03-21-2024, 09:41 PM | #45 | |
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just buy the two sprocket bolts (one time use), set the timing using a dial indicator, and slap the valve cover back on. its only a 3hr job. i did it like 5 times |
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03-25-2024, 09:41 AM | #46 | ||
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Thanks for the explanation on the biasing. I will try to do that as well. |
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03-26-2024, 03:33 PM | #47 |
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Alrighty, I have the valve cover off and am checking things out. As I understand it, while the engine is off, the cam adjusters should lock in place if I rotate manually. So that is one failure mode to check, assuming things appear to be in time- try to rotate cams while locked in TDC. If there is movement, an adjuster has failed or at least stuck. After ruling that failure mode out, if I remove the TDC pin and rotate by hand and it stays in time, should I pin it again and remove the exhaust Vanos adjuster sprocket and see if it is worn internally? I found a video and it does not look very complicated to disassemble.
I got excited at first because when I popped the valve cover off the cams were slightly out of alignment (amazingly the engine was just behind TDC already) but I think once I manually advanced the engine to pin it, the cams fell back into correct TDC position, which makes sense as last time I had the engine running it probably was adjusting timing and then when I turned off the car things slide a bit. Then presumably when you start it, both units should pop into 'locked' position on those adjusters. Hope that all makes sense. I am set on learning how this works and fixing it in a logical order. I am confident I will get it running properly. |
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03-26-2024, 05:06 PM | #48 |
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I am waiting for my timing tool to come in. I checked with my n52/n54 tool (as much as I could) just to see how things are looking. I’m 100% positive I’m in the correct TDC as I found it visually with a scope, also with a screwdriver, and it is nice and locked with minute play.
I also made sure the chain tension is “tight” against crankshaft and then between both cam adjuster units/cogs. I am finding the exhaust camshaft to be slightly in retarded position. It’s hard to tell in my photo, but the intake side of the alignment tool goes on, the exhaust isn’t aligned enough to slide down. Have I found the issue (slight timing loss, probably from belt wrap) or should I be looking at a replacement VANOS adjustment unit? I think it’s locked in, but somewhat hard to tell as obviously if I try to advance it I just introduce slack into the chain. |
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03-26-2024, 08:23 PM | #49 |
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Don’t be fooled if the cams are not perfect when you slide on the tool. They should be moved into place.
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03-26-2024, 08:42 PM | #50 | |
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03-27-2024, 11:14 AM | #51 |
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Its really simple to take apart the vanos unit. If you are in the engine already, might as well rule that out. The only “hard” part will be putting the spring back on afterwards. It only took me a couple minutes to do it by myself, with just a pair of pliers. If you will take it apart, check if it is full of oil.
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03-27-2024, 05:31 PM | #52 | ||
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Thanks to your photo from ISTA, I may be eliminating the possibility of timing being off. It is super close to sliding on and I could definitely force it. This is after turning the engine over one full revolution to see if the VANOS unit was bound or anything since the chain would go slack if I tried to advance it. Quote:
At this point (thanks to the above ISTA screenshot), I am thinking (hoping!) it is the VANOS unit. If not, I guess I am going to have to pull the exhaust camshaft shell off, which I would love to avoid... |
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03-27-2024, 06:35 PM | #53 |
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Correct. It SHOULD be full of oil. From what I understood, your code is for vanos being stuck, not your timing being off. I’m wondering if either some oil line is still clogged or the vanos unit itself is bad. Did you check your oil filter housing cage? If the cage or the small o-ring is missing, that could also cause the vanos not to work properly.
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04-01-2024, 04:00 PM | #54 | |
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The unit made some weird sounds when I was unbolting it, so maybe it is hanging. The oil filter has the proper cage and o rings... Hopefully it isn't ledges. Is it possible that timing being slight off can throw the exhaust sticking code? |
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04-02-2024, 09:23 AM | #55 |
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If your car had a problem with timing, you would have gotten a code that the timing is advanced or retarted with respect to the crankshaft(or any timing-being-off related code). The code that you are getting is related to either the vanos unit itself being bad, or not enough oil pressure for the vanos unit to operate properly.
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05-16-2024, 08:48 AM | #56 | |
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In my case, a new (used OEM) exhaust VANOS unit fixed my problems! I was very careful when I timed it as well using tips listed above. Cheers. |
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06-10-2024, 12:08 PM | #57 | |
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Hi stu. If you can help me I have a m235 2016 with exactly the same problem. In the automatic flywheel there is just one hole that the pin completely enter isn't it? The hole next to the tdc one the lock pin didnt enter completely. |
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06-18-2024, 08:29 PM | #58 |
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Sorry I haven’t been on. Did you get it resolved?
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06-18-2024, 09:12 PM | #59 |
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In my experience, it is highly preferable to use an endoscopic camera for this. Even a cheap Amazon one works for the task. It will be obvious once you peek in there if you have the correct locking position or not. Best of luck on fixing your car!
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06-26-2024, 08:46 PM | #60 |
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07-03-2024, 01:13 PM | #61 |
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I was thinking my dme was an issue too. Sent it away to be tested. It was fine.
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07-03-2024, 01:16 PM | #62 |
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If anyone wants a new exhaust sprocket i’ll sell it for the same price as a used one. It’s no good to me.
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07-07-2024, 05:20 AM | #63 |
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https://www.bimmerpost.com/forums/sh...php?p=31282019
Yesterday just solved the problem. Changed de teflon Orings. Both, intake and exhaust erros solved. I measures the old teflon orings and, the intake size they were thiner 0.03mm than the new one. Another common error that does not cause this type of problem but may be linked is that my roller drag levels , they were all changed. those numbered 1 to 5 are to be used on intake cam. The non numbereds or number 6 on the exhaust cam. |
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07-08-2024, 08:51 AM | #64 |
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Congratulations. Very satisfying when codes are cleared!!
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08-20-2024, 12:56 PM | #65 |
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Fault Cam Installations
Hey Stu Blue Car, I have the same DPTool timing kit as you. I have error codes stating the intake and exhaust cam installations are faulty. I found in many posts and videos, people using the black DPTool bar for timing instead of the gold one that says for N55 Engine. I have tried both multiple times using yuptec's method and still get the same codes. Did you use the gold one or black one to get your engine timed?
For everyone, I am wondering if my timing chain needs to be replaced. There appears to be some slack in the lower right. There is a slight tick noise around 2,000 rpm but I can't tell if it is the chain making the noise. Taking the chain off to see if it is stretched is a mission so I don't want to take that on if I don't have to. Has anyone hear of the camshaft installation's being faulty due to a bad timing chain, faulty tensioner, or bad guide? |
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09-02-2024, 10:11 AM | #66 |
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I used the gold coloured bar. Once I used the dial gauge to prove TDC, it worked. I think that I kept going past tdc when i was doing it visually.
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