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Bob Jones
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I have a 2002 911 with a Tiptronic trans. My car required the removal of the engine and the trans at the same time, then remove the trans from the engine to access the IMS bearing. I don't know if your 2001 is the same or not. But that being my case I decided to go for a new bearing and a Direct Oil Feed kit since changing the bearing at each clutch change as with manual trans cars would not be my case. On the basis of a couple of local respected PCA members who had gone this route with their favored independent shops I selected a shop who installs a DOF kit and bearing from a company called TuneRS Mall located in Florida. You can ck. them out at www.turnersmall.com. One thing I liked about their kit was that they pull the DOF oil from off the right head rather from above the oil filter as some do. Better ??? but sounds like cleaner oil. Their kit and bearing sold for about $850. Around here you could get the kit and installation for about $2500. Last I looked Tuner had over 17 installers around the country and if you contact them they may be able to direct you to one near you. Since my installation, I have put over 10K on the car and am completely satisfied. Just my experience...good insurance at about 10% of the car's value...good luck! bj
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UPDATE! Turns out my declaration that the change to 15 W 50 oil resolved my taping noise issue was premature. The heavier weight oil sure quietened down various other cold engine noises but not the one I was concerned about. (Long story) Sorry if I misled anyone. After more research and input gathering, I opted for the idea that the noise might be coming from one or more noisey fuel injectors. Having used Chevron Techron in a previously owned 1986 944, I put one bottle in the tank of our noisy 911 and after about 350 miles the noise was reduced to about half the volume. Given the instructions on the Techron bottle noted that more than one application might be necessary, I put another bottle of Techron in the tank and after another 200 or so miles the noise was gone, and I have driven the car another 400 miles and it has still not come back. Solved??? Hope so! May need to add a bottle every 3K miles as per the instructions on the bottle. Re. the DOF modification, I would do it again. I know several who have, and shops that have installed it, and no one has mentioned any issues with it. bj
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Many thanks to you all for your input. I appreciate it. I went through the suggested exercises without any positive results. Afterwards, I did, however, change the oil again to Mobile 1, 15 W 50, (including a new OEM oil filter) which the 2002 Owner's Manual calls for over 50 degrees, and the issue is resolved. Thanks again. bj
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Thanks for the education. I appreciate it. So, again, If you are correct what is the down side to avoiding cold 850 RPM idling as much as possible and otherwise ignoring the noise? bj
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JFP Thx for your suggestion. Given you are a forum moderator I assume you must have a bit of knowledge and exposure to this specific issue and if so I have a couple of questions. So, if your bet is correct, that removing the DOF line and plugging the source on the right cylinder head stops the tapping noise: Why would it take 2 months and 3,000 miles from the time the DOF was installed to the time the noise started? Is your suggestion that something in the engine is not getting enough oil due to the DOF pulling off oil pressure? If so, what specifically are you suggesting is tapping to make the noise? If you are correct what is the down side to avoiding cold 850 RPM idling as much as possible and otherwise ignoring the noise? In speaking with the DOF installer, he said these noises come and go; change to a heavier oil; and don’t worry about it. He has installed 20 or more of these DOF’s and comes highly recommended by those I respect. FYI, the DOF manufacturer’s test suggests less than 2 psi of oil pressure drop and the change to 5 W 50 caused a PSI increase in oil pressure of twice that at idle and normal operating pressure. Thanks in advance. Bob Jones
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Bob Jones’ 2002 Porsche 911/996 Engine Tapping Issue I know this is sort of a repeat of my previous thread but the following includes some updates and additional information that may help ferret out some suggestions or solutions. January 21, 2017 bought car with 48,484 miles on odometer. February 16, 2017, with 49,595 miles, had new IMS bearing and Direct Oil Feed Line installed. About mid April, with 52,665 miles and warmer weather, noticed significant tapping noise at idle of 850 RPMs on cold start up . Sometimes on cold start the RPM’s are 1100 and there is no tapping, but when it warms a bit and the RPM’s drop to 850 the tapping begins. Tapping noise stops if RPM’s are raised to 1K; or, car is driven about 3 miles; or 180 degree operating temperature is reached. I can't really tell exactly where the tapping noise is coming from but to me, based on my experience, the noise sounds like a lifter that has bled down during the cool down period. So on July 7, 2017 the 0 W 40, Mobile 1 oil was replaced with 5 W 50, Mobile 1 Oil, and the tapping appears to be not quite as loud. The engine overall appears quieter. Another thought is it might be a bad bearing in one of the belt driven accessories, ie. alternator, A/C compressor, etc. Suggestions??? Maybe go to 15 W 50 Oil??? Something else ??? Thanks in advance.
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Many thanks to you all for your input. The filter is Porsche OEM. Today at 82 degrees F, and after the car had sat for a couple of days, I started it up and let it idle till it reached Norm op temp. I did not time it but it was probably 8 minutes or so. Till it reached op temp I did hear some ticking noise, but I guess I would not consider it particular loud, sort of VW Beetle sounding that I've heard in the past. It did not seem as loud as the past time or two At op temp that went away and all sounded fine. Remembering it's a 15 year old car with 54K maybe I am just being too sensitive to noises. It's our first flat six car so may have to just get us to it. Who knows??? haha Again, thanks for the input. bj
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Many thanks, bj
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Many thanks for the reply. In general it occurs after a day or more between start ups. Has occurred on the same day when very hot outside and after the engine cools for say 3-4 hours. Your view of using a heavier oil? Your view of the 10 W 40 Mobile 1 High Mileage Oil? It is A3 qualified. I had a long conversation with a Mobil 1 Tech Rep in Texas and he did not advise against it. I don't see a 5 W 40 on the Mobile1 list but there is a 5 W 50 on their list. Would you try a heavier oil? If so which one? Thanks bj
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January 21, 2017 bought car with 48,484 miles on odometer. February 16, 2017, with 49,595 miles, had new IMS bearing and Direct Oil Feed Line installed. About mid April, with 52,665 miles, with warmer weather, noticed significant ticking noise at cold start up. Noise continues until engine gets somewhat warm, at about 3 miles, then quits. Oil is fresh Mobile 1, 10 W 40, using Porsche oil filter. After researching, options appear to be: Use a thicker oil. Owners manual calls for 10 W 40, 15 W 40, & 15 W 50 as options; maybe try Mobile 1, 10 W 40, Hight Mileage oil? Try Liqui Moly Hydraulic Noise Additive? Try Liqui Moly MOS2 Oil Additive, or both? Have read all the posts I can find so far…All input and suggestions appreciated. Thanks in advance. Bob Jones, Raleigh, NC