07-05-2023, 04:30 PM | #23 | |
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1) torque spec is 25 NM not 18nm. 2) you need to use a brand new copper crush washer. If you reuse an old one it won't be able to crush down any further and seal properly. You will also risk stripping the threads again if you keep sinching the bolt tighter to stop the leak. This is a major cause of stripped bolts in the first place - reusing washers or using crap washers. 3) you should replace the old bolt, the threads on that could be damaged from stripping the pan - unlikely because it's steel and much stronger than the aluminum pan. But it's possible. 4) a helicoil is technically a permanent fix, not a temporary one. Especially if you do it right. I personally don't like the idea of tapping up to m14 because you'll be removing a lot of material from an already thin side wall. Also the side wall has a notch in it making it even weaker.
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07-06-2023, 01:33 AM | #24 | |
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07-06-2023, 01:50 AM | #25 | |
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You can remove the tang via thin needle nose pliers.
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07-06-2023, 02:46 AM | #26 | |
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Sorry, the question was not well posed. I wanted to know what length of helicoil you used, 0.5D-1D or 1.5D because the longer it is, the less oil comes out of the cap during an oil change. |
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07-06-2023, 02:57 AM | #27 |
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1D no longer than this or else you will have excess coil sticking into the oil pan. The reason why is because the stock drain bolt is 17 mm, 1D = 12 mm, and you want the longest insert possible for maximum strength when the bolt is torqued down.
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12-13-2023, 10:56 AM | #28 |
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Do you have a write up on this? Definitely interested in trying myself if I have the right guidance lol
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12-13-2023, 02:38 PM | #29 | |
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I'm planning on adding sections telling you what tools to buy (just the sizes so you can buy whatever brand you like, aka I'm not shilling to make a few dollars off of affiliate sales) and I'll be explaining what sizes to use. The only issue is grease where I can only describe the consistency you need to get, but can't tell you the brand because I'm using some discontinued moto master grease only available in Canada. And that's what everyone always asks me for and I can't help with, so you'll have to go to your auto parts store and look around till you find one.
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12-17-2023, 08:23 AM | #30 |
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Hey,
On the last oil change, when tightening by hand fairly lightly, the bolt went loose. I left it and haven't had any leaks. Fearing the worst on the next oil change I stumbled across this thread and many others. While researching what I'm in for I decided to call my dealer and they stated BMW came out with a fix / kit since this has happened so many times. They are going to tap in a larger thread, that would require a slightly larger bolt, vacuum from the top just in case for shavings, and flush a few quarts of oil through for any possible missed shavings. The total would be $350 and take approximately 1.5 hours. Can anyone speak on this fix they are proposing? Thanks Last edited by savannahz; 12-17-2023 at 09:36 AM.. |
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12-17-2023, 03:13 PM | #31 | |
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Also what does the dealer mean that'll vaccum it from the top? I've seen this done on Mercedes engines but it's not effective at all on bmw motors.
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12-17-2023, 04:50 PM | #32 | |
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To be honest, I was just happy BMW had acknowledged the issue and supplied a fix. I was thinking $3500 based off my reading. Thanks |
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12-17-2023, 06:41 PM | #33 |
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12-17-2023, 07:15 PM | #34 |
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That's not quite accurate, helicoils use STI (Screw Thread Insert) threads to tap the original hole not standard metric threads - this means you'd tap an m12 x 1.5 STI thread, and the size isn't exactly m14 it can range based on the tolerance of your tools.
The max pitch depth of the sti threads can vary, IIRC helicoil says it can range from a min of ~13 - ~14.1mm. So the hole truly isn't 14 mm it is in the ~12.3 mm range (size of the drill bit helicoil generally supplies to drill out the stock threads, but technically the spec according to helicoil is 12.25mm), but the thread width can go as wide as 13-14mm depending on the tolerance of the sti tap. This still retains more material than an upsized m14 bolt which requires you to bore the hole to 1/2" or 12.7mm (but this probably has a tolerance to it as well depending on your drill bit) and then tap it with an m14 standard tap (an m14 bolt can be 13,962 mm wide as it's max major diameter according to iso standards, so the tap is going to have to be a bit wider than that just to ensure fitment with even the widest of all m14 bolts), so the widest thread will still be a bit wider than the helicoil approach. Personally I think the helicoil approach is better, because the initial boring takes alot less material which gives it the highest chance of success (not having the wall crumble or crack) - especially with how thin walled these oil pans drain holes are (so this is probably the biggest factor in play). This also plays into effect when you are tapping as well - the thicker the wall the stronger it is and less likely to crumble or crack. Then with a helicoil you can reuse the same drain plug and the same washer which is always nice.
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12-28-2023, 01:19 PM | #35 | |
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01-05-2024, 10:16 AM | #37 | |
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Do you have a photo of the inserted Helicoil seen from the oil cap side to see how far it needs to be inserted to avoid leaks? |
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01-05-2024, 11:57 AM | #38 | |
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Ok I'm terms of how deep you have to set the helicoil you can make it so it's flush, then go about 1/2 extra turns deep so it's a tiny bit recessed. Just a tiny bit is enough don't go too recessed. Then before you remove the tang from the helicoil you can put the copper drain washer against the hole and confirm it can sit flush. If it does then you're good. The sealing is mainly done by the head of the bolt crushing the copper washer against the oil pan, so I'd the washer can sit flush everything should be leak free.
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01-05-2024, 01:31 PM | #39 | |
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01-05-2024, 02:22 PM | #40 |
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I see, ok so like I said before make the coil flush with the surface of the pan, then go in an extra half turn or so and check with the washer to see if it sits flush. I don't have any images from users because no one has bothered to send me any.
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04-25-2024, 06:39 AM | #42 | |
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Thank you so much in advance |
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04-25-2024, 02:25 PM | #43 | |
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04-25-2024, 02:28 PM | #44 | |
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If not i totally understand, thank you again for the advice you've already shared. Taken so much stress off my plate. |
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