flywheel/clutch vibrations ? please help
09-04-02, 03:09 PM
#1
flywheel/clutch vibrations ? please help
I installed lightened steel flywheel from RPM Performance, australia toghether with counterweight (used series 4 auto ?) and new clutch and damn thing is vibrating like **** in higher rpm's....
i used 6 new bolts same lenght for bolting flywheel onto counterweight and new long bolts for clutch, 6 bolts same size
all pictures could be seen on
http://rx7cz.net/photos/stuff1/page_02.htm
http://rx7cz.net/photos/works14/
what could be problem and how to solve it ? bolts ?
Exept vibrations (which u could feel really easy either revving car in neutral or drivin) its running good, clutch is really cool....
i used 6 new bolts same lenght for bolting flywheel onto counterweight and new long bolts for clutch, 6 bolts same size
all pictures could be seen on
http://rx7cz.net/photos/stuff1/page_02.htm
http://rx7cz.net/photos/works14/
what could be problem and how to solve it ? bolts ?
Exept vibrations (which u could feel really easy either revving car in neutral or drivin) its running good, clutch is really cool....
09-04-02, 04:22 PM
#2
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Could be one of several things
Either you put in the wrong counter weight (unlikely if you bought the set up from someone that knows what they're doing assuming you have a S4), or you have a bad Tranny mount (cross member brace with rubber bushing in center.
Other possibilites, but most likely one of these two.
Other possibilites, but most likely one of these two.
09-04-02, 07:32 PM
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Does it do it if you rev the engine while the clutch is disengaged ( pedal on the floor )?
If so, that narrows it down to something solely engine related...Probably something you just did wrong with the flywheel.
If it DOESNT do it with the clutch disengaged, then its a problem with the tranmission.
If so, that narrows it down to something solely engine related...Probably something you just did wrong with the flywheel.
If it DOESNT do it with the clutch disengaged, then its a problem with the tranmission.
09-04-02, 07:39 PM
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Good diagnosis observation
If the shaking/vibration happens while reving the engine while it is out of gear, then that (unfortunatley) lends focus to an incorrect counterweight.
The Tranny mount question, the center of the cross member has a rubber bushing where a center bolt goes. The center part of this bushing is connected to the barrel part via (as I recall) three fingers. These fingers break, removing any support the bushing would otherwise give. Only solution is to replace the whole thing.
It would be good to confirm your counterweight indeed came out of a S4.
The Tranny mount question, the center of the cross member has a rubber bushing where a center bolt goes. The center part of this bushing is connected to the barrel part via (as I recall) three fingers. These fingers break, removing any support the bushing would otherwise give. Only solution is to replace the whole thing.
It would be good to confirm your counterweight indeed came out of a S4.
09-04-02, 09:20 PM
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hehe
I came up with all those observations while trying to diagnose a vibration on my buddies Miata. ( I dont normally sit around thinking about stuff like that )
Turns out it was, oddly enough, his timing belt.
I came up with all those observations while trying to diagnose a vibration on my buddies Miata. ( I dont normally sit around thinking about stuff like that )
Turns out it was, oddly enough, his timing belt.
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09-09-02, 10:21 AM
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I get vibrations also when my car is in netrual. From 1k to 3k i can feel something spinning on my steering wheel and on the shifter. I haven't replaced anything yet, so i can't figure out what it is. Maybe it is the transmission mount.
09-09-02, 10:44 AM
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I've heard all light flywheels use the automatic tranny counterweight, but I could be wrong.
I would say its the counterweight from what it sounds like. Or possibly the tranny input shaft slightly warped? Thats the only other thing that would be in contact with the engine when the clutch pedal is pressed.
I just recently fixed a problem with my lightened flywheel and clutch that I installed back in May.
Turns out the flywheel nut was backing off and letting the flywheel rattle back and forth on the axis from the front of the car to the back
Anyways, good luck with it!
Geoff
I would say its the counterweight from what it sounds like. Or possibly the tranny input shaft slightly warped? Thats the only other thing that would be in contact with the engine when the clutch pedal is pressed.
I just recently fixed a problem with my lightened flywheel and clutch that I installed back in May.
Turns out the flywheel nut was backing off and letting the flywheel rattle back and forth on the axis from the front of the car to the back
Anyways, good luck with it!
Geoff
09-09-02, 10:50 AM
#13
Well, i will probably take out tranny, check all bolts on clutch, then on flywheel/counterweight and if nothing will looks loose, i`ll put on old flywheel and old clutch to see if that was problem.....it doesn`t look like tranny mount to me, i already checked it and seems to be ok
09-09-02, 01:06 PM
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Mine wasnt vibrating really. It was knocking from the flywheel being loose.
It was driveable, but it was getting to the point where I was worried about what was wrong and didnt want to damage almost a grand in clutch and flywheel parts.
What I mean by getting to a point is, it would knock pretty bad at idle and part throttle in gear. And what really got me was it would rattle at a high rate like a buzzing almost, and sometimes it would hang causing the engine to buck.
Things *hanging* in the drivetrain is obviously bad so I pulled it, found it was the nut backing off, tightened it, and I just need to get my new exhaust shortened a bit and she'll be running again
It was driveable, but it was getting to the point where I was worried about what was wrong and didnt want to damage almost a grand in clutch and flywheel parts.
What I mean by getting to a point is, it would knock pretty bad at idle and part throttle in gear. And what really got me was it would rattle at a high rate like a buzzing almost, and sometimes it would hang causing the engine to buck.
Things *hanging* in the drivetrain is obviously bad so I pulled it, found it was the nut backing off, tightened it, and I just need to get my new exhaust shortened a bit and she'll be running again
09-09-02, 01:59 PM
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Neither did I. I realized after I took the tranny out and it did move was, the tranny input shaft was holding it in place.
Sadly you seem to be at the point where you have to take it apart to find out whats wrong
Sadly you seem to be at the point where you have to take it apart to find out whats wrong
09-10-02, 12:22 PM
#19
got idea it might be leaking exhaust manifold or something like that, so before taking out tranny, i`ll wait for my hybrid, exhaust manifold and downpipe
its drivable, but i don`t have money for gas anyways so i`ll give it break another month or so....
its drivable, but i don`t have money for gas anyways so i`ll give it break another month or so....
09-18-02, 09:33 AM
#20
I digged out engine today, i have problem with water leaking into intake (might that be reason for vibrations ?) I`m sure thats the reason for my poor idle, but don`t know about vibrating...
Nothing was loose on clutch/flywheel, i`ll take it for balancing to see if there is anything wrong.
Could using 6 mm longer bolts than stock ones for clutch cause vibrations ? All bolts i`m using are same lenght...
Before fixing water leak in lower intake manifold and swapping anything, i`ll try it with stock flywheel and clutch to see if its vibrating or not...i just hate that install and removal procedure ... its taking too much time...but on other side its good drill to remove and install back your engine couple times/week ;o))
Nothing was loose on clutch/flywheel, i`ll take it for balancing to see if there is anything wrong.
Could using 6 mm longer bolts than stock ones for clutch cause vibrations ? All bolts i`m using are same lenght...
Before fixing water leak in lower intake manifold and swapping anything, i`ll try it with stock flywheel and clutch to see if its vibrating or not...i just hate that install and removal procedure ... its taking too much time...but on other side its good drill to remove and install back your engine couple times/week ;o))
09-18-02, 10:44 AM
#21
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i hope everything works out becuase i just ordered the same thing today 
make sure you pm me and let me know if it was a clutch problem or just another engine problem thanks
make sure you pm me and let me know if it was a clutch problem or just another engine problem thanks