How do I Replace the Cat Muffler on Husqvarna 346Xp Chainsaw?

Written by eric blankenburg
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How do I Replace the Cat Muffler on Husqvarna 346Xp Chainsaw?
Keep your muffler clean and properly connected to the engine during operation. (cutting with chainsaw image by KtD from

The Husqvarna 346Xp chainsaw uses a catalytic converter, which helps reduce harmful emissions, such as hydrocarbons, nitrogen oxides and aldehydes, according to the 346Xp's Operator's Manual. The muffler is designed to "reduce the noise level and to direct the exhaust gases away from the operator." Therefore, you should never operate a chainsaw without a properly functioning muffler. You should replace the muffler if it is broken, cracked, dented or disconnected from the engine block in any way.

Skill level:

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Things you need

  • Small screwdriver
  • Brush
  • Allen wrench
  • Rag

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  1. 1

    Turn off the chainsaw's engine and let the saw cool for at least five minutes before working on the muffler. According the operator's manual, these mufflers get dangerously hot during operation and can start a fire.

  2. 2

    Unscrew the small screw on top of the muffler with the screwdriver. Slide out the spark arrester screen from the muffler. Clean it with a brush or replace it if the carbon deposits are blocking the screen. Set the screw and screen aside in a safe place.

  3. 3

    Unscrew the muffler cover with the Allen wrench by turning the bolts counterclockwise. Remove both of the bolts and pull off the cover.

  4. 4

    Unscrew the muffler's two bolts on the mounting plate, which is connected to the engine. Turn the bolts counterclockwise with the Allen wrench. Remove the bolts and pull off the muffler. Wipe the area on the engine underneath where the muffler sat with the rag.

  5. 5

    Set the new catalytic converter muffler over the engine's exhaust port. Hold the muffler in place and set the mounting plate onto the muffler. Continue holding the muffler in place while tightening the mounting bolts with the Allen wrench.

  6. 6

    Set the muffler cover in place over the muffler. Hold the cover while tightening the bolts with the Allen wrench. Place the spark arrester screen over its hole on top of the muffler. Tighten the screw, which holds the screen in place over the exhaust hole.

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