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- 25.
Clicking sounds in the top of the engine - Top
- This sound is most likely nothing more than a valve tap from one or more valves. The Atomic 4 has mechanical valve tappets, and when the clearances are set conservatively to the specified gaps of .010” and .012” for intake and exhaust valves (meaning on the loose side), there will be an occasional clicking or tapping sound heard. These sounds should reduce when the engine is fully warmed up, and should not be heard at normal cruising RPM. In short, we consider a slight valve tap at idle to be a relatively “healthy” sound. It should also be pointed out here that the Atomic 4 has a very reliable history in terms of valve and valve seat wear. In spite of widespread concern over the effects of using lead-free gas, we have never seen any indication of valve seat damage (“peening”) as a result of lead-free gas, even in engines with regular cast iron seats. Use of Marvel Mystery Oil in the fuel tank (6 to 8 ounces per 10 gallons) is very effective in keeping valves working freely and reliably. - Updated:
November 4, 2003
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