Symptoms : Smoke From Exhaust, Oil In Intake, Rear Main Seal Leakīad rear main seal or something else causing the problem?Īs an integral part of the emissions system, the Air Oil Separator (AOS) is designed to extract oil from gases in the crankcase. Causes of the seal failure should be checked thoroughly by a competent shop before you proceed to replace the seal. The seal does dry over time and can leak, however, there are other potential issues that could also cause the seal to leak (see Air Oil Separator below).
Replacing the seal requires the removal of the transmission and in a manual car, replacement of the clutch at the same time is a good choice. The seal needs the heat of driving to remain sealed efficiently, so in some circumstances the leak can slowdown or stop during the driving season. Some caution – vehicles that are stored often display a weep/leak from the seal during storage or at the initial startup in the spring. The leaking seal will quickly destroy a clutch in a manual car if not addressed promptly. A leaking rear main seal appears through the bell housing joint between the center of the engine and transmission joint. One of the most common, misunderstood and potentially destructive issues is an oil leak from the rear main seal on the Porsche engine. Symptom : Oil Leak Between Engine & Transmission The lower seal leaking is more of an issue and requires removal of the camshafts. The upper seal can be replaced when removing the valve cover. The early engines had a plastic tube insert and the later engine features two seals. If you see oil on a plug or coil, always replace the seals. The tube fills with oil and causes misfires by destroying the plug and the coil. Often, you wont see the oil initially as it’s sealed in by the coil on top of the spark plug. Spark plug tube seals are also prone to leaking – leaks from the spark plug tube seals can be frustrating. Symptom : Misfires CEL or Oily Spark Plugs The time consuming part is removing the old gasket sealer from the valve cover to ensure a good seal for the replacement. The valve covers do not have a gasket – instead a liquid gasket sealer is used. Valve cover leaks are obvious and fairly straightforward to fix on most models. Symptom : Oil Drips On Floor Behind Rear Wheels Less common are leaks from the cam seals and scavenger oil pump seals.
Some of the most common include rear main seal (see below), valve covers, spark plug seals and turbo oil supply line seals. Porsche vehicles have a number of regular sources for leaking oil. If your 911 has mechanical issues that don’t appear here, simply drop us an email via the forms or pop-up contact and we’ll do our best to share a solution with you.Ĭlicking on a heading gives you more detail. Can’t Find An Answer Below? – Contact Us For More Help
However, neglecting maintenance can cause issues – check your last service update with our recommended maintenance schedules.
If you’re researching and considering buying a 911, our used car buyer guides highlight mechanical issues to be aware of before you complete a purchase.Ĭheck engine light? Scanned the car and not sure what to make of those OBD codes? Our article on how to interpret and make sense of those fault codes may help. These are the most frequent 911 problems diagnosed by our repair shops over the years.Īn accurate diagnosis of an issue by a Porsche mechanic typically saves you time and money – see our guide to local independent Porsche repair shops that can help. Listed below are Porsche 911 common mechanical problems with their likely resolutions. Porsche 911 Common Problems Smoke at Start-Up or Check Engine Light, etc?
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