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.

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

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

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?

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

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

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

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

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?

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.

Lorena, Texas (South of Waco)

Have you checked your side engine mounts.

Will check compression and engine mounts. Thank you for your ideas.Cheers, Woody

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.

Lorena, Texas (South of Waco)