Timing Gear Back Lash

[Garagekulture13]

I had a knock also and it turned out to be my timing gear was worn badly. Here are a couple of videos of the sound the timing gear was making while running, hand cranking with the cover off and after a new timing gear.

The knock:
https://youtu.be/3R3eLKlvVmU

Hand cranking with timing cover off:
https://youtu.be/lDI6grnm-Z0

After new timing gear:
https://youtu.be/C-MMJRXug8E

I hope this helps.

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