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09-17-2013, 10:29 PM | #67 |
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09-18-2013, 09:28 AM | #68 |
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25psi is the minimum I would want to see. I have had mine to 240ish and it still was at 32 at idle.
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09-18-2013, 10:52 AM | #69 |
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I have the journal measurements of an S85 (same spec as S65)that I worked on last year. All journals were as near as makes no difference 51.982 diameter. This car showed no abnormal signs of wear at 78k miles, so the old shells went back in.
I also have a new pair of rod bearings in front of me. They are measuring: .0785" (1.9939mm) in the centre of the blue 703 bearing, .077 ish near the split .0783" (1.9888mm) in the centre of the red 702 bearing, with .077" again near the split. Assuming the rod was at mid limit of 56.007mm, this would give a clearance value of .0016" (.042mm) at 90 degrees to the split line. Clearance at the split line oval bore would be .0044" (.11mm) This clearance seems fair enough for an 8,400rpm motor when allowing for rod stretch. What concerned me about the bearings is the split lines aren't as flat as they should be. Any good engine builder will wipe a fine stone across the splits before assembly to remove slight burring and subsequent distortion. Was this done at the factory assembly stage? Both bearings are identical apart from the .0002" thickness reduction. Why do the blues cost 50% more? Different material? The crank that I measured gave good clearance out of the box. If the journals had been ground to top limit and used with a rod set at bottom limit, clearance would be close to .001" It would be interesting to see a log file of actual journal measurements from anyone who has the opportunity to mic a crank Could the sporadic nature of this problem be down to one bad assembly worker Last edited by Yellow Snow; 09-19-2013 at 03:32 AM.. Reason: Mistake on size |
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09-18-2013, 11:12 AM | #70 |
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Those bearings (703/702) look like the aluminum bi-metal type?
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09-18-2013, 12:47 PM | #71 |
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Previously, I've posted journal measurements on three different cranks journals. Mics were 0.00005 accuracy. I don't have the links handy at the moment, but they shouldn't be too hard to find. This weekend I'll be finalizing some of the latest measurements with my engine builder and then will be posting the full set of measurements next week on an engine we disassembled a week ago. Regarding blue/red rod bearings. I don't think anybody here has posted a definitive answer yet. BMW engine builders swear they are different bearings (upper/lower). Here's something I found on another site. Using a clean-room wipe and isopropyl alcohol, carefully clean each rod bearing (see Photo 4). Install each bearing into the rod cap and rod half. Depending upon which engine you have, there may be upper and lower bearing shell halves (blue for the top side and red for the lower side near the rod cap).http://www.pelicanparts.com/bmw/tech...d-Bearings.htm I hope this helps... |
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09-18-2013, 01:57 PM | #72 |
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Seems I need to visit here more often. Missed this thread, but tagging along now.
I have a set of bearings in-hand for swap in my S85 in a couple of weeks. I'm doing this as a preventive item in-car, so the discussion of the oversized bearings now has me wondering. If you (anyone here) were given the choice of .25mm oversized bearings and TWS or original spec and 0W-40, which would you go with? I'm not going to lie, I was looking forward to $60 oil changes... Combine that with a 5 mile round trip work commute and Maine winter temps, am I out of the box to think the oversize bearings are the real solution and the Mobil1 0-40W is my winter oil of choice and TWS when the snow tires come off? |
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09-18-2013, 02:01 PM | #73 | |
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09-18-2013, 02:33 PM | #74 | ||
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09-18-2013, 05:48 PM | #75 |
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I have consistently had bad UOAs. My oil is showing significant levels of copper, signifying that I have worn into the intermediate layer. Also, I think it is beginning to develop a tick. I need to listen to some cars to make sure what I am hearing is not normal though.
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09-18-2013, 11:06 PM | #76 | |
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09-18-2013, 11:52 PM | #77 | |
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09-19-2013, 01:02 AM | #78 |
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I could send you the 090/091's oversize bearings early next week. I assume you don't need the 088/089's...right? We have plans for the 088/089's to have them "treated" to see how the thickness changes.
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09-19-2013, 01:11 AM | #79 | ||
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09-19-2013, 03:30 AM | #80 | |
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Sorry yes, my mistake they are a nominal 52mm. I have figures noted here at -.018mm, so I should have said 51.982mm. I will edit. That's what I mean about the bad builder. If they mixed a low end tolerance rod end with a high end tolerance journal things will be getting tight. Mix that with a distorted shell and it's not good news |
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09-19-2013, 08:20 AM | #81 |
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One of the local master technicians met with the senior /// engineer from Germany. The word is that BMW acknowledges that there is bearing issue due to tight clearance. But BMW will assess each failure on a case-by-case basis and extend a goodwill warranty cover. The catch is that, the car must have an ongoing dealership service history, at least oil changes, to confirm factory spec oil and filter have been used each time. If this is the case, regardless of the miles or years, BMW will help owners out.
I've heard this from a very reliable third party. I am just putting it out there for information only. No flame please. Also the same /// engineer was quoted saying, hang on to the ///3s with S65 engines because it's last of the /// cars with /// DNA and built at the /// centre (I don't know much about this one). All current and future /// cars including 3, 5 and 6 will be series builds along with other non-/// cars.
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09-19-2013, 08:42 AM | #82 | |
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09-19-2013, 08:43 AM | #83 | |
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09-19-2013, 08:49 AM | #84 |
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I've just got a quote for bearings change A$3500. My car is coming up six years and has done 39k km, and in the process of the change if bearings are on the way out, it will be a warranty claim and I don't have to pay a cent. I am still toying with the idea of outlaying that kind of money for the same bearing and the headache to resurface in a few years time. But the upside is, I might get the job done free even for a few more years of headache free driving.
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09-19-2013, 08:53 AM | #85 | |
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I am in the same boat with regard to the servicing. The car hasn't seen the dealership since it went out of warranty. But I am thinking now, whether I should take it for an oil service every now and then just so that they have a record of oil visits.
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09-19-2013, 09:21 AM | #86 | |
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09-19-2013, 09:36 AM | #87 |
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09-19-2013, 09:37 AM | #88 | ||
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