This is the assembly procedure. Some of the info here you don’t need. You are only taking off the cam gear that is leaking. Before you remove the belt, put the engine at 0 deg tdc #1 cyl. Take note of the timing marks for all pulleys. Take many pics. Sometimes I mark the belt tooth and pulley tooth with white out on all the pulleys and just put them back together the same way. Make sure the flywheel pointer is at zero while marking and only turn the flywheel in a clockwise direction. If you overshoot zero, go around 2 more revolutions clockwise to get your marking position. Never back it up to zero, even slightly. When you get to zero, notice the arrows on all the pulleys. If they resemble the position of the timing procedure pic in the manual, mark the belt now. If they don’t, go 1 revolution and check the marks again. Basically the idea is to put every male timing belt tooth back into the same female tooth of the gear. (Keeping the flywheel locked on zero.)
Once you remove the belt, use an electric battery impact to remove the bolt that holds the gear to the top of the cam. Hold the gear in place and zip out the bolt. Gear will lift off and the seal is right under the gear. Dig it out with a flat screwdriver carefully not to scrape the cam gear or the outer aluminum housing of the head. Then clean up the area that the seal was in with brake cleaner and a rag. Then put the new seal in with a small piece of pvc pipe that is the same diameter of the seal. Should slide in easily. I sometimes use 3m 847 sealer On the outside of the seal between the seal and the aluminum. Also grease up the seal spring. Install spring down.
now put the gear back on. Tighten up the bolt with 271 locktite with the electric impact while holding the gear steady. They say to use a special tool and torque it, but that is one of the bolts that just need to be tight and locked with locktite.
While doing these procedures, be sure not to turn anyof the gears including the one you are working on.