If you take off the tappet cover and start the motor you can work out if it is a tappet. Just place your finger on each tappet while the motor is running, if one is lose you will feel a sharpness in the movement. It is little difficult to explain, but it will feel like it is being hit rather than pushed.
While you are at it, check that the rods appear to be turning as the motor is running.
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