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Forum pour les questions techniques sur les 997
Membre
Chers tous,
Je reviens sur le forum après bien longtemps. Heureux proprio d'une 2.0S de 68, je suis en train d'acheter une moderne (enfin, par rapport a mamie...), a savoir une 997S de 2007.
Le moteur a ete change (suite a un plantage en retrogradage, apparemment) il y a 115.000km.
Le PIWIS est relativement clean, avec la derriere zone 4 il y a plus de 25.000km, ce qui ne me terrorise pas trop.
Mais est-ce que vous recommandez un test de compression, voire meme une 'endoscopie' (je crois que c'est le mot...) des cylindres ?
Desole pour le super rush mais si je fais faire ces tests c'est demain, alors ca urge un peu !!
M E R C I ! ! ! !
Antoine
Je reviens sur le forum après bien longtemps. Heureux proprio d'une 2.0S de 68, je suis en train d'acheter une moderne (enfin, par rapport a mamie...), a savoir une 997S de 2007.
Le moteur a ete change (suite a un plantage en retrogradage, apparemment) il y a 115.000km.
Le PIWIS est relativement clean, avec la derriere zone 4 il y a plus de 25.000km, ce qui ne me terrorise pas trop.
Mais est-ce que vous recommandez un test de compression, voire meme une 'endoscopie' (je crois que c'est le mot...) des cylindres ?
Desole pour le super rush mais si je fais faire ces tests c'est demain, alors ca urge un peu !!
M E R C I ! ! ! !
Antoine
Membre
Membre
Peter Morgan a l'air de dire que ça peut être risqué:
Q: Is a borescope check essential during an inspection on a 997?
A: A borescope check does little more than tell you the condition of the engine at that point and it is easy to confuse normal cylinder wear with cylinder damage due to scoring. The unscrupulous can use such checks to justify the need for a major engine rebuild. In the right, experienced hands, it can be useful for estimating the rebuild cost of an already damaged engine without the cost of taking it apart for assessment. A good cylinder bore can be damaged in very few miles if all the contributing factors are stacked against it.
A borescope check does not need to be a routine check for any used 997. Using a borescope is an invasive diagnostic method that involves removing the right side heat shield and coil packs before removing the sparking plugs. In many cases, when the heat shields and coil packs are removed from a 10 year old engine, either the shield mounts or the packs will need to be replaced. It is also necessary to turn the engine over by hand to get the pistons at the base of the bores. Many service shops have heavily promoted the importance of borescope checks on every Carrera water-cooled engine, but it must be noted they have everything to gain from this, while most engines are not even at risk from the issue. We do not claim infallibility on spotting this issue, but we also err on the side of caution. It can be very difficult for anybody to spot if the seller knows how to conceal the signs.
It is our experience that unless the issue is concealed, the external warning signs discussed above are reliable indicators. If we see the warning signs, we tell you not to buy the car. End of story.
We would also advise you to beware of borescope checks being done by those who don't have the experience to separate normal cylinder wear marking (inevitable on any car with a used mileage) and actual cylinder damage.
http://www.porscheinspections.com/qanda ... %20scoring
Q: Is a borescope check essential during an inspection on a 997?
A: A borescope check does little more than tell you the condition of the engine at that point and it is easy to confuse normal cylinder wear with cylinder damage due to scoring. The unscrupulous can use such checks to justify the need for a major engine rebuild. In the right, experienced hands, it can be useful for estimating the rebuild cost of an already damaged engine without the cost of taking it apart for assessment. A good cylinder bore can be damaged in very few miles if all the contributing factors are stacked against it.
A borescope check does not need to be a routine check for any used 997. Using a borescope is an invasive diagnostic method that involves removing the right side heat shield and coil packs before removing the sparking plugs. In many cases, when the heat shields and coil packs are removed from a 10 year old engine, either the shield mounts or the packs will need to be replaced. It is also necessary to turn the engine over by hand to get the pistons at the base of the bores. Many service shops have heavily promoted the importance of borescope checks on every Carrera water-cooled engine, but it must be noted they have everything to gain from this, while most engines are not even at risk from the issue. We do not claim infallibility on spotting this issue, but we also err on the side of caution. It can be very difficult for anybody to spot if the seller knows how to conceal the signs.
It is our experience that unless the issue is concealed, the external warning signs discussed above are reliable indicators. If we see the warning signs, we tell you not to buy the car. End of story.
We would also advise you to beware of borescope checks being done by those who don't have the experience to separate normal cylinder wear marking (inevitable on any car with a used mileage) and actual cylinder damage.
http://www.porscheinspections.com/qanda ... %20scoring
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