Ensure you have two 6 x 1.0 mm bolts. Start by aligning the engine at TDC and removing the valve covers
Timing Belt, and camshaft sprocket. Remove the intake cam and exhaust camshaft for each head, and align cam timing marks. Repeat for the exhaust camshaft. For exhaust camshaft gear disassembly, mount the camshaft in a vise, rotate the sub-gear, and remove the first service bolt. Remove the sub-gear snap-ring, wave washer, sub-gear, and camshaft gear spring. For installation, reassemble the exhaust camshaft gears, align the holes of the gears, and install a service bolt. Apply grease to the lifters, install them in the cylinder heads, and apply lubricant to exhaust camshaft lobes, bearing journals, and gear thrust faces. Install bearing caps and a new camshaft oil seal. Repeat for the other cylinder head. Remove the service bolt, and reinstall the camshaft sprockets and the timing belt.