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Dear Metallo,
Hope you're well. I've stood aside as there are many better-qualified to offer advice as to head-gasket replacements.
If you have a "heat gun", that may help you to remove rock-hard seals. The heat will cause the seal's polymer to expand faster than the surrounding steel. That could break the "bond" between the seal's edge and the surrounding metal, allowing you to extract the seal.
Heat may slightly soften the seal's polymer shell, allowing a hook tool to be inserted between the seal's lip and the shaft. The lip is the softest part of the seal.
The hook tool should be inserted with the round part of the tool "flat" against the shaft. This positioning will keep the hook's point from contacting the shaft. The hook's smooth, round sides won't damage the shaft.
The tool should then be pushed inwards, between the shaft and the seal's lip. If that can be done, turn the tool, so the hook moves towards the seal's outer edge. You may then be able to pull the seal towards you. It may take several efforts - around the circumference - to "walk" the seal out of the seal carrier.
Hope this helps.
Yours faithfully,
Spook
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