Front side seals are a pain to replace because the gear has to come off. So, first thing to do is remove the cover and verify where the leak is coming from - don't assume anything.
Second, check the vacuum pressure in the crankcase. Get the engine warm, pull out the dipstick and cover the hole with a latex glove finger. If the finger starts to inflate just a little, you have a pressure problem. Don't let the latex get sucked into the dipstick if all is well.

If you have positive pressure, clean the PTC nipple. It probably needs cleaning anyway.

It is usually pressure that causes the cam seals to be pushed out and leak, not a seal failure. Once the seal has moved it can not be pushed back, the seal needs to be replaced. Often, when the crankcase pressure is back to 'normal' the leaks stop.

What do you need to replace it? Normal tools and paint to mark the bolt location. The cam sprocket bolt holes are oblong to allow movement, you need to scribe the current position or use paint to mark the exact bolt location before removal. Use a suitably sized socket to tap the new seal in place.
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