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Answered 2015-07-14 15:06:04

I hate to say this but a tapping sound usually means there is a rocker (or rockers) that are not adjusted properly. Hopefully there is no damage to rockers, springs, or valves. Make a close visual inspection for anything that looks 'NOT like the others'. The manual gives the proceedure and may also require that the engine be at a certain temperature before starting the adjustment, since heat causes expansion. Try again and follow the manual EXACTLY. Practice makes perfect and you will get better at hearing what the engine is 'saying' to you. Adjustments will change as the engine goes from cold to operating temperature. The tapping could mean there is a gap larger than specified for optimal performance. In the old days some engines' valves were adjusted while running! This way you felt and listened for the tapping to stop when it was right- (not recommended for your engine). Just ask Grandpa about working on old farm tractors. I , please post with the outcome- for others to learn.

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