Cayenne GTS (9PA) V8-4.8L (2008)
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Disconnect the battery and make sure the vehicle cannot start.
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Pull the endoscope out of the spark plug recess before turning the crankshaft with your hand.
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Only observe a downward-moving piston using the endoscope.
5. Light up conspicuous, suspect cylinders with the endoscope and examine them. Use Storz endoscopes for Porsche vehicles WE 1057 or a similar
endoscope for this.
5.1.
Remove spark plugs (if you have not already done so, or if you have re-installed them).
5.2.
Turn the piston in the relevant cylinder to the bottom dead center. To do this, turn the crankshaft clockwise at the vibration balancer until the
piston crown is positioned as far down as possible when viewed through the endoscope.
5.3.
Adjust the endoscope to its brightest setting and have a good look all around the cylinder liner. You can also shine a torch into the spark plug
recess to help you check for damage.
5.4.
Examine the cylinder liner all the way around.
6. If you discover engine damage, install a short engine (4.5-liter).
Signs of damage to cylinder liners in the endoscope
Ideal condition of used cylinder! - Continued use acceptable! The typical fine-marking that develops at a very early stage is apparent. The liners are a
yellow-brown color with a slight speckled effect in places. The liner keeps its silver color in places with more intense lateral force transmission.
Perfect cylinder liner
Ideal condition of used cylinder! - Continued use acceptable! The typical fine-scoring that develops at a very early stage is apparent. The liners are a
yellow-brown color with a slight speckled effect in places. The liner keeps its silver color in places with more intense lateral force transmission. Minor
visible marks can be ignored. -arrow-
Ideal condition of used engine
Ideal condition of used cylinder! - Continued use acceptable! (4 illustrations) A typical polished cylinder liner, which develops at an early stage, is
evident. The liners have several polished, shiny silver areas. The liner retains its silver color in areas subject to higher lateral force transmission.
Minor visible marks can be ignored.
