Lt1 engine -- harmonic balancer wobbles at idle -- ok with throttle? - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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  #16 (permalink)  
Old 03-12-2012, 06:29 PM
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Vibration

Hey Man, Is there a vibration in the drivetrain?

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  #17 (permalink)  
Old 03-12-2012, 06:31 PM
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Hey Nolan!

Honestly i don't think so -- it sometimes has a little shake at idle, but it's the first v8 i've owned so I can't compare it to the 4 and 6 cylinder cars that I've owned. I had an 84 VW Vanagon that shook more than this one! The engine doesn't shake at all when driving at any speed.
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Old 03-12-2012, 06:38 PM
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Who Knows

Maybe you just had bad luck on the balancers. I've spun more than one on the rubber from revving the piss out of them. It makes the ring move which gets them cockeyed. I have an ATI on my SS with the hub and it will do 6600+, rev limiter is set at 6900.
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Old 03-12-2012, 06:45 PM
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Hey Nolan,

Here's hoping. I'm gonna put on the Impala balancer tonight and see if the wobble goes away. I hope nothing has happened to the internals because of the wobble...

PS how you been?
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Old 03-12-2012, 06:56 PM
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It's All Good

It's All Good here, I think I read somewhere that the balancer hub on the some of Caprice was a six bolt hub versus the three on the Camaro. I think my ATI and hub are six bolt. I think if you keep plugging away at your little issues, your Jag is going to be real sweet. I mean, you got it running and driving, thats great, don't sweat the small stuff, just don't give up. olNolan
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Old 03-12-2012, 07:00 PM
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Ha no giving up here! I gotta update my blog with the discoveries I've made -- one really cool thing all us LT1 owners might enjoy is a Gas usage computer --

The Jag XJ6 had a gas useage computer, which told total fuel consumed, instant fuel read (updated every 3 seconds) and an average meter.

The XJ6 had a trip computer, located in the dash, which receives it's pulses from a little ICU in the trunk. This ICU gets a feed from one of the injectors and makes the calculations, which then sends it to the trip computer.

I can see my actual gas usage as I drive now. Pretty neat! I had to figure out how many pulses an XJ6 put out vs how many the equivalent amount would put out for a v8.
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Old 03-12-2012, 07:17 PM
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Using a puller

I forgot earlier, but you may have screwed up the ring using the puller. The hub is a slight press fit with no key on the stock engines. The ring(pulley) is a slip fit with just the bolt and washer holding it on. It's neutral balanced so you can line it up on any of the three bolts. When you finally get a straight running ring, buff the hub surface with some emery cloth and use anti-seize on the hub/ring contact points and next time you have to pull it will come off by hand.
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Old 03-12-2012, 08:11 PM
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The ring

The outer ring is pressed on to the inner ring with rubber in between. The inner ring bolts on the hub with a slip fit. Dam this chicken is good.
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Old 03-12-2012, 08:22 PM
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puller

Should have used a puller like this in the threaded holes, going get more chicken;
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Old 03-13-2012, 10:23 PM
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Old 03-14-2012, 04:01 PM
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I have now tried 3 rings (old stock ring, replacement 1 and replacement 2) and all have the same type of wobble. I believe that it's not this part that is faulty, but the crank hub itself. Perhaps it is slightly tweaked? I don't know what else could cause this wobble.

Would it be terrible to drive it around like this a bit more?

Ugh, not looking forward to replacing this hub...
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Old 03-14-2012, 06:29 PM
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Would it be terrible to drive it around like this a bit more?


Not terrible, but not good.
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Old 03-14-2012, 07:07 PM
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I'd say that engine has been hit.. in a wreck
and either your hub is tweeked or the crank nose is.. whats the run out on the crank end..
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Old 03-14-2012, 07:35 PM
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Car wasn't in a wreck -- i pulled it out of the car myself.

My guess is that when I removed the crank pulley, I messed up the hub somehow -- I tapped on the pulley with a rubber mallet to try and loosen it up, but nothing really hard -- that's why i can't believe that a piece of cast iron can bend like that with just a few raps with a rubber mallet!

i can't tell what the runout is -- it's not much, but it is noticeable at idle...

Last edited by tylerwerrin; 03-14-2012 at 07:43 PM.
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Old 03-15-2012, 10:28 AM
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how can i measure runout on the crank nose? i'm gonna pull the hub in a week or so and I'll inspect then.
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