Vibration - Team Camaro Tech
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post #1 of 6 (permalink) Old Mar 2nd, 03, 12:20 PM Thread Starter
 
Join Date: Dec 2002
Location: DeFuniak Springs,Florida,USA
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I have a 1979 camaro,350,4 speed trans, And i have a vibration at 2000rpm and ending at 3000rpm,
now setting still reaving the motor with the clutch engaged i still have the vibration, when i depress the clutch and rev the motor, the vibration is virtually gone...
Any Ideas ? ....... Thanks For Any help, Jimwashere [img]graemlins/clonk.gif[/img]
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post #2 of 6 (permalink) Old Mar 2nd, 03, 09:35 PM
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Could be the clutch being engaged is helping dampen the vibration. You'll have to look at your flywheel for sure. It's the thing with a big saw blade all the way around it's edge right next to your legs. I mean gear teeth for the starter to engage. Just a little motivation to get you to check it.
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post #3 of 6 (permalink) Old Mar 3rd, 03, 03:13 PM
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The only thing not turning at the 2000 to 3000 rpm with the clutch pedal to the floor would be the transmission guts and friction disc, My money says it is the friction disc,
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post #4 of 6 (permalink) Old Mar 3rd, 03, 03:45 PM
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Vibration is a tricky thing to troubleshoot. Subtle vibrations can be a combination of multiple things acting together. Seems we can rule out drive shaft or pinion angle problems for the moment. Engine vibration seems minimal with the clutch engaged. Although it's possible that the added inertia when the clutch is engaged causes and engine resonance to come through. The more likely causes are clutch or input shaft related. Consider pulling the transmission and checking run-out on the input shaft with a dial guage. Also check the pilot bushing in the end of the crank. Clutch pressure assembly is probably all-right. Does the clutch assembly have a few thousand miles on it? If the tranny input shaft is Ok, perhaps it's time to resurface the flywheel and put in a new clutch. You'll have to crawl under and start unbolting stuff to find out.

-dnult
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post #5 of 6 (permalink) Old Mar 4th, 03, 01:53 AM Thread Starter
 
Join Date: Dec 2002
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Thank's for all the advice, I will be replacing the clutch,pressuer plate,throw out bearing.pilot shaft bearing, and resurfacing the flywheel this weekend.
Thanks Again, Jimwashere [img]graemlins/hurray.gif[/img]
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post #6 of 6 (permalink) Old Mar 4th, 03, 05:25 AM
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Agree with info posted here by others.

If you are going to change everything, I'd go ahead and resurface the flywheel, then take everything down to the local machine balancer and have them to balance to less than 1/2 gram @2500 rpm.

This will further eliminate these items. I believe it would be alittle hard to measure the input shaft runout with the shaft still attached to the trans. If one were to remove it from the trans and take to the machine shop and have them do a runout with a live center, then, this would be a good idea.

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