You have no compression. Interestingly, if you watch the video, the cam gear turns a bit after the cranking stops and delays to start moving when you first engage the starter. Something is broken. There should be absolutely no delay.
Now, an interference engine will cause damage to the valves if the timing is off. I suspect that although the timing belt is still attached, it either jumped time causing internal damage or the way the cam gear has delayed movement when you first crank and then a delayed stop when you release the starter, the camshaft is broken or the shear key on the crankshaft timing gear is bad Something happened there.
If you want, you can do a compression test to confirm what I'm saying. But just based on the sound, it has no or very little compression.
Again, based on the way there is a delayed start and stop, I have a feeling the shear key on the bottom timing gear (crankshaft) has sheared. Do me a favor. see if you can move the cam gear left and right easily. Keep in mind, if nothing is broken, the crank pulley should move exactly at the same time without play and you really shouldn't be able to do it by hand because you will be turning the engine engine. Try it and let me know.
One other thing, if the timing belt crank gear has sheared the key, that small amount of movement will most likely not turn the belt driven accessories until it gets tight again.
I attached two pics. First, is the timing belt so you can see there really isn't much to it. You will see the crank and cam pulleys and the tensioner. If the cam gear moves at all, the crank pulley should to. That doesn't appear to be what is happening.
The second pic shows the shear key that the crankshaft timing gear goes over. That is what I think broke.
Check that and let me know what you find. Also, if I am correct, it may be cheaper to purchase a good used engine rather than trying to repair this one. Watch your video and you will see what I mean. Once you see it, I think you will agree that the shear pin broke or even the camshaft is broken.
I will watch for your reply. If you want to check the crank shear key, you will need to remove the harmonic balancer which drives the belts from the crankshaft. To check the cam, you will need to remove the valve cover. Let me know which you want to do and I tell you how it's done.
Images (Click to enlarge)
Saturday, October 19th, 2019 AT 5:50 PM