Signs Of Damage To Cylinder Liners In The Endoscope

WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

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 colour with a slight speckled effect in places. The liner keeps its silver colour in places with more intense lateral force transmission. →

Fig 1: Identifying Perfect Cylinder Liner

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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 colour with a slight speckled effect in places. The liner keeps its silver colour in places with more intense lateral force transmission. Minor visible marks can be ignored. -arrow-

Fig 2: Locating Ideal Condition Of Used Engine

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Courtesy of PORSCHE CARS NORTH AMERICA, INC.

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 colour in areas subject to higher lateral force transmission. Minor visible marks can be ignored. →

Fig 3: Identifying Ideal Condition Of Used Engine With Polished Running Tracks 1

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Fig 4: Identifying Ideal Condition Of Used Engine With Polished Running Tracks 2

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Fig 5: Identifying Ideal Condition Of Used Engine With Polished Running Tracks 3

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Fig 6: Identifying Ideal Condition Of Used Engine With Polished Running Tracks 4

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Damaged cylinder liner!=> Engine damage! Extensive areas of deeper scoring are apparent in this state -arrows- .

Fig 7: Locating Damaged Cylinder Liner With Deep Scoring

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Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Damaged cylinder liner! => Engine damage! Liner damage, piston seizure . Signs of this type of damage include knocking noises due to inadequate piston guidance in the cylinder, rough idling, blue smoke, the Check Engine light may come on. Negative pressure loss test.

Fig 8: Identifying Piston Seizure

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