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 Write-Up: Supercharger Coupler Replacement (Series II)

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th3fr4nchi5e
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Thu Sep 26, 2013 9:00 pm

No gastket, just a thin bead of RTV or whatever came with your coupler.
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri Sep 27, 2013 5:37 pm

This site is awesome! Riv Owners RULE!

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highwaywarrior
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri Sep 27, 2013 9:09 pm

Ok, replaced snout with sealant, put it back together and still leaking, what do I use to clean off the sealant and reapply? Im thinking I either didmt tighten it correctly or I puttoo much sealso it didnt close all the way? Also I failed to mention that when I pulled the snout off, partof the upper intake gasket came off with it...isnt that the part that some of you cut off?

When you say thin, how thin is a thin layer
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri Sep 27, 2013 10:23 pm

By thin I mean about the diameter it flows out of the squeeze tube. As long as it you get all the way around without any gaps, it shouldnt leak? When we did mine, the gasket maker was only a few mm. Its weird that you're still getting a leak after removing it and putting new gasket maker in. Did you let the gasket dry good before filling with oil? And does the surface you apply the RTV stuff to look corroded where it would not sit flush?
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri Sep 27, 2013 10:33 pm

There must be some damage or debris on the mating surfaces. I used NO sealant when I assembled mine, and it doesn't leak a drop.

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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri Sep 27, 2013 11:20 pm

I will take it apart again, recommendations for cleaning debris, sealent off? Im willihg to bet I didnt let it dry. Now, let it dry before I put it back together, or put it together and then let it sit?
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Sat Sep 28, 2013 12:05 am

I always use a razor blade to clean off all of the debris. And I meant put it together and let it dry, before adding the oil again! Like AA said though, if the surface is clean and nit damaged or worn in any way, it should be flush enough that the gasket is only insurance.
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Sat Sep 28, 2013 12:13 am

Alright cool, so remove it, clean off with razor, reseal, let dry first before adding oil, how long did you let it sit?
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Sat Sep 28, 2013 2:23 am

Most people say it takes a few hours to cure and around 24hrs to dry. If you wait 2-3 hours that should be fine but if you not dependent on the car to go somewhere right away might as well let it set a bit longer!
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Sat Sep 28, 2013 10:26 am

Alright thats what I will do then. Thanks
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Tue Oct 01, 2013 11:21 am

Son of a b.... took the snout off again for the second time, resealed it, its still leaking, what sequence was use dto tighten the bolts down? ! Im about to give up
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Tue Oct 01, 2013 11:28 am

i think i have my old snout around here somewhere. needs cleaned and the old drain plug taken out (stripped head) and of course a new one put back ( 8 bucks gm dealer). if ya want it its yours just pay shippin. let me know and ill look for it
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Tue Oct 01, 2013 12:06 pm

I feel like you either messed the snout up, or you're not using enough sealant. Maybe post some pictures of the bare metal and how much sealant you're using? Is the belt lining up right and not squealing?
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Tue Oct 01, 2013 3:58 pm

Belt is lined up correctly, no squealing . seems to be coming out of the bottom. How did you guys tightened the bolts? Top to bottome, left to right etc. As far as the sealant goes. When I put the bead around the snout, am I supposed to spread it out into a thin layer or no?
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Tue Oct 01, 2013 4:58 pm

I know this is a little extra work, but by removing the entire supercharger you can have better visibility as to where the leak is coming from. The blower should hold SC oil off the car. It will also permit you to replace the SC gasket with a fresh one.

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180Ί t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
Because cool


'95 Celica • 152k miles • 0-60: yes
Because free
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Karma
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Tue Oct 01, 2013 5:04 pm

highwaywarrior wrote:
Belt is lined up correctly, no squealing . seems to be coming out of the bottom. How did you guys tightened the bolts? Top to bottome, left to right etc. As far as the sealant goes. When I put the bead around the snout, am I supposed to spread it out into a thin layer or no?
tightening order doesn't really matter. RTV should be very very thin, but some guys don't even use it. The surfaces are machined and should seal just by tightening. The surfaces aren't gouged are they? Or perhaps its your snout seal thats leaking?

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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Tue Oct 01, 2013 9:00 pm

Hm, i dont mind taking her apart again. I didnt look damaged or anything when i cleaned it off again, the second time. Also when i took it off. The red sealant wasnt even on the machined surface it spread to the outer parts. So here what i will do, take the sc off and see where its leaking. Take the snout off and use a different sealant RTV high temp?

Snout seal looks good lol
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Thu May 17, 2018 5:43 pm

I've developed a choo-choo train sound which seems to be coming from the SC snout -



What do you think?

Incidentally, the chirruping you could hear in my new alternator @1:00 here appears to have gone away -

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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Mon May 21, 2018 10:59 pm

For future ref Abaddon says the SC coupling makes a rod knock sound at idle (only at idle), so that rules one possibility out.
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri May 25, 2018 3:24 am



I ran the engine with the SC belt off, the choo choo sound is definitely coming from the SC.  I checked the SC oil level, that's fine.  I can't feel any play in the coupler, but I can hear some little impact sound back at the base of the snout when I switch directions rocking the pulley back and forth.  If there is an play it has to be tiny, like a 1/32 or 1/64.  Turning the pulley doesn't feel buttery smooth, but there's nothing that jumps out and says "this is a bad bearing."  I guess it could be, but from what I've been reading so far the bearing is not likely to fail.  I'll keep an eye on this and see what happens, unless someone spots a/the problem.
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri May 25, 2018 8:35 am

That doesn't sound right to me. When you spin it, it should be relatively noise free. Yours is making a "zipper" type sound. Unless it's the video making some weird feedback.

Correct on the coupler noise. The coupler has 6 holes, with 3 on each side. They're offset of each other. The snout gear has 3 pins, and the rotor gear has 3 pins. The coupler is what mates the whole unit together. Over time, the (not metal) coupler wears out, and the holes oblong.
The 3800 naturally misfires at idle. Those misfires, cause a momentary "stoppage" of the S/C, which causes the pins to slam against the coupler. The sound gets worse as the engine warms up. If you ever hear a knock from the upper engine area, put a stethoscope (or screwdriver) on the S/C and to your ear......
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Fri May 25, 2018 10:05 am

Abaddon wrote:
That doesn't sound right to me. When you spin it, it should be relatively noise free. Yours is making a "zipper" type sound. Unless it's the video making some weird feedback.

Correct on the coupler noise. The coupler has 6 holes, with 3 on each side. They're offset of each other. The snout gear has 3 pins, and the rotor gear has 3 pins. The coupler is what mates the whole unit together. Over time, the (not metal) coupler wears out, and the holes oblong.
The 3800 naturally misfires at idle. Those misfires, cause a momentary "stoppage" of the S/C, which causes the pins to slam against the coupler. The sound gets worse as the engine warms up. If you ever hear a knock from the upper engine area, put a stethoscope (or screwdriver) on the S/C and to your ear......

The coupler noise is one of a few, only a few sounds from an SC 3800 that makes one think sudden death is imminent.

One of the others is the alternator bearing. Ever heard one of those failing? Sheesh, I thought I'd spun a bearing.

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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Sat May 26, 2018 1:19 am

Abaddon wrote:
That doesn't sound right to me. When you spin it, it should be relatively noise free. Yours is making a "zipper" type sound. Unless it's the video making some weird feedback.

The "zipper" sound is accurate, not an artifact. It sounds like it's coming from the pulley area, so maybe a bad bearing after all, unlikely though it may be?
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Sun May 27, 2018 3:37 am

Looking at ZZP vs Intense snouts, the Intense rebuild is radically cheaper?

ZZP

Intense

I don't understand why there's such a price difference, but the Intense rebuild isn't so bad, if that's what I need.
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PostSubject: Re: Write-Up: Supercharger Coupler Replacement (Series II)   Sun Jun 10, 2018 2:51 pm



SC snout is off, sounds like the bearing is bad?

Here's a couple pics of the bolt holes -





With the front bottom bolt out (easily missed), I was able to pry the snout off using a crowbar against the accessory tensioner to break the snout loose. The snout was glued on pretty good, but nothing the crowbar couldn't handle.

I looked at the coupler and I bet it's already been changed, I can find no play in it at all. Unless it can't take extra boost, I see no reason to change it.
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