My 99 Buick Century harmonic balancer won't go back in


Asked by Mario9924 Aug 09, 2020 at 11:54 PM about the 1999 Buick Century Custom Sedan FWD

Question type: Maintenance & Repair

Hey guys,

Got a 99 Century.
Crankshaft position sensor went bad so I replaced them, I bought a
harmonic balancer puller kit and got the balancer off just fine.

Now I saw some YouTube video of people doing the installation without
special tool - gently hammering in the HB with a wood in between, then
tighten the center bolt to push the HB all the way. The only problem was that
the screw going back was VERY tight, it was impossible to turn by hand
anymore after a few turn.. so I had to resort to air tools. I made sure nothing
was stripped, everything went in all the way.

I started the car, the car cranks and starts just fine, but about 25mph or
faster the car vibrates hard, so I know I did something wrong..

I pulled the HB back out, and instead of hammering it in and impact gun-ing
my way back in, I rented a proper "harmonic balancer installation tool".
The problem is.. the pulley just doesn't want to go in much, the tool's
instruction says to just use adjustable wrench and turn them by hand, but it
just gets too hard to turn about half way in... there seems to be only one
'notch'(or key?) so I know I am not putting them in the wrong direction or
anything.. I used the original screw to check that I didn't strip the thread
inside.. hopefully I am right so it's not the worst scenario?
Any idea on this?
The torque spec for HB says to turn the center bolt to 67ft lb.. but it's like that
level of resistance after a few turns already so I know something is off here..

any clue or idea here is much appreciated.. I was gonna sell this car and had
a buyer coming tomorrow but now I'm stuck until I repair this..

any thoughts!? thanks guys

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