1. See Figure 3-40. Remove old gasket material from cylinder head (9). Gasket material left on sealing surfaces will cause leaks. Scraping may result in scratches or nicks.
NOTE
Bead blasting materials could also enter threaded holes. This would adversely affect fastener engagement and torque indication. Cover all threaded holes before bead blasting.
2. Remove all carbon deposits from combustion chamber and machined surfaces of cylinder head. Do not remove any metal material.
3. To soften stubborn deposits, soak the cylinder head in a chemical solution, such as GUNK HYDRO-SEAL or other carbon and gum dissolving agent. Repeat previous step as necessary.
4. Thoroughly clean the cylinder head, spring retainers, tapered keepers, valves and valve springs in a non-volatile cleaning solution or solvent. Follow up with a thorough wash in hot soapy water.
5. Dry parts with low pressure compressed air.
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