The service manuals for most older Icom radios can be found online. What's the model? What kind of radio is it (HF, 2m FM, etc)?
Do you have an RF signal generator that you can use to feed a modulated signal to the radio? If so, you may be able to tune it by ear, if you can get the radio to produce some kind of audio from the signal generator. Crank up the signal generator until you can just begin to hear the signal, then start adjusting the first transformer until you hear a peak in signal strength. If the signal gets too strong to hear a difference as you near the peak, reduce the generator level until you get a noisy signal again. Move on to the next transformer down the line, and repeat. Once you have them all peaked, go through all the adjustments once more.
That's assuming you can get anything out of the speaker (if it's really badly out of alignment it's possible you might not be able to get your signal generator to produce audible output from the radio). Also assuming there isn't a fault in the radio, which is entirely possible (why did the previous owner mess with the adjustments so much?).