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BMW 3-Series (E90 E92) Forum
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UPDATED - Engine Swap - 335D Crankshaft Main Bearings and Bolts Question
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01-15-2019, 09:44 PM | #67 |
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Well, still don't have the car back.
After the pan was dropped, the shop found the rod bearings in good shape. Next was to check the timing chain. According to them the chain was stretched. So we proceeded to replace the chain along with associated parts. This past weekend everything was put back together and upon testing the shop could still hear a noise, not as bad as before. They dropped the oil pan again and find that the main bearing closest to the crank pulley has spun. Why they wouldn't check the main bearings the first time I don't know. Problem now is that we can't find the end caps. They are not sold by themselves, only as part of the block. It's part # 7801415. Searching for parts now. What do you guys think about this? Seems to me they should have checked more carefully before proceeding with the costly timing chain replacement. |
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01-16-2019, 07:02 AM | #68 | |
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Regarding the end caps, you are correct in that they are not sold separately. Back when I went through this issue I basically had two options after speaking with Matt Whitbread. Option 1 was to replace the entire engine. Option 2, IIRC, was to laser weld more material onto the end cap so its back to its original smooth thickness. The issue with option 2 is that the end caps aren't cast by traditional methods like pouring molten metal into a template/form. They are supposedly made from fine metal powder and then subject to high heat and pressure until all the particles fuse together (cant recall the technical term for this process). While possible to weld more material onto the end caps, its supposedly not 100% reliable. Depending on how bad your bearing spun, you might be able to get away with sending the crank and end caps to a machine shop to reprofile the parts and then put in oversized bearings to compensate for the lost material. Do you have any pictures of the bearing and end cap? Also, how many bearing end caps do you need? I still have my old engine and may have a few good ones. |
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01-16-2019, 07:21 AM | #69 | ||
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If you have a few good ones left, I'll take em. I will ask for pics of the caps today from the shop then throw them up. |
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01-16-2019, 07:25 AM | #70 | |
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I'll try to snap a few pictures today and send them over to you. Did your shop inspect all the bearings? Just want to make sure you dont need more than just one. If it turns out you need, say 3, and I only have 2 good ones then I'd assume the two would be of no use for you. |
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01-16-2019, 07:50 AM | #71 | ||
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Only the first one was bad. I'll take both of yours if they are good. How quickly do you think you can get them sent out? |
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01-16-2019, 08:15 AM | #72 |
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The engine is at my mechanics shop right now. I'll be headed there after work today if plans dont change. I'll see exactly how many I have left and take a few pictures so you can decide yourself if they will be useful. If you like what you see, I could have them shipped either tomorrow or Friday. Sounds like you might be in a hurry so we could do USPS priority mail for 2-3 business day delivery unless you want to do something more expensive like next day air.
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01-16-2019, 08:16 AM | #73 |
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Also, double check with your shop if the bearing end caps are interchangeable between the mounting points.
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01-16-2019, 09:13 AM | #74 | |
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Do you have any pics? Here's mine |
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01-16-2019, 09:30 AM | #75 | |
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Did the shop inspect the crank for any damage? |
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01-16-2019, 09:41 AM | #76 | ||
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I see the picture of 2 caps. Are these the good ones? |
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01-16-2019, 09:46 AM | #77 |
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The first/top one is scored from the bearing. The second one looks a bit better but I wont know until I check. I'll take a look at what I have left at the shop and let you know.
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01-16-2019, 09:52 AM | #78 | |
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01-16-2019, 03:58 PM | #81 | |
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Had I known a main bearing had spun after they dropped the oil pan the first time, I may have gone a different route but since they have already replaced both chains, CBU cleaning, replaced the plugs and module I'm too deep to try getting an engine replacement. |
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01-16-2019, 06:10 PM | #82 | |
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01-16-2019, 06:40 PM | #83 | ||
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01-16-2019, 06:58 PM | #84 | |
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01-16-2019, 07:00 PM | #85 |
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Seeing as the caps are numbered, I think they might be. But I think they are numbered because of how they are profiled to the individual crankshaft position as opposed to a different shape. From the outside, they all look the same.
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01-16-2019, 07:07 PM | #86 | ||
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bearings, bolts, crankshaft, wear |
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