Special Tools to Repair Evinrude Outboard Motors

Updated February 21, 2017

Evinrude outboard motors have been around since 1911, in one incarnation or another. Today's Evinrude motors have evoloved from Ole Evinrude's first 62-pound, 1.5-horsepower outboard, becoming feats of complex engineering with a need for highly specialised set of tools that do one thing only; often, these special tools are the only tools that can do that job efficiently. Knowing which ones you need depends on which outboard repairs you plan to undertake.

The Powerhead

There are five specialised tools that are recommended by Evinrude for work on the motor's powerhead. They include an Evinrude tappet adjustment tool, part No. 341444, that provides easy access to the tappet adjuster screws on the cylinder head, and the Evinrude tappet holder tool, part No. 345832, that's used during valve lash adjustment on 40- and 50-horsepower motors and nowhere else. The Evinrude tapered roller bearing installation tool, part No. 345824, makes installing tapered roller bearings less frustrating, and a lever-type valve spring compressor, part No. 341446, keeps valve springs under control for larger V-6 Evinrudes. When you overhaul your motor, you'll also need the piston wrist pin driver, part No. 392511, to avoid damage to the tapered wrist pins. The Evinrude slide hammer, part No. 432128, that you'll find useful in both the powerhead and in the lower unit. All of these tools are available from your Evinrude dealer.


The carburettor only has three special tools, but they simplify the work greatly. The first is the ball hex driver, part No. 327622, that's used for adjusting the cam follower adjustment screw. The second is the ball socket remover, part No. 342226, that's used to free the throttle cable ball socket from the ball on the throttle lever. Finally, there's part No. 324891, the float gauge tool, that's used to set the float gauge height when you rebuild the carburettor. The float gauge may have notches for several different size motors; ask, or check the shop manual before assuming the float gauge is correctly marked; the most notable discrepancy is the notch for the 40- and 50-horsepower motors. You use the 9.9-horsepower notch instead of the notch marked "40/50."

Lower Unit

The lower unit, home to the propeller shaft, the propeller shaft bearing carrier, the gears, the driveshaft, the shift shaft, the water pump, all of the seals for the drive system and the propeller shaft. One motor, the RescuePro, has a rotor, rather than a propeller, which means it needs a special tool, the Evinrude rotor removal tool, part No. 345104. Bearings and seals are removed with the Evinrude bearing and seal installer, part No. 342685; a puller bridge plate, part No. 432127; a backing plate, part No. 115312; and a specialised internal-jawed puller, part No. 432130. The seals on the propeller shaft bearing carrier assembly are placed with the Evinrude seal driver, part No. 319875; and the Evinrude seal installer, part No. 326556. When reassembling a disassembled lower unit from which the pinion bearing has been removed, the pinion bearing driver, part No. 391257, is called into service for all motors except the 5-horsepower motor. The 5-horsepower motor uses a different pinion driver, known as part No. 432131. Since the lower unit is home to the driveshaft, the Evinrude driveshaft holder, part No. 311875, is used for reinstallation of the driveshaft. When installing the gears in the lower unit, the Evinrude gear holder, part No. 342689 will put pressure on the gears, holding them in place while you complete the installation.

The Tilt/Trim Unit

The tilt/trim unit on Evinrude motors has a pin in the stern bracket. To remove this pin, you use the slide hammer previously mentioned, along with an adaptor, part No. 340624, for the sole purpose of removing that pin.

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About the Author

Will Charpentier is a writer who specializes in boating and maritime subjects. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. He is also a certified marine technician and the author of a popular text on writing local history.