Jump to content

Gearbox Help

pro fisher

Recommended Posts

hi all,

i was doing some first time maintainence on the outboard gearbox yesterday and everything was going smooth untill i struck one bolt head. it's the bolt that holds the bevelled gear dropping down into the gearbox onto the shaft connecting to the engine itself. i have tried a few things and can't get it undone. i need to undo it so i can get to a ball bearing that won't come out with this gear in the way.

so i was wondering if anyone with experience with these things would happen to know how to undo it...i tried going to a few marine shops but there were no mechanics or anyone that could offer assistence on the topic. i tried holding the shaft still in the vice while trying to undo the bolt but i would budge. is there a special tool needed for the job or a technique that needs to be mastered?

any help much appretiated,


Link to comment
Share on other sites

hint- check right of left hand thread.

They can be tough. Marine shops use a spline socket on the driveshaft to hold and be careful of how you apply the force as you can crack/ damage the gearbox housing if the spanner on the nut is not clear and supported.

Link to comment
Share on other sites

Hi Tom, depending on brand and age of your engine yes Pel says there are driveshaft spline sockets that have a 1/2 drive in them to allow you to remove the pinion nut/bolt.

Without one of these I think you will be fighting a losing battle.

Post brand and HP and I we see if we have one that I can loan you (with a refunded deposit) that will allow you to remove the driveshaft and replace the D/S bearing.



Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...