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07-29-2021, 04:36 PM | #1 |
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Cracked Vanos Hub Cover
Figured I would draw some attention to this issue as a preventative measure.
Recently the car requested an additional litre of oil and after adding some I decided to have a look into the motor through the fill cap. I immediately noticed a cracked plastic piece on the intake vanos hub/gear. If you want to check this yourself, you may have to turn the car on an off a few times for the vanos hub to spin fully to inspect the entirety of the plastic cover. Essentially what happens is the plastic covers for the vanos hubs can come apart, whether it’s age or mileage related I’m not sure, and the plastic will be shredded by the vanos gears and returned to the oil pan. Naturally, as the plastic pieces accumulate in the oil pan, the oil pickup begins to clog and starve the motor. For those unfamiliar, there is an intake and exhaust/outlet vanos on each side of the motor. To inspect the drivers side bank, the valve cover must come off. Based on my research, the covers are removable, but it is not advisable to drive without them as they aid in retaining the springs on the front of the vanos hubs. There are a handful of threads on this forum that deal with this issue. The covers are not available separately and the entire hub must be replaced once the cover shows signs of cracking or other damage. The parts are roughly $1000 USD each and the dealer charges 13 hours to install all 4. With that being said, the 2 people I’ve talked to have indicated that the exhaust/outlet vanos hubs do not seem to suffer the same failure as the intake side, and as such, only 2 typically need to be replaced. Some of the information provided by deansbimmer suggests used units only be sourced if you can confirm that the motor they are removed from did not incur a bearing failure, as the metal can enter the vanos hubs. I’m sure I am forgetting some things but will update this accordingly. The first photo is my personal vehicle, the second and third were sourced from a Facebook group. Last edited by Etansinsta; 07-30-2021 at 10:51 AM.. |
07-29-2021, 05:48 PM | #2 |
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Dinan will make replacements plates out of steel. Bert had them do it on his Flat Plane Crank motor. Call them, and call it a day.
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07-29-2021, 06:04 PM | #3 |
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Wow that looks terrible. I have a couple of these gears on my desk as paperweights, with the plastic covers. The covers seem cheap and flimsy.
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07-29-2021, 06:25 PM | #4 | |
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For the time being im replacing them with low mileage units taken off of a stroker build, but interesting suggestion for future thought. |
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07-29-2021, 06:26 PM | #5 |
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07-29-2021, 09:03 PM | #6 |
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Good stuff. On a whim I went to check out mine and it looks like I'm part of the cool club.
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07-29-2021, 11:10 PM | #7 |
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A lot of measurements must be taken on 292 cams in general, and the flat plane cams specifically because they have more lift than normal 292 cams. Once the measurements are done at the various opening and closing angles, then you know how much range you can allow in your VANOS. If you're range limited, then block-off's can be put in place to limit the range. I don't know if that had to be done, or not, on the flat plane engine. But yes, the flat plane engine will have VANOS.
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07-30-2021, 06:56 AM | #8 | |
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Any advice would be appreciated!! |
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07-30-2021, 07:08 AM | #9 | |
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07-30-2021, 10:50 AM | #10 | |
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I think the DIY is tedious, and you need the cam lock tool and s65 timing tool. Based on the costs of that alone in CAD$, it makes more sense for me to pay a shop! Please keep us posted if you attempt the DIY! |
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07-30-2021, 10:56 AM | #11 | |
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Just make sure there's no reverse torques on any of the hardware.
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07-30-2021, 02:02 PM | #12 | ||
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07-30-2021, 02:05 PM | #13 | ||
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07-30-2021, 04:00 PM | #14 | |
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I actually have elected to park the car until its dealt with. clogging the pickup doesnt seem like something im interested in experiencing lol on the otherhand, i reckon if you drive it carefully, the crack will not get much bigger. |
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07-30-2021, 04:04 PM | #15 | ||
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You have a plan of attack yet? |
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07-30-2021, 04:53 PM | #16 | |
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When they get here, the local shop has advised it will be 4.5 hours to replace the one cracked one. Will also be having them replace the valve cover gasket on the drivers side at least, just so we can have a peek in bank 1 at the VANOS hub. |
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07-30-2021, 07:38 PM | #17 | ||
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If I go that route, mind if I PM you for the info of where you got your used gears? |
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07-30-2021, 08:32 PM | #18 | |
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I know mporium on eBay is clearing out a few sets. Presumably the man ado int against used ones from blown motors wouldn’t be selling gears from blown motors. Worth reaching out to them at least to see what they have to say! |
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07-30-2021, 10:10 PM | #19 |
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Is it possible to check oil pickup when changing oil, using a boroscope?
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07-31-2021, 06:46 AM | #20 |
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I experienced the problem on my old engine. As I replaced my cover gaskets, I noticed that one of the plastic covers had turned slightly and had popped out of its slot. So I replaced the actuator. Do not drag the consequences can be serious
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07-31-2021, 07:37 AM | #21 |
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07-31-2021, 07:40 AM | #22 | ||
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