A possible concise summary is:
The speaker is trying to revive an old International 47/48 truck that has been off the road since 1968. He shows the condition of the truck, the engine, and the starter. He tries various methods to loosen the pistons and valves, such as heating, hammering, and using different fluids. He manages to free four out of six pistons, but the engine still does not spin over. He suspects that the crankshaft is seized from water in the oil pan. He concludes that the engine will have to be replaced and announces his next projects.
Here are some key facts extracted from the text:
1. The text is a transcript of a video about an old international truck that the speaker is trying to get running.
2. The truck is a 1947 or 1948 model with a five-cylinder engine, because one of the spark plug holes has a bolt in it.
3. The truck has been off the road since 1968 and has a lot of rust and pack rat nests in it.
4. The speaker tries to free the engine by using a battery, a starter, a hammer, and various fluids such as marvel mystery oil and pb blaster.
5. The speaker manages to loosen four out of six pistons, but the engine still does not spin over.
6. The speaker suspects that the crankshaft is seized from water in the oil pan and concludes that the engine needs to be replaced.