The harmonic balancer on my 190 was on pretty tight. I got a 3 jaw adjustable puller from AutoZone on their loaner program. That did the trick. I had to file down the woodruff key so that the balancer would go back on.

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David
'00 Mazda MPV Family's car
'83 300D 235,000
'84 109E 175,000
'74 280C 125,000 in garage; needs rehab or sell for parts???