How to Repair a Broken Skeg

Easily repair a broken skeg on your outboard or sterndrive.
How to Repair a Broken Skeg
Removing the gear case, while not required, makes this job easier. Doing so requires basic tools like a socket, screwdriver and/or wrench set. Once removed, lay the lower unit on its side for a straighter cut on the damaged skeg. Tim Barker

The skeg of an outboard or sterndrive gear case provides much directional stability and steering ease. Whether caused by running aground or due to some land-bound calamity, a broken or damaged skeg adversely affects handling. In some cases, a welder can repair your skeg. When I needed to repair the bent skeg of the Yamaha outboard that powers my Edgewater 228 CC charter boat, I elected to do it myself using a Megaware SkegGuard. Made of mirror-polished stainless steel, a SkegGuard works as long as at least 3 inches of stub remain of the broken skeg. Here’s how I did it.

Skill Level: 1/5
Finish Time: 2 Hours

Tools and Supplies
* Megaware SkegGuard ($99.95, various sizes)
* Jigsaw with bi-metal blade
* 3M Scotch-Brite pads (green or red)
* Drill motor
* Cobalt or HSS drill bit (1/4-inch)
* Mallet
* Mill-bastard file
* Wire brush


Removing the gear case also gives you a chance to replace the water-pump impeller, housing and gasket to ensure max cooling performance. It’s relatively easy on most outboards. Check your owner’s manual and do-it-yourself videos on the Web for your brand of motor. Be sure to keep the bolts and washers that connect the lower unit to the midrange section of your outboard engine in a safe place (like a large cup) so they don’t get lost prior to reassembly.

How to Repair a Broken Skeg
Cut Flush Tim Barker

Cut Flush
I used a jigsaw fitted with a bi-metal blade to cut the bent skeg off and present a clean and level surface. A SkegGuard requires at least 3 inches of stub remaining from the original skeg in order to be affixed. Don’t cut off too much.

How to Repair a Broken Skeg
Prep the Surface Tim Barker

Prep the Surface
Use a mill-bastard file and/or an abrasive Scotch-Brite pad to deburr the cut edges of the outboard or sterndrive’s skeg stub. Use a stiff-wire brush to clean off metal bits and filings. Wipe clean with a solvent-dampened rag.

How to Repair a Broken Skeg
Dry Fit Tim Barker

Dry Fit
Using a plastic or wooden mallet, or tapping with a hammer and a scrap of wood, tap the SkegGuard into place over the old skeg and check everything for a proper fit. Tap it firm enough to make sure it is well-seated on the stub of the original skeg.

How to Repair a Broken Skeg
Drill Holes Tim Barker

Drill Holes
Using the SkegGuard with its pre-drilled holes as a template, drill two 1/4-inch holes completely through the skeg. Be sure to drill straight and square. A high-speed steel (HSS) bit will work, but I used a Cobalt bit, which dissipates heat better.

Insert Bolts
The SkegGuard comes supplied with bolts in various lengths to accommodate varying thicknesses of skegs. Locking sealer is pre-applied to keep the bolts from loosening. Insert the appropriate bolt and use the supplied hex tool to tighten.