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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Drives: BMW 335i F30
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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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