1. Remove the toothed belt and camshaft sprockets.
2. Turn away bolts and remove a back cover of a belt.
3. Determine the depth of the oil seal pressing in, then carefully remove the oil seal from the oil pump housing by prying it with a screwdriver.
4. Clean the oil seal bore and lightly coat the outer surface of the oil seal with engine oil. Lubricate the seal lips with universal grease.
5. Carefully, without distortion, press the new oil seal into place using a mandrel with a diameter slightly smaller than the diameter of the oil seal.
6. Install other parts, start the engine and check for leaks.