Shibaura are a partnership between Toshiba and IHI. IHI are a huge engineering firm who are best known for shipbuilding. They built most of P&O's Containers ships in the 1990's. I have no experience of the Shibaura range of tractor engines but the two parent companies are certainly known for quality.
Yes, Shibaura build engines in a joint venture with Perkins and the engines are sold now as Volvos. Two main ranges the 20XX series that ran to 2006 and the D1 range that is current.