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By Woody - 11 Years Ago
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I have a really bad shudder in my drivetrain. It comes on mid rev range and gets progressively worse through the rev range. It happens when I’m driving and also when the cars stationary and I rev with the clutch pedalto the floor which makes me think it’s not a clutch related issue but I am not 100% sure if having the clutch disengaged would eliminate a clutch problem, like it not aligned properly or maybe its a flywheel issue. Prior to me inheriting the car from my father-in-law he had a new clutch plate installed but he never got to drive the car after the work was done. I don’t think the shudder was there before. He gave me a long list of things that needed doing to the car before he passed away and the shudder was not on the list, so I assume it wasn’t there before the work was done. I have done some trouble shooting, having a new harmonic balancer fitted (I was sure this was the problem) but the shudder is still there. I have also removed the fan belt and it’s not a fan issue.
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By MoonShadow - 11 Years Ago
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Run a check on the plugs wires for proper order, remember the distributor on a Y is counter clockwise. If the wires are all correct pull the plugs and check each to see if its been firing correctly. Chuck
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By miker - 11 Years Ago
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When you say shutter, I think clutch engagement, so I'm going to assume you mean an engine vibration. Best of my knowledge, all Y's are internally balanced. Or the flywheel only goes on one way. If I'm wrong, someone will set me straight. Even when our dampeners slip, it's the timing mark affected, not a vibration. Does it vibrate in neutral with the clutch out? Is clutch engagement smooth when starting out and shifting? Who did the clutch, some reliable mechanic, or someone who left a bolt off, or removed the pilot bushing?
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By Woody - 11 Years Ago
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Yes still shudders in neutral. Clutch engagement is smooth when shifting. I figured its a clutch/driveline problem but it could also be engine related. The whole car shakes so its hard to isolate the problem. Leads and plugs were changed at service so I will check leads are connected in the correct order. Would be a relief it that's all it is.
Cheers Woody
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By MoonShadow - 11 Years Ago
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You say it vibrates whether its in gear or not and running at idle or reving in neutral then its most likely not a drivetrain problem but and engine problem. If you just had plugs and wires done that is where I would start. It's easy to miss the firing order especially if the mechanic isn't used to Y-Blocks. They have a different firing order and reverse direction. Chuck
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By Woody - 11 Years Ago
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I checked the leads and they are in the correct firing order 15486372 going counter clockwise. Spark plugs and leads are new. Maybe its a loose timing chain? Not sure how that would effect balance at higher revs?
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By Ted - 11 Years Ago
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Assuming you've run a compression check and all the cylinders check out okay, I’m thinking a pressure plate that is either ‘out of balance’ or not centered properly on the flywheel. Using non-shouldered pressure plate bolts can add to ‘centering’ issues. Another possibility is a flywheel that has been resurfaced without the balance being rechecked.
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By CK - 11 Years Ago
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Have you checked your side engine mounts.On my Tbird the chassis bracket cracked and worked the rivets loose on the right hand side, which is now welded. I did have a vibration before restoration, yet i think it was more likely the clutch. However it did push the gearbox bush in away from bearing the drive shaft yoke, which may have had something to do with it. May have been a combination. Though as for the mounts, the engine can move quite alot if these are loose and it may not be the cause yet it is worth eliminating the possibility.
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By Woody - 11 Years Ago
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The vibration is present when the clutch is in and also when revving with no gear engaged (in a neutral position) so could I eliminate pressure plate and flywheel possibilities or would these parts still shudder regardless?
Will check compression and engine mounts. Thank you for your ideas.
Cheers, Woody
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By Ted - 11 Years Ago
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Woody (7/3/2014)
The vibration is present when the clutch is in and also when revving with no gear engaged (in a neutral position) so could I eliminate pressure plate and flywheel possibilities or would these parts still shudder regardless? ...Pushing the clutch pedal in and revving the engine takes the clutch disk out of the equation but the flywheel and pressure plate are still players regarding the vibration you are experiencing.
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By DryLakesRacer - 11 Years Ago
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Discs are rarely a problem but I have never found a true pressure plate. When balancing, a shop will check the flywheel first with out a pressure plate and balance it as needed then attach the plate and check it again welding weights on it or drilling dimples to remove weight. They will then make peen marks or paint to direct the exact way to put it on.
If the flywheel was resufaced when doing the clutch replacement and rebalancing was not done, I would go there. One other thing check the attaching cap srews on the pressure plate. All 6 should be EXACTLY the same. Proper ones have a small shoulder before the threads for alignment and room for split lock washers. I would not use the star type..Good Luck
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By Y block Billy - 11 Years Ago
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If the car has been sitting a while, mice tend to love to make nest in the pressure plate area and that could throw things out of balance. Have you dropped the inspection cover on the trans and and made sure things are clean in there. also those new chinese pressure plates are not balanced very good if any at all. I had a brand new one checked for balange and it was out by about 1/2" long piece of 5/16" bolt we welded on to get it balanced.
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By ejstith - 11 Years Ago
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I had a buzz in mine from about 55 mph up. I had my driveshaft balanced & that got rid of it for the most part...
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