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06-23-2014, 04:05 PM | #2114 | |
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Send an oil sample to blackstone as soon as possible. These are starting to surface at local dealerships from what I've seen.
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06-26-2014, 06:49 AM | #2115 |
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Since we are concentrating on 08 models with older bearings specification, how come 2011's also have this with newer bearings?
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06-26-2014, 06:34 PM | #2116 |
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06-27-2014, 05:26 AM | #2118 |
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Anyone received solid confirmation on when the new 702/703 bearings where started to be used in the S65's?
Thanks Edit: And wether phase in of new while consuming old stock, i.e parallel production, or a clean cut date when new bearings was fully introduced into production. Last edited by Helmsman; 06-27-2014 at 05:43 AM.. |
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06-27-2014, 05:38 AM | #2119 |
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06-27-2014, 06:19 AM | #2120 |
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There is no hard data on when the lead free bearings were introduced.
There is the date set by the EU for certain exemptions from the RoHS regulations regarding lead in bearings (ended 2011 - july I think). There are the dates when the part numbers for the bearings changed (in Realoem) - different date for the top bearing compared to the bottom bearing shell. So really only BMW know for sure. There is no apparent improvement in reliabilty produced by the new lead free bearing type. |
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06-27-2014, 06:33 AM | #2121 | |
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06-27-2014, 06:55 AM | #2122 | |
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Maybe the bearings were changed due to some EU lead regulations - we will never really know. The point being they still seem to fail just like the old ones did even (maybe not as often) though they are about 3+ times stronger... Anyhow, this whole rod bearings business is a travesty on BMW's part... They should definitely goodwill engine replacements for proven rod bearings failures on stock cars with proper maintenance and driving patterns. |
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06-27-2014, 07:29 AM | #2123 |
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Makes total sense, BMW would certainly not agree that they changed to sort quality.
Still, one would think the dates for change and even background would slip out at some point... that day I'll be around with ears wide open... Another thing tha makes me wonder is that most bearing failures seem to be reported in N.A. Believe "only" around 50% of the cars went that way so still curious why we for instance don't get many (any?) reports in EU..? Maybe we're simply less active on the forums over here, but still strange. cheers |
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06-27-2014, 11:13 AM | #2124 | |
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06-27-2014, 04:04 PM | #2125 |
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A harder bearing surface is more likely to damage the journal in the event of metal to metal contact during cold starts and boundary lubrication conditions. |
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06-27-2014, 06:21 PM | #2126 | |
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In any case, the addition of a supercharger simply exacerbates the problem and makes it come to light sooner vs a non-tuned vehicle. |
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06-28-2014, 07:27 AM | #2127 | |
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06-28-2014, 08:16 AM | #2128 |
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06-28-2014, 08:57 AM | #2129 | |
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06-28-2014, 09:06 AM | #2130 | |||
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All M cars are manufactured in the same plant in Germany. Quote:
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06-28-2014, 05:57 PM | #2131 |
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Under the EU exemption, BMW would be allowed to have the older lead faced bearings manufactured for cars built before the exemption cut off date (July 2011)...unfortunately they don't seem inclined to.
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06-28-2014, 05:58 PM | #2132 |
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Just to add a data point.
I have my S65 installed in another chassis and the wiring is slightly different...so I have control over whether the fuel pump is on or not. I also have a mechanical oil pressure gauge installed so I can read actual oil pressure in real time. Since I replaced the bearings I have been cranking the motor til the oil pressure gets up to 40 psi. Then I stop cranking and turn the fuel pump on. As I am doing that the oil pressure drops to between 15-20psi. I do this to minimize wear during no/low oil pressure conditions. Just out of curiosity, I started it with the fuel pressure so it starts immediately. In this situation it appears that oil pressure is essentially zero for around 2 seconds, maybe a bit more (a quarter second) until there is 35 psi of oil pressure (initial spike is to 35 psi). It then takes about 2 more seconds to get to full oil pressure (around 85 psi). |
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07-18-2014, 02:58 AM | #2133 |
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Can someone smarter than me give me a hand with a question.
I though I had a bearing issue, took the bearings out (2010) and the part number says 088 089 (not sure if that should be 088/089). I had 16 of them in my factory engine. The replacement VAC bearings I have are 702 703 (702/703). Now on the first page is says there should be different bearings for top and bottom, is that correct? |
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07-18-2014, 06:12 AM | #2134 |
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-702 is different from -703. One is for the top and one is for the bottom. You should have 8 of each. They are also distinguishable by color on the side, red or blue.
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