We have a 93 Park Avenue Ultra with a rattle that seems to be coming from the s/c pulley or the tensioner next to it.
I removed the belt from both and the noise disappeared. The s/c pulley seems to turn easily enough by hand.
The rattle goes away at 1000 RPM. How can I determine what is causing the noise?
Rattle me this, Batman......
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J Wikoff
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Re: Rattle me this, Batman......
Put on one belt at a time and see how that effects the rattle. Is there any slop (rotational or side/side or up/down) in the SC pulley?
WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
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mrvids
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S/C 3800 - Location: Michigan
Re: Rattle me this, Batman......
The s/c has new bearings and a rebuild about 8K ago, with no slop that I can notice. I can't really remove the belt from one or the other as it's too long to do that. I may take my drill and a lawn mower belt and spin them one at a time to see if either makes the noise.
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01bonneSC
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1997 'maro (3.8L M5)
89 SkiDoo - Location: Sycamore, IL
Re: Rattle me this, Batman......
A long screwdriver or mechanics stethescope would help you out a lot.
00Beast wrote:Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.
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J Wikoff
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Re: Rattle me this, Batman......
I meant put on the SC belt by itself, then the other by itself to see if it isolated the noise to one set of pullies. If it's present with both, you'd probably narrow it down to the harmonic balancer. The rubber in them can crack over time and it'll rattle like sunovagun, and be difficult to tell just by listening.
WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights
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mrvids
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- Year and Trim: 1993 Park Avenue Ultra
S/C 3800 - Location: Michigan
Re: Rattle me this, Batman......
The noise is only made when both belts are on. If I remove the belt that runs the s/c it goes away.
When I put the screwdriver to it I can't tell if the sound is coming from the s/c or the tensioner.
I am leaning torward the tensioner because it shakes more than the s/c pulley, but then again, it's supposed to absorb vibration, right?
When I put the screwdriver to it I can't tell if the sound is coming from the s/c or the tensioner.
I am leaning torward the tensioner because it shakes more than the s/c pulley, but then again, it's supposed to absorb vibration, right?
Last edited by mrvids on Mon Sep 03, 2012 3:56 pm, edited 1 time in total.
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01bonneSC
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1997 'maro (3.8L M5)
89 SkiDoo - Location: Sycamore, IL
Re: Rattle me this, Batman......
A tensioner should not vibrate up and down at idle. If it dances, replace it.
00Beast wrote:Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.
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mrvids
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S/C 3800 - Location: Michigan
Re: Rattle me this, Batman......
Replaced tensioner, noise still is there. Fluid on s/c is up to the threads, although it is dark. The s/c pulley feels smooth and I can hear the air moving when I spin the pulley.
Last edited by mrvids on Tue Sep 04, 2012 12:49 pm, edited 1 time in total.
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MattStrike
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Re: Rattle me this, Batman......
Sound like it could be the coupler in the supercharger, hand rotate the pulley back and forth rapidly and see if it starts to make the noise?
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The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'99 Montana - top swap 3800
'04 Sierra 2500HD - LLY Duramax
Current project:
Something cool, trust me.
Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre
Gone to greener pastures:
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap
RIP:
'86 LeSabre - pictures
'93 SE - L67
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mrvids
- SLE Member
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- Year and Trim: 1993 Park Avenue Ultra
S/C 3800 - Location: Michigan
Re: Rattle me this, Batman......
Winner! The harmonic balancer is being replaced as I write this, I didn't think $300 for labor & parts was too bad.J Wikoff wrote:I meant put on the SC belt by itself, then the other by itself to see if it isolated the noise to one set of pullies. If it's present with both, you'd probably narrow it down to the harmonic balancer. The rubber in them can crack over time and it'll rattle like sunovagun, and be difficult to tell just by listening.
The garage owner called it when I pulled in to his driveway, he asked if the harmonic balancer made that rattle all the time, I said no, only under 1000 RPMs.
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maroon111993
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Re: Rattle me this, Batman......
Hm. Mine did this when I first got it. Changed S/C oil and good to go! But good to know that it could be the harmonic balancer if it ever happens again!
1997 Grand Prix GTP "Black Ice, 'cuz it's slick" - 17" Motegi Racing Rims, Hankook Optimo Performance Tires, 'Big 3' Wiring Upgrade, Weapon R Secret Weapon Intake w/ Ram Air, Larger SuperCharger lines, AutoLite 104's, U-Bend Delete, Resonator Delete, Cat Delete, Turbo Flowmaster Mufflers. 342bhp, 327 lb-ft torque, 9.091 boost psi @ 6,012 rpm.