Part 16 Removal of Cylinder Barrel and Stud Removal ...

Introduction ...

This page contains photos of the process of removing the cylinder barrels and cylinder studs from a ROTAX 912ULS engine (built August 2006.



ROTAX 912ULS Cylinder barrel and stud Removal

Image 1

Having slid the barrel gently down the cylinder studs away from the crankcase, the cylinder barrel will release the piston. Apologies ... it looks as through I forgot to take a photo of the barrel minus cylinder head with the piston still inside for the first cylinder. Her e is the first removed barrel on the bench ...

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ROTAX 912ULS Cylinder barrel and stud Removal

Image 2

Note the internal cross hatch pattern on the Nikasil coating on the inside of the cylinder barrel ...

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ROTAX 912ULS Cylinder barrel and stud Removal

Image 4

Note the lip of carbon deposits at the limit of piston travel at the top of the barrel ...

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ROTAX 912ULS Cylinder barrel and stud Removal

Image 5

Here we can see the piston still attached to the conrod being cradled by the lower cylinder studs ...

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ROTAX 912ULS Cylinder barrel and stud Removal

Image 7

Here we can see some deposits on the piston crown. What may or may not be apparent from this photo is that the piston rings are loose and free to move in their landings ...

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ROTAX 912ULS Cylinder barrel and stud Removal

Image 8

Remove the barrels one by one. Here we can see the last remaining barrel to remove ...

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ROTAX 912ULS Cylinder barrel and stud Removal

Image 9

And a view of three of the barrels removed from above ...

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ROTAX 912ULS Cylinder barrel and stud Removal

Image 10

These last four images show the four cylinder head nuts that had to be removed on each cylinder ...

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