W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Supercharger oil coming out of front bolt

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Old Jul 7, 2019 | 04:16 PM
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Supercharger oil coming out of front bolt


I was at the track and noticed I had some oil coming out of the front bolt that holds the pulley on. It’s not from the bearing. Anybody have this happen before?

Last edited by E42AMG???; Jul 7, 2019 at 04:43 PM.
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Old Jul 7, 2019 | 10:16 PM
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There is no oil under that bearing, only grease. Your bearing is about to disintegrate on you. Pull the belt off and replace the bearing before you reinstall the belt. Be sure to get the supercharger clutch clearance correct. Shims available from Eurocharged.
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Old Jul 7, 2019 | 10:34 PM
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Originally Posted by bbirdwell
There is no oil under that bearing, only grease. Your bearing is about to disintegrate on you. Pull the belt off and replace the bearing before you reinstall the belt. Be sure to get the supercharger clutch clearance correct. Shims available from Eurocharged.
I was under the impression that if your supercharger oil is overfilled it could weep out of that bolt. I’m probably wrong but hopefully someone can clear that up for me
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Old Jul 8, 2019 | 12:16 AM
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Originally Posted by N_Rob
I was under the impression that if your supercharger oil is overfilled it could weep out of that bolt. I’m probably wrong but hopefully someone can clear that up for me
No, that happens.
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Old Jul 8, 2019 | 12:29 AM
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Originally Posted by N_Rob
I was under the impression that if your supercharger oil is overfilled it could weep out of that bolt. I’m probably wrong but hopefully someone can clear that up for me
You can't overfill the oil. It's a fill hole in the supercharger. You have to inject oil into the hole and if it is too much oil it will just come back out the same hole, just like the differential. The more oil you put in, the more oil that comes out.
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Old Jul 8, 2019 | 12:34 AM
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Originally Posted by bbirdwell
You can't overfill the oil. It's a fill hole in the supercharger. You have to inject oil into the hole and if it is too much oil it will just come back out the same hole, just like the differential. The more oil you put in, the more oil that comes out.
I thought up to the drain bolt was overfilled?? Now I’m confused haha. I thought the 150 mL level was way below the drain bolt and if it comes out of the drain bolt you’ve overfilled it already?
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Old Jul 8, 2019 | 01:03 AM
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Originally Posted by N_Rob
I thought up to the drain bolt was overfilled?? Now I’m confused haha. I thought the 150 mL level was way below the drain bolt and if it comes out of the drain bolt you’ve overfilled it already?
I recently changed my oil, removed about 110mL ( with the s/c removed from the car) and put back around 130mL. From my experience, I believe filling it to the plug would be too much oil.
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Old Jul 8, 2019 | 10:25 AM
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Yes it can be overfilled if u have too much oil in it.can come out the frt bolt area. How do i know brand new upper pulley from upd less than a 1000 miles so bearing is perfect. Just changed the supercharger oil and overfilled n had same problem. Did some research an found the same prob so drained fluid and refilled with exactly 150ml an zero probs since.
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Old Jul 8, 2019 | 10:54 AM
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Well thanks for all the replies I have about 10000 miles since I changed the supercharger oil. I have ruled it to be I overheated the supercharger from sitting in the staging lanes for 20 minutes then forgetting to turn my intercooler on. So the fluid expanded more then normal. It wasn’t a crazy amount just a few drops.
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Old Jul 9, 2019 | 11:31 PM
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Originally Posted by bbirdwell
You can't overfill the oil. It's a fill hole in the supercharger. You have to inject oil into the hole and if it is too much oil it will just come back out the same hole, just like the differential. The more oil you put in, the more oil that comes out.
You can, it happens
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Old Jul 10, 2019 | 12:17 AM
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Originally Posted by knowbenz
You can, it happens
Truth as i had same prob an after removing excess the problem went away
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Old Jul 10, 2019 | 09:53 AM
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Make sure to use teflon or thread sealer on all the screws that SC oil can leach out of, as they can leak and throw oil out. Proper level is important and the dealer will say the oil is non service item but most all the supercharges on the 55 get low on oil. Low oil and bye bye bearings and that can equate to a destroyed motor.
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Old Jul 10, 2019 | 05:53 PM
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Originally Posted by E42AMG???
Well thanks for all the replies I have about 10000 miles since I changed the supercharger oil. I have ruled it to be I overheated the supercharger from sitting in the staging lanes for 20 minutes then forgetting to turn my intercooler on. So the fluid expanded more then normal. It wasn’t a crazy amount just a few drops.
I didn’t think the intercooler had any impact on temperature of the supercharger or the oil inside it, just the intake air.
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Old Jul 10, 2019 | 06:51 PM
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Originally Posted by N_Rob
I didn’t think the intercooler had any impact on temperature of the supercharger or the oil inside it, just the intake air.
The core is mounted to it, it’s not going to make it the same temperature as the core but help keep the unit below engine temp.
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Old Jul 10, 2019 | 07:07 PM
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Originally Posted by E42AMG???
The core is mounted to it, it’s not going to make it the same temperature as the core but help keep the unit below engine temp.
Gotcha thanks
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