yamaha lower unit

[ill do it]

i said ill do it myself i have a yamaha 9.9 outboard and the shop wants 400+ to chane the oil seals i said ill do it. well so far no good they were laughing when i left the shop. i broke a few parts so i need to know the best way to remove the nut for the pinion gear. they want you to hold the nut and turn the shaft with a special tool. any ideas

 

[boatguy823]

Re: yamaha lower unit

curious....who are they? ...and yes they are right you need an adapter that fits over the splines of the driveshaft and a wrench to hold the pinion nut....

 

[rodbolt]

Re: yamaha lower unit

bet ya broke the upper seal housing, common rookie mistake.
you will need the splined tool and a good box end wrench of the correct size, if you have access to a junk crank you can cut off the splined end and weld a 1/2 drive socket to it.
other than that its all in the service manual, they are very simple cases.

 

[ill do it]

Re: yamaha lower unit

they are the manual and can i buy one of thease spline adapters?

 

[ill do it]

Re: yamaha lower unit

yes i did and no i dont thanks for the word being a mech hvac i hate to pay $100 an hr for someone to do it it usually works for me this time it cost me but not the four hundred. 117 in parts and that where i am now the spline adapter. i was thinking of wedging a screw driver in the gears to hold them. what do you think

 

[rodbolt]

Re: yamaha lower unit

NNNOOOOOOOOOOOO
you have enough problems, quit creating them.
if I tell you a secret you have to promise not to tell.
once the bearing carrier and the propshaft are removed, clamp the driveshaft in a vise with soft jaws.
then using a 3/8ths drive breaker bar and the correct sized socket simply unscrew the pinion nut. the gearcase and bar will rotate around the shaft, to install subsitute the bar for the torque wrench.

 

[ill do it]

Re: yamaha lower unit

thanks fo the info ill give it a try. of course you want to know the results.

 

[bchoate]

Re: yamaha lower unit

I have also "Made" a tool out of a close fitting deep socket and a small rod or a drill bit to adapt to the driveshaft splines. Just be careful not to let it slip and damage the splines.
As Rodbolt said. " You didnt here it from me"

 

[Yamajoe]

Re: yamaha lower unit

when get this job done right you can have the last laugh