Use a seal press. One press for the cam seals and one press for the front crank seals.
You may want to replace the front timing plate, that 'carries' the intermediate cam seal and crank shaft seal. Use Volvo gasket. You can use the orange seals as came on your 1908 242 DL. Of use the newer viton material seals that are thinner.
Also, to remove the crank pulley, you should use the counter hold method on the crank pulley and both camshaft pulley. Your 1980 has the shimmed all metal crank pulley. So, one counter hold to rent or buy for the crank pulley and the two camshaft timing gear cogs.
Find a Vovlo Penta (marine) store or shop. They may rent the tool to you.
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