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When starting the engine, there is a loud noise like "Gyaa!". Even after repairs, the problem has been recurring for the past few years. I went to investigate the site, thinking that it might be an environmental factor rather than a vehicle-related one. I have been racking my brains over the years, but I have finally found the cause. If it was a common cause, I would not have made a video about it, but since it was an unexpected cause, I made a video to share the information with my fellow tradesmen. What is the cause? [Tools featured in the video] ① Gates Unitta Sonic Belt Tension Meter U-550 → https://a.r10.to/hwkugm The tool used in the video is the "U-508", but it seems that a successor model (U-550) has been released. Masum Motors' website https://www.masumitu-j.com/ Other verification disassembly and repair videos (YouTube) [Verification video] The inside of the broken CVT was in a terrible state! We disassembled and verified the transmission K111, which was no longer able to run. • [Verification video] The inside of the broken CVT was in a terrible state! A toyota that became unable to drive... [Verification video] What on earth is inside a broken AT transmission!? We investigated it and found something terrible happening inside. Part 1 [Repost] • Video [Verification video] What on earth is inside a broken AT transmission!? We investigated it and found something terrible happening inside. Part 2 [Repost] • Video [Comprehension challenge] Can you understand it? ? The inside of a Prius transmission that was dissected into pieces was a simple yet complex and mysterious system that brings together all of human wisdom! ? Revealing the structure of Toyota's hybrid THS II! • [Comprehension challenge] Can you understand it? ? The inside of a Prius transmission that was dissected into pieces... [Warning] Screams from inside the engine! ? We were left speechless at the screams and cries inside the engine We disassembled a K6A engine that became unable to drive and investigated it! • [Damage escalates] "The cause was a small malfunction, but we ended up having to do major repairs" Nissan Note... [Damage escalates] "The cause was a small malfunction, but we ended up having to do major repairs" Nissan Note's head-scratching breakdown case. How can we prevent this... • [Damage escalates] "The cause was a small malfunction, but we ended up having to do major repairs" Nissan Note...