Measuring Supercharger clutch gap
Super Member
Joined: Dec 2011
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From: EDH, CA.
2012 E63 AMG
There will be some variance when the pulley is spun. Better tight than loose IMO. If the gap is too great, the clutch pulley springs will work harder and are more likely to wear more (and break) over time. Get a LM21 scattershield for safety.
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From: Indianapolis
2004 E55.98 SS Camaro.Jetta TDI. Expedition
Also make sure your using Mm and not inches. And yes as you spin the pulley the gap will vary. Keep the largest under .5 mm and you will be fine.
Last edited by Ls1toAMG; Sep 28, 2016 at 08:12 AM.
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2016 E63s Wagon - CCB & CF package
You may close but ok. I just installed my pulley and I can fit the 0.35 and 0.45 gauges in but not the 0.50. 0.45 is tight, 0.35 goes in ok.
You can also start the car and try to lightly apply pressure to the magnetic clutch. If you can easily stop it while the pulley is turning, i'd say you are OK.
Or with the car OFF, turn the magnetic clutch and listen closely whether its scrapping against the pulley.
Do these "tests" at your own risk! Gloves are a good idea. Clutch gets hot and trying to stop it can burn. I usually use a microfiber and just apply pressure with 2 fingers and it stops.
You can also start the car and try to lightly apply pressure to the magnetic clutch. If you can easily stop it while the pulley is turning, i'd say you are OK.
Or with the car OFF, turn the magnetic clutch and listen closely whether its scrapping against the pulley.
Do these "tests" at your own risk! Gloves are a good idea. Clutch gets hot and trying to stop it can burn. I usually use a microfiber and just apply pressure with 2 fingers and it stops.
Last edited by V-AMG; Sep 28, 2016 at 12:34 PM.
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e55
Redirecting an old thread I know, but I can't locate specific reference as to how far the feeler gauge has to go into the gap to get the reading. Is it just at the very "outside" of the gap e.g feeler gauge goes in 1 to 2mm, or is it 30-40mm?
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w220 S55 AMG 2004
it shouldn't matter .. the gap should be equal since the supercharger pulley is parallel to the magnetic clutch so measure it from any place ... if your gap is not equal ( which i doubt) then you have a much bigger problem...
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e55
Thanks, after seeing it once I took the pulley off you're bang on. I took the plunge and pulled the pulley as the gap was around .55. Only 2 shims left, removed one, 50/50 likely I'll need another removed. Bearing good.
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w220 S55 AMG 2004
since you are removing ( NOT ADDING) i will go ahead an assume that you are talking about the stock supercharger pulley.
keep in mind that once you upgrade your supercharger pulley , you will most likely need to add more shims when the pulley gets older. so keep those shims in a safe place.
keep in mind that once you upgrade your supercharger pulley , you will most likely need to add more shims when the pulley gets older. so keep those shims in a safe place.
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Joined: Jun 2018
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e55
since you are removing ( NOT ADDING) i will go ahead an assume that you are talking about the stock supercharger pulley.
keep in mind that once you upgrade your supercharger pulley , you will most likely need to add more shims when the pulley gets older. so keep those shims in a safe place.
keep in mind that once you upgrade your supercharger pulley , you will most likely need to add more shims when the pulley gets older. so keep those shims in a safe place.
Yep stock pulley, 221k kilometres travelled. Ive kept the shim I removed, I can only assume there were 3 to begin with.
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w220 S55 AMG 2004
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e55
Seems like the sc is engaging better, still a slight chirp but from what I've learnt it's not going to go away completely especially on a car this long in the tooth. What is concerning is it doesn't seem to be that quick. FWIW I've a 2003 Audi c5 rs6 @ 204k km (stock) and a 2006 Audi D3 S8 (stock) @ 140k km. Both feel much healthier, but both are lower on the torque side of things (on paper).
No errors on the dash, no smoke, wonky idle etc. I'll try to time the 0-100kmh but it just feels slow.
No errors on the dash, no smoke, wonky idle etc. I'll try to time the 0-100kmh but it just feels slow.
