[Shotimes] Vibration or picky...again (update)

[cmichaelo@optonline.net]

Lee, 

See below.

----- Original Message -----
From: Leigh Smith <leighsm@comcast.net>
Date: Tuesday, April 12, 2005 7:51 pm
Subject: Re: RE: [Shotimes] Vibration or picky...again (update)

> The internal roller bearings won't be in the same position on 
> every 1 turn of the rotor.
I was hoping you were gonna say this.  I have suspected this for a while now, since it was the only way I could explain the asymmetry in the dial indicator readings.

> Is the noise / vibration related to wheel speed? 
Yes. When vibration occurs in steering wheel, it happens at 65mph.  But it doesn't always happen.

> Any difference when turning right or left?
The only test I did is to "wriggle" the car from side to side on the highway when the vibration occurs at 65mph.  The vibration seems to remain the same though. I have not been able to make sharper turns at 65mph. 

There's no noise or vibration at other speeds, incl lower speeds when turning sharply.

Michael

> ----- Original Message ----- 
> From: <cmichaelo@optonline.net>
> To: "Tom Smith" <tjsmith@monmouth.com>; "shotimes"
> <shotimes@autox.team.net>; "David Rosicke" <d.rosicke@snet.net>; "Bill
> Strobel" <theamcguy@yahoo.com>
> Sent: Tuesday, April 12, 2005 10:54 AM
> Subject: Re: RE: [Shotimes] Vibration or picky...again (update)
> 
> 
> > And the saga continues...(update).
> >
> > Tom, I checked for bearing grease on the inside of the knuckle 
> (i.e.,looking into the knuckle from the engine side.) No grease to 
> be seen.
> Totally dry in there.
> >
> > Checked the seating of the rotor against the front right hub. 
> The was a
> minor wobbling. Turned the rotor 72deg and it went away.
> >
> > Checked the axle nuts all around.  All were at least 200 lbft.
> >
> > Checked all other suspension bolts (strut pinch bolt, control 
> arm bolts,
> tension strut nuts)...everything is fine.
> >
> > I checked rotor lateral runout again with a dial indicator.  
> Rears are
> <0.001". So they are good.
> >
> > CV joints:
> > ------------
> > I did not check the CV joints yet.  They were checked 20k ago 
> and were
> found in good condition by the mechanic. Bill, how do I check if 
> CV joints
> are ok, or should I just replace them since they have 130k on them 
> at this
> point?
> >
> > Carrier bearing:
> > --------------------
> > Nor did I check the carrier bearing for the intermediate drive-
> shaft.>
> > Dave, if this bearing is worn out, I should be able to measure 
> that with a
> dial indicator, no?  Do you know what the spec is?  And I suppose 
> it's a lot
> of work to replace that bearing, no?
> >
> > Other clues:
> > ---------------
> >
> > Here's two new clues to as what may be wrong. Hope you guys can 
> help here:
> >
> > 1st clue - front right lateral rotor runout:
> >
> > Let's say the dial indicator initially shows 50 (for 50/1000 of 
> an inch).
> Then on the first single 360deg revolution the runout will 
> typically stay
> within 49 and 51. But as I continue turning the rotor on the 
> second 360deg
> revolution, it jumps to 52 or 53 and then stays between 51 and 52 
> (or 53)
> for the revolution. Then on the third revolution it returns to the 
> 49 to 51
> of the first revolution.
> >
> > So this is so weird. You'd think that the fluctuation within a 
> single360deg revolution would be reapeted in the next revolution 
> and in the next
> revolution etc. But it doesn't.
> >
> > Whether I turn the rotor by hand or let the engine turn it in 
> 1st gear
> makes no difference (though it is kind of hard to track the dial 
> indicatorat 800rpm in reverse.)
> >
> > 2nd clue - turning resistance.
> >
> > When driving, and especially right after start-up, there is a 
> resistancein the steering wheel when reaching a specific point 
> when turning left.  You
> sort of have to turn harder to overcome the resistance.  Once it's 
> overcomeyou can continue turning normal.
> >
> > It almost feels like the steering wheel is locked at this 
> particular spot.
> And it's impossible to steer "finely" when at this particular spot.
> >
> > This problem appeared suddenly about 4 years ago.  Could this be 
> due to CV
> joints? Or is steering rack more likely culprit?
> >
> >
> > Michael
> > 94MTX,green,BOS+,Koni/Intrax,Baer,Corbeau
> > SHO items for sale: http://hometown.aol.com/cmichaelo/for_sale.html
> > _______________________________________________
> > Shotimes mailing list
> > Shotimes@autox.team.net
> > http://www.team.net/mailman/listinfo/shotimes