Petrol Lawnmower

This guide explains how to remove and replace the exhaust assembly on an SE475 engine.

Table of Contents

1. Tools Required
2. Removing the Exhaust
3. Replacing the Exhaust
4. Reassembling Components
5. Final Checks

Tools Required

• 10mm spanner or socket wrench

Removing the Exhaust

Step 1 – Remove Retaining Nuts

Locate the exhaust retention nuts.

• Undo the 2 x 10mm exhaust retention nuts
• These are typically positioned on the exhaust mounting points (see reference image markings)
• 

Step 2 – Remove the Exhaust Cover

Once the nuts are removed:

• Carefully take off the exhaust cover
• Place it safely to one side

Ensure no parts are damaged or dropped during removal.

Step 3 – Remove the Exhaust Assembly

With the cover removed:

• Carefully detach the exhaust assembly from the engine
• Set the exhaust assembly aside safely

Replacing the Exhaust

Step 4 – Fit the New Exhaust Assembly

Before installation:

• Check that the exhaust heat gasket is correctly positioned and undamaged

Then:

• Fit the new exhaust assembly into position on the engine
• Ensure it sits correctly and aligns with the mounting points

Step 5 – Refit the Exhaust Cover

• Place the exhaust cover back into its original position
• Ensure it aligns correctly with the mounting holes

Step 6 – Secure the Assembly

• Reinstall the 2 x 10mm nuts
• Tighten securely to ensure all components are firmly held in place

Do not overtighten, but ensure there is no movement in the assembly.

Final Checks

After installation:

• Confirm the exhaust is firmly secured
• Check that the gasket is seated correctly
• Ensure there are no loose parts or gaps
• Start the engine briefly to confirm normal operation