Is harmonic balancer wobble normal? Topic is solved

[dikidera]

After I did the timing job, plus new serpentine belt and tensioner on my S60 the harmonic balancer was wobbling. I replaced it with a aftermarket one from FCP. No wobble after that. I think mine was caused by an old balancer and new (tight) belt. It just showed it’s age.

Did you notice a change in engine vibrations? Particularly an increase in them?

No not really. Both the S60 and XC70 have a little vibration at idle in gear. I haven’t gotten to all the bushings and sub frame mounts on the XC yet, but will in the near future. I did replace sub frame bushings and mounts except the two big front and back ones on the S60 and I didn’t really notice much of a difference.

Well since we don't have a brand new S60 P2 we can't say if there should be idle vibration in gear. All I know is after replacing 3 of my engine mounts, I got more vibration than before with the broken ones. Yes I did not use genuine volvo for 2 of the mounts and I think this is it, but we will see.

[dikidera]

that wobble can originate in the crank gear the timing belt runs on.
Check that the timing belt isn't wandering on the cam gear sprockets.
Check the 4 10mm bolts holding the harmonic balancer are torqued tight.
Remove the belt and check the balancer grooves are clean, inspect the belt.
I see the inner edge wobble but the outer edge looks steady.
Check the belt tensioner for smooth operation.

Ok, so I checked...there were only 3 bolts! One was definitely missing and not there. Could this have caused the perceived wobble?

[abscate]

that wobble can originate in the crank gear the timing belt runs on.
Check that the timing belt isn't wandering on the cam gear sprockets.
Check the 4 10mm bolts holding the harmonic balancer are torqued tight.
Remove the belt and check the balancer grooves are clean, inspect the belt.
I see the inner edge wobble but the outer edge looks steady.
Check the belt tensioner for smooth operation.

Ok, so I checked...there were only 3 bolts! One was definitely missing and not there. Could this have caused the perceived wobble?

Oh yeah. Don’t listen to any Scots who might tell you to remove a third bolt to rebalance it , and then sell the bolt off.

[jonesg]

that wobble can originate in the crank gear the timing belt runs on.
Check that the timing belt isn't wandering on the cam gear sprockets.
Check the 4 10mm bolts holding the harmonic balancer are torqued tight.
Remove the belt and check the balancer grooves are clean, inspect the belt.
I see the inner edge wobble but the outer edge looks steady.
Check the belt tensioner for smooth operation.

Ok, so I checked...there were only 3 bolts! One was definitely missing and not there. Could this have caused the perceived wobble?

there ya go then.
check the big crank nut is tight too.