Violent Engine Shake

[Hugo Stiglitz]

Hey All,

Trying to find the source of this issue. See the video below. Under power, I am getting a pretty violent shaking from the engine and trans. Since the video was taken I've dropped the engine and trans out of the car. Everything seems to checkout with the engine: flywheel isn't loose, clutch and pressure plate seem in order, and the gland nut is in tact.

The trans was recently run through and upgraded with HD axles (I snapped an axle a few weeks back). I put it back in the car, and not 500 miles later I'm getting this violent shaking. So logic seems to be leading to the trans being the issue... However, I currently have it at the shop who did the work, they've got the axles and diff pulled apart and they're saying they don't see anything wrong... (yet - he's gonna keep digging)

That feedback left me a little puzzled, so I figured I'd post up here. Any thoughts on what might be causing the shaking?


Link

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[mukluk]

How are the transaxle mounts?
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1960 Ragtop w/Semaphores "Inga"

[Hugo Stiglitz]

[mukluk]

Clutch/pressure plate slipping or shuddering maybe?

Does this happen in a specific gear? Maybe you have a gear slipping on its shaft.

A long shot and not likely, but how are the splines in the rear drums?
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1960 Ragtop w/Semaphores "Inga"

[Hugo Stiglitz]

[FreeBug]

if the engine is solidly bolted to the transmission, that means the whole engine/trans is jumping around as a unit.

Are the frame horns and chassis OK? And the rubber bushings which hold the spring plates?

[74 Thing]

How are the spring plate bushings and do you have anything like a traction bar, kafer bar, or mid mount for the tranny. How are the frame horns?

[Hugo Stiglitz]

[mcmscott]

No midmount or traction bar, and you broke an axle,,, huge red flag!! Why the need for hd axles and who installed them?
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[mark tucker]

my vote is dropping cylinder.

[qdelarosa]

I agree with Mark, you may not have a cylinder firing properly. Maybe check to see that your spark plugs are good?
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[runamoc]

if the dual carbs are so out of 'sync' the engine will shake at certain RPMs.
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[Hugo Stiglitz]

[FreeBug]

[richierich]

[Zed999]

[mcmscott]

[jonny1309]

I had a similar shake last summer while driving to Prado from OCTO. It was fine at idle and lower rpms. I got it to prado by going easy on the throttle thinking I'd try to figure it out over the next 24 hours.

20 hours later, I started by looking at the plugs (I re-jetted the day before since my bus just came from altitude). I pull the #2 wire and find a cracked isolator right at the plug. I got a new set of wires from the swap and I was off and running.

Take a look at your plug wires.
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Jonny

[auslander]

I had a similar problem when the thrust on the bearing was wrong. Ran great, never had a problem. Tore it down and put all new bearings in.
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I’d be taking a closer look at the diff components. Every broken swing axle I’ve come across has broken the perimeter ring on the side gear as well.