Part 19 Removal of Pistons ...

Introduction ...

This page contains photos of the process of removing the pistons from a ROTAX 912ULS engine (built August 2006.



ROTAX 912ULS Piston Removal

Image 1

Here is a photo of the piston from cylinder 2 already removed ...

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ROTAX 912ULS Piston Removal

Image 2

We are going to remove the piston from cylinder 4 next to it ... "

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ROTAX 912ULS Piston Removal

Image 3

Remove the piston circlip using some circlip pliers or a specially adapted screw driver. Then gently push the gudgeon pin through the piston and through the small end of the conrod using whatever clean tool that looks as though it will fit - in this case this is just the end of a 3/8 socket extension. ...

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ROTAX 912ULS Piston Removal

Image 4

In this photo we can see the piston pin (or gudgeon pin) emerging from the other side of the piston. Sometimes it is possible to just push the piston pin through with your finger. Sometimes it is a tight enough fit to warrant using Rotax's dedicated piston pin removal tool to pull the piston pin through the piston but in most instances this tool is complete overkill. Once the piston pin is clear of the small end the piston can be lifted away ...

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ROTAX 912ULS Piston Removal

Image 5

Here follows a selection of photos of the shortblock with all the pistons removed ...

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