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What are the symptoms of valve collision?

1 Answers
AllieLynn
07/29/25 4:38pm
There is a rhythmic sound, usually intermittent, similar to the sound of the piston hitting the cylinder head, but slightly less solid. The sound worsens as the engine speed increases. The general cause is the piston hitting the valve. In addition to the same reasons as the piston hitting the cylinder head, there are the following causes: 1. The replaced valve seat ring is too thick: causing the valve head to sink excessively. 2. The valve clearance is too small or the adjusting bolt is loose: pushing against the valve pushrod, causing the rocker arm and valve stem to press against each other, resulting in the valve head being struck and making noise when the piston reaches top dead center during the exhaust stroke. 3. Improper assembly of the timing gear: misalignment with the marks.
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