455 pulley wobbles. i removed the pulley to check for damage and cracks but it checks out OK. I put my braker bar on the crank bolt, it's tight. i check the end play, with out an indicator about .010", it has not changed its always been appx .010". At 850RMP it wobbles, if i raise the rpm's it runs true and as the rpms come down it starts wobbling again. I tried but could not upload a video here. Cheers!
I have the same issue. I took off the flex plate cover and also noticed my flex plate seemed to have more wobble than what I thought to be normal yet the converter spins true. I'll be watching this post for some insight to the situation.
WHICH pulley? The one on the crankshaft damper? I don't know how it can wobble at 850 rpm but not at higher speed.
Does it have a vibration associated with the wobble? I've seen belts with a nick in them that gave an optical illusion of a wobble? Just a thought!
if it wobbles at 850 it wobbles at rpm too. if someone used a hammer to drive the dampener on instead of pulling it on with a tool the could have damaged the face where the pulley sits..........pulley could be bent, or cracking.........lost a crank pulley the other season racing........the center hub was still bolted firmly in place, the rest of it.......gone somewhere on the grounds of clay city ky dragstrip. I sure hope someone found it b4 the mower did.......lost it about near the 660 mark, made a hell of noise and caved in the tube for #2 alot....... flex plate wobble is actually fairly normal and long as not crazy. my brand new jaw wheel had .030 when installed. rear crank flanges has 0. jw wheel told me perfectly within specs. go ahead and run it. course they also sent me the same late with the balance weight covering one of the holes needed for my torque converter forcing me to redrill 3 new hole, after everything was balanced
My pulley was bent, i put it on a flat surface and tapped it with a hammer while pedestal mic it each time and got it straight. Must have bumped it removing engine at one time.
Hi Larry! i check the end play, with out an indicator about .010", it has not changed its always been appx .010". Has a balloon plate on the convertor. I think i'll remove the pulley and check it with just damper.
Hey Skylard I wasn't trying to hijack your post by the way I just wanted to post the videos so you could see if it was doing the same as mine. I'm watching your thread in Hope's of gaining new insight. Cheers!
If a pulley is bent, it doesn't miraculously straighten out at higher RPM, so there is another reason for the movement. The only thing I can think of that fits the observed movement is crank end play. Specs say .003-.009, but you need to be precise when measuring it. A dial indicator is best I guess.
1969 Rivi..... it’s good to see another video. I was reading on yellow bullet Chevy guys with same problem. I’m guessing someone who runs an engine dyno, could shed some lite. Larry, I know what you mean but even if the converter ballooned and was .060” forward I don’t see how that would cause this. I don’t hear a crank bearing making noise. I did take the belts off and yanked up n down on the pulley, I didn’t feel any movement. If it wasn’t raining I’d remove the pulley and watch the damper. Thanks guys Cheers!
As the others have posted, ..... the pulley is not straightening out with higher engine RPM, it is just more difficult for the eyes to pick up the wobble at higher RPM. Larry
In other words your saying it’s always present but an optical illusion at higher rpm. I guess I need to understand that more. Maybe I’ll use my camera and work the shutter speeds to see if I can find something. It’s probably just the pulley is not concentric. Cheers!
Ok Not a Buick or even Gas. Cummins owners manual states at X0,000 miles inspect vibration damper. I've replaced mine on the cummins & a few on SBC With fluiddamper..
The optical illusion can be seen in the video I posted, if you focus only on the timing tape you see what I mean.
The pulley bolts to the solid steel on the flange that is on the crank. the crank is bent? I don't think so.
