Broken Lower Unit Bolt - Smooth Move..

[bumrunner]

I was taking off the lower unit so I could check the condition of the impeller and "SNAP" - The head of one of the bolts sheared right off. It looks like they used locktite when putting these bolts in as it took all my weight to budge them. Now that I've completely messed up, what do I do?

 

[Fishermark]

Re: Broken Lower Unit Bolt - Smooth Move..

What are you working on? And which bolt / stud broke?

 

[bumrunner]

Re: Broken Lower Unit Bolt - Smooth Move..

These were the 4 main bolts that hold the lower unit to the rest of the motor. I'm guessing 5/16 bolts. Once these bolts are off, I should be able to pull the lower unit down and get to the impeller.

 

[Bondo]

Re: Broken Lower Unit Bolt - Smooth Move..

These were the 4 main bolts that hold the lower unit to the rest of the motor. I'm guessing 5/16 bolts. Once these bolts are off, I should be able to pull the lower unit down and get to the impeller.

Ayuh,.... Hard to say,.... WHAT are you workin' on,..??

 

[bumrunner]

Re: Broken Lower Unit Bolt - Smooth Move..

Sorry all, it's a 9.9 Bigfoot Mercury outboard year 2000. I believe the lower unit is larger than regular 9.9's producing more torque

 

[bumrunner]

Re: Broken Lower Unit Bolt - Smooth Move..

Sorry guys, its a 2000 Mercury Bigfoot 9.9 - I think it has a larger lower unit to produce more torque than a standard 9.9.

 

[Kainon]

Re: Broken Lower Unit Bolt - Smooth Move..

Thats not locktite, thats corrosion. put a bunch of propane torch heat to 1 at a time and should be able to remove, use a 6 point socket, better fit than a 12 point.

 

[indy440]

Re: Broken Lower Unit Bolt - Smooth Move..

does the bolt thread into the middle section of the lower unit?

I'd say drill into it for an EZ out, but heat the **** out of it before trying to turn it! If it snapped the bolt head off it snap the EZ out if you dont heat it!!!!

 

[Fishermark]

Re: Broken Lower Unit Bolt - Smooth Move..

Sorry guys, its a 2000 Mercury Bigfoot 9.9 - I think it has a larger lower unit to produce more torque than a standard 9.9.

You're in the wrong forum. You might want to post the same in the Mercury outboard forum.