Metal noise when attempting to start new engine

2007 VOLKSWAGEN POLO
90 MILES • 1.4L • 3 CYL • TURBO • 2WD • MANUAL
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POLO17
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Put a new engine in as old one had cam belt damage. It turns over but has started making a scrapping noise sounds like metal. It ran for a short time but would not stay idling. Now we have this horrible metal sound when trying to start.
Aug 20, 2018 at 1:12 PM
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STRAILER
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It sounds like the starter is not disengaging, but to be sure can you please shoot a quick video with your phone so we can hear the noise? That would be great. You can upload it here with your response.

Cheers, Ken
Aug 22, 2018 at 11:49 AM
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POLO17
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The noise gets louder, but it has also ran for about five minutes with revs held on.
Video (Click to enlarge)
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Aug 25, 2018 at 5:10 AM
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POLO17
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Now it will not start just turns over.
Video (Click to enlarge)
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Aug 25, 2018 at 5:12 AM
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STRAILER
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Oh ya, thanks for the videos they really help. I looks like you may have a blown head gasket between two cylinders but to be sure lets do a compression test. Here is a guide to help diesel engines have higher compression but it should still be uniform:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run down this guide and report back.

Cheers, Ken
Aug 25, 2018 at 1:11 PM