Question : Harmonic Balancer Ring Shifted?

[pgtr]

When checking my timing I again am seeing a timing mark that is 40 deg or more BTDC - waaaay off the scale and almost beyond view. Engine has run fine for years like this. I'm guessing that the ring has shifted moving the timing mark considerably... Car is 25 years old, 2.8L w/ 180k mi.

Is it likely that the balancer has shifted it's outer ring due to age etc?

Any problem with removing spark plug #1 and use a depth dial indicator to precisely find true TDC and 'remark' the balancer?

Is it something I should be concerned about replacing? (it's been like this for years AFAIK)

The parts stores also sell some sort or repair sleeve/install kit... What is this and do I need it if I were to replace the balancer?

Do I need to get any special pullers to remove or install one?

Thanks

[95Grand-Am]

The sleeve kit is to repair the groove that the oil seal wears into it over time. You would only need it if that seal is leaking oil and there is a groove cut into the dampener. You would need a puller to replace it.