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01-22-2021, 05:46 AM | #1 |
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Bought a 2012 M3, do I need to replace the rod bearings?
I have no issues at the moment, the car had 42,000 miles on the clock.
Do I need to change the rod bearings now to prevent any future problems or if I have no issues just leave them alone? How would one know if he has problems anyway? are there any signs that would prompt you to have them checked? I did hear that BMW improved the rod bearings in 2011+ models but I'm not sure |
01-22-2021, 06:52 AM | #2 |
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Yes.
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Super Spartan1551.50 slcook541863.00 |
01-22-2021, 07:09 AM | #3 |
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BMW removed the lead from the rod bearings in 2011. The clearance issues still exist. So like tdott said, yes.
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01-22-2021, 11:51 AM | #5 |
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If you have issues it's probably too late. You need to decide if the low chance of engine failure is worth the cost of a rod bearing replacement to hopefully prevent the failure.
If you're always going to worry about your engine it's probably worth the peace of mind to get bearings in that fix the clearance problem so you can enjoy the car. |
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01-22-2021, 12:21 PM | #6 | |
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01-22-2021, 12:41 PM | #7 | |
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01-22-2021, 12:41 PM | #8 | |
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When a rod bearing dies, the first time you hear about it is when the engine starts knocking or seizes. By then it's too late, you need a new engine. No one has any issues with their rod bearings until all of a sudden they do. Think about it like a sudden heart attack. There are no signs of any kind to 'check' The 2011+ models have 'different' bearings due to a legislation change in Europe but no noticeable difference in terms of clearance If you lose an engine due to rod bearings you need to buy a new engine and get it installed, and also do rod bearings on that engine unless you are very intent on winning a Darwin award. On the other hand, you can buy BE bearings -the only ones I'd use- for under $1K and swap them yourself or pay a total of ~3k to get them swapped at a shop. I bought my 2013 new and changed the rod bearings at 30k. They already looked bad. Then I bought a used 2011 with 33k miles, those also looked bad. Do it or don't do it. If you don't, just be aware that it may be an expensive experiment. If you do, you pay 3k and sleep like a baby at night. |
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01-22-2021, 01:02 PM | #9 | ||
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01-22-2021, 01:06 PM | #10 | |
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01-22-2021, 01:27 PM | #11 | |
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1) https://www.bimmerworld.com/BE-Conne...rings-S65.html = $590 for the set of 16 then I notice at the bottom a recommendation 2) Genuine BMW Connecting Rod Bolt - E60 M5, E63 M6, E9X M3 = Do I need one of those or 8? and what about this? 3) BE Bearings-ARP Connecting Rod Bolt Set - E90/E92/E93 M3 = Do I need this too? does buying one include the entire set? |
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01-22-2021, 01:34 PM | #12 | |
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The main difference between 2) and 3) is the OEM bolts have a *very* complicated torquing process and are single use whereas the BE-ARP just get torqued to a value. If a shop is doing the work, getting BE-ARP bolts minimizes the possiblities for them to screw up (you think they're going to dump a oem bolt they've torqued wrong?) and helps them go faster If you are doing the work yourself, the BE-ARP ones are worth their weight in gold. When you do this job, there's oil dropping on you, there's stuff hanging all over the place and you're covered in plastic sheeting so you don't get caked in oil. The last thing you need is to be doing step 8 of the 9 steps PER BOLT for the OEM ones and screw up, then have to start again. |
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01-22-2021, 01:40 PM | #13 |
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Thanks a lot guys! Y'all are a GREAT help!
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01-22-2021, 01:46 PM | #14 |
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No, not yet, i have the engine sitting in the garage. i am waiting to buy a new engine stand that is geared. Once i get that ill pull the bedplate and see if the main bearing failed and blocked oil to the rod bearing. I was also running a full e85 tune, I am thinking that Its possible it corroded the injectors causing them to leak, diluting the oil causing the rod to spin.
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01-22-2021, 01:48 PM | #16 |
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Completely up to you Spartan. I know guys with 150K+ and never replaced, while some guys with 30K have had engines bricked because of wiped bearings. It really is a crap shoot unfortunately and a lot of people do it for peace of mind or when they are going S/C.
If you can find a reputable shop, I say go for it. I've seen prices as low as $2400 and up to $3500. Or have a lift in your garage and do it yourself... ;-) -Duke |
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01-22-2021, 01:56 PM | #17 | |
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If so, instead of wondering whether your original engine would still be alive had you not done rod bearings, perhaps the question is whether your rod bearing replaced engine would have survived had you not run an E85 tune in it
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01-22-2021, 02:51 PM | #18 | |
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01-22-2021, 02:53 PM | #19 | |
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01-24-2021, 02:39 AM | #20 | |
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01-24-2021, 09:32 AM | #21 | |
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There are a few gaskets, o-rings, the engine mounts, etc that have part numbers there. |
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Davisca4552207.50 Super Spartan1551.50 |
01-24-2021, 01:41 PM | #22 | |
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I think the point made about finding a shop that has done the job many, many times is the only way I would have moved forward. Even if the shop has BMW master techs, I would search for a shop with the very specific experience of rod bearing swaps on the S65. I know guys have done the swap in their garages over a weekend will claim it is a tedious but straightforward job but somethig about it must be complicated because this isn’t the first example of “fixed” motors popping. Just wish their was a real fix to the issue. |
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