the driveshaft a slight clockwise turn while pushing down on the water pump housing in order to bend the impeller fins in the correct direction. Reinstall the four water pump bolts and slide the transmission housing back into place with the motor housing.
  7. Step 7 Reconnect the wiring harnesses, mount the upper and lower housings together and replace the housing bolts. Test the water pump by lowering the motor into the water and turning it on. Water should spray in a stream out of the water purge hole if the pump is working correctly.

Posted on Apr 27, 2010

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  • dave taylor Apr 27, 2010

    you need more force not blunt force, but firm force because its on thier very tight, has to keep water tight so i would get another guy to help u pull it apart because when i did it, it took two. sorry it took so long didnt realize u still had problems good luck



  • dave taylor Apr 29, 2010

    ok whats the model number, ive done this to like 10 ouboard motors they get stuck but pressure is the key let me look up your particular motor so i can see what exactly is going on.

  • dave taylor Apr 30, 2010

    did you take the round metal plate off above the propellor there is a bolt under there too. Sorry just got off work trying to get this problem resolved for you.

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  • Master
  • 1,194 Answers

Hi,
Thanks for using Fixya.
To remove the lower unit to replace water pump, please follow these instructions:-
1. Remove the bolts on your lower unit (just below the anti-cavitation plate) using a 12 to 14 millimeter wrench. The make of your outboard motor will determine which size wrench you need to use. All the bolts should be the same size.
2.Take the trim tab (anode) off the bottom of the anti-cavitation plate. You will find the tab right above the propeller. The tab's position on most outboards will be bolted through the bottom of the trim tab. Keep the tab and the bolt separated after you remove them.
3. Remove the last bolt from the lower unit. This will actually detach the lower unit from the motor. Handle this step cautiously to avoid having your lower unit slide out uncontrollably. The lower unit should be entirely free from the motor after you perform this step.
4. Place the lower unit that you removed in Step 3 aside in a safe place. The motor and shift shafts will be exposed once the lower unit is removed. Proceed with removing the motor and shift shafts by applying gentle pressure and sliding them out.
5. Take the bolts off the plastic casing that houses the water pump. Handle the bolts with care to minimize breakage due to corrosion. You should easily be able to lift the casing off of the water pump once you have removed these bolts.
6. Slide the pump impeller over the motor shaft. Remove the steel plate along with the gasket that the impeller was on.
7. Take the stainless steel cup and "o" ring out of the plastic casing that you previously removed. Also, remove the key way from the motor shaft by gently tapping it with a standard screwdriver (flathead) in a top-down motion.
8. Lay the parts of your new water pump kit out neatly in your work space. Installation of your new outboard motor water pump will take place in the exact reverse of dis-assembly. Replace the gasket for the steel plate in it's original location. Put the gasket back over the steel plate and make sure that is securely fitted over the gasket. Install the new key way. Locate the small indentation on the impeller and line it up so that it is properly placed back atop the stainless steel plate. Put the new "o" ring around the outside edge of the cap. Set the new stainless cup in place inside the plastic casing. Slide the stainless cup and "o" ring over the motor shaft to the impeller. Turn the motor shaft clockwise while pressing down on the plastic cap. Grease the bolts that secured the plastic casing and replace them.
9. Grease the tops of both the motor and shift shafts. Grease and replace the bolts.
10.Reinstall the lower unit by finding the two holes in the mid-section of the motor. Line the shafts up to the holes and insert.
Good luck and have a nice day.

Posted on Apr 29, 2010

  • Ranglo
    Ranglo Apr 30, 2010

    If you think you are helped by my solution, please rate it accordingly.

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  • Master
  • 821 Answers

Hello,kindly follow the instructions below


  1. Remove the bolts on your lower unit (just below the anti-cavitation plate) using a 12 to 14 millimeter wrench. The make of your outboard motor will determine which size wrench you need to use. All the bolts should be the same size.
  2. Step 2 Take the trim tab (anode) off the bottom of the anti-cavitation plate. You will find the tab right above the propeller. The tab's position on most outboards will be bolted through the bottom of the trim tab. Keep the tab and the bolt separated after you remove them.
  3. Step 3 How do I remove lower unit to replace water pump - fix-outboard-motor-water-pump-1.3-120x120.jpg jQuery(document).ready(function(){ jQuery('#jsArticleStep3 span.image a:first').attr('href','http://i.ehow.com/images/a04/er/6f/fix-outboard-motor-water-pump-1.3-800X800.jpg'); }); Remove the last bolt from the lower unit. This will actually detach the lower unit from the motor. Handle this step cautiously to avoid having your lower unit slide out uncontrollably. The lower unit should be entirely free from the motor after you perform this step.
  4. Step 4 Place the lower unit that you removed in Step 3 aside in a safe place. The motor and shift shafts will be exposed once the lower unit is removed. Proceed with removing the motor and shift shafts by applying gentle pressure and sliding them out.
  5. Step 5 jQuery(document).ready(function(){ jQuery('#jsArticleStep5 span.image a:first').attr('href','http://i.ehow.com/images/a04/er/6f/fix-outboard-motor-water-pump-1.5-800X800.jpg'); }); Take the bolts off the plastic casing that houses the water pump. Handle the bolts with care to minimize breakage due to corrosion. You should easily be able to lift the casing off of the water pump once you have removed these bolts.
  6. Step 6 jQuery(document).ready(function(){ jQuery('#jsArticleStep6 span.image a:first').attr('href','http://i.ehow.com/images/a04/er/6f/fix-outboard-motor-water-pump-1.6-800X800.jpg'); }); Slide the pump impeller over the motor shaft. Remove the steel plate along with the gasket that the impeller was on.
  7. Step 7 Take the stainless steel cup and "o" ring out of the plastic casing that you previously removed. Also, remove the key way from the motor shaft by gently tapping it with a standard screwdriver (flathead) in a top-down motion.
  8. Step 8 Lay the parts of your new water pump kit out neatly in your work space. Installation of your new outboard motor water pump will take place in the exact reverse of dis-assembly. Replace the gasket for the steel plate in it's original location. Put the gasket back over the steel plate and make sure that is securely fitted over the gasket. Install the new key way. Locate the small indentation on the impeller and line it up so that it is properly placed back atop the stainless steel plate. Put the new "o" ring around the outside edge of the cap. Set the new stainless cup in place inside the plastic casing. Slide the stainless cup and "o" ring over the motor shaft to the impeller. Turn the motor shaft clockwise while pressing down on the plastic cap. Grease the bolts that secured the plastic casing and replace them.
  9. Step 9 Grease the tops of both the motor and shift shafts. Grease and replace the bolts.
  10. Step 10 Reinstall the lower unit by finding the two holes in the mid-section of the motor. Line the shafts up to the holes and insert.
  11. thanks for using fixya,
take care.

Posted on Apr 27, 2010

  • Hammid Disu Apr 27, 2010

    hello,please look vividly that you have removed all the bolts successfully,it is not that difficult.you can as well follow the video link below....


    http://www.youtube.com/watch?v=E-uzQi7Ig...


    take care.


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