Question about 2004 Mercury Mariner

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Gear shifter for 40 h. p. mariner outboard

I removed the lower unit on my 40 horse, 1986 mariner outboard, to repair the water pump. When I replace the l. u. the gears hang up and I can't free them without removing the lower unit again. I would appreciate your advice. Thanks

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With your lower unit off have someone shift the engine into forward while watching the gear shift select shaft's rotation,let gearshift remain in forward,now place your lower unit in forward and reinstall. In the future just put engine in forward when installing a water pump as there won't be a need to move gearshift

Posted on Jul 24, 2009


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The most likely problem is you have a bent shift fork inside the transmission.
You can either go used or try to rebuild it.
You can try this as well.
1 - either block the wheels from turning or put the emergency brake on.
2- put the standard shift in neutral
3 pull the plastic ring around the shifter up.
3 remove the cover
4 - remove the four bolts holding the inner cover off
5 -remove the shifter bolts [4]
6-put an old towel down to cover the seats and other areas -
7 pull GENTLY and CAREFULLY until the entire shift mechanism comes lose.
8 - check and have someone else check to see that the shifter is straight and not bent. The bottom part of the shifter with the knob looking unit on it - should be straight down from the shifter that you use to shift the gears. If this is bent - I would get an after market shifter - or you can replace with a factory shifter.

Reverse the above directions to complete the job.
If nothing is bent -then you must rebuild or replace the transmission.

Hope this helps you get this repaired.

If I helped please rate me high.

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