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10-12-2019, 08:42 PM | #67 |
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Awesome write up!!! Thx!
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10-15-2019, 12:51 PM | #68 |
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So, like $4000 minimum in labor if you were to find someone to do this?
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10-15-2019, 05:09 PM | #69 |
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Probably depends on labor rates.
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10-17-2019, 10:15 AM | #70 |
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At least. We won't do mains in car, and we don't recommend doing them as a preventative measure. So, every main job we've done for a customer has been due to bearing failure, which means the engine is fully disassembled and rebuilt.
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11-10-2019, 02:29 AM | #71 |
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Hey dean,
So here I am finally redoing the timing on all 4 cams, and I noticed something that wasn’t in your write up, and I’m pretty sure I didn’t do on previous go arounds... the TIS actually says you’re supposed to oil the cam bolt threads?!? That’s a huge difference as the torque would be insanely different wet than it would be dry! https://www.newtis.info/tisv2/a/en/e90-m3-lim/repair-manuals/11-engine/11-31-camshaft/5g1Ql4h It says in the spec column specifically: “Screws oiled at threads and heads” Have you ever oiled the threads before torquing those bolts? The main TIS page doesn’t actually mention it under the procedure itself, but it does point you to the page I linked above for “more details”. I’m not actually sure how to proceed right now as I’m mid-procedure and wanna close this engine up tonight! The repair instructions can be so frustrating some times!! Oiling the threads will make such a drastic difference in torque that I’m hesitant to do it unless everyone does it. Thanks! S. |
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11-10-2019, 06:17 AM | #72 |
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I went with oiling them. When I pulled out the old bolts they were covered in oil, so I might have oiled them before (it’s been a while), or they might have gotten oil on them as I pulled them out.
I checked the S85 manual and it says oil them too, so I would recommend adding that to the initial post as it’s somewhat buried in TIS. Thanks! S. |
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11-10-2019, 09:37 AM | #73 | |
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11-28-2019, 07:54 AM | #74 |
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How quickly do those bore sizes increase with just a very small amount of honing? The main bearing shell crush decreases significantly as the engine warms up.
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11-28-2019, 08:17 AM | #75 | |
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The color coding system is simply the manufacturers method of sorting and classifying the result of manufacturing variances in order to simplify the selection process. If you didn't have the equipment to accurately measure crankshaft journals and inside diameters of assembled bearings to determine operating clearance you could just take his word for it and select according to color. IIRC putting two reds together will give you the most clearance while putting two blues together would yield the tightest clearance. Tight will get you in trouble before loose will! |
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11-28-2019, 09:07 AM | #76 |
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Good write up. Dean did work on my vehicle while I was transitioning between homes and had no garage to work in. He completed the rod bearing replacement for me and documented every step and measurement. He was by far the most methodical mechanic I've come across. Would definitely do business with him again.
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05-07-2020, 08:56 AM | #79 | |
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05-07-2020, 10:16 AM | #80 | |
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Quote:
1) If you look at the diagram below there are three bolts to remove the Timing Cover. However there is no notation to designate the middle bolt. Is the middle bolt a 14 (M6X30-U1) or a 15 (M6X25-ZNNIV SI)? 2) What is the torque spec on these bolts, can't find this information anywhere and am pulling my hair out. Thanks! |
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05-07-2020, 11:23 AM | #81 | |
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https://www.newtis.info/tisv2/a/en/e...ine/1VnYrHsDMb The realoem diagram answers your question. First, there are four screws per the "qty" column, not three. (2ea x2 cylinder heads=4 total) The drawing does depict which screw goes where. #14 (M6x30) shows applied to the top two holes in the cover. #15 (M6x25) shows applied to the lower two holes in each cover. The holes on the top of the vanos cover are obviously applied via the valve cover and are unique to the application of the valve cover, so you'll find the torque values in the cover detail. (8AZ here): https://www.newtis.info/tisv2/a/en/e...th-lid/5VFC6oU |
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05-07-2020, 12:09 PM | #82 | |
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05-07-2020, 12:59 PM | #83 | |
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BMW has specific instructions for a multitude of things that hobbyist DIY's overlook or disregard. But 10nm is typically considered safe for M6 hardware. |
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06-09-2020, 05:00 PM | #85 |
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06-09-2020, 05:13 PM | #86 |
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I confirm I can see the images
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06-10-2020, 12:30 AM | #88 |
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Well, it is car porn...
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