evaluation completed in October 1962, PLAN decided to improve the design based on Type 0111 and then mass-produce the improved design. Redesign work was assigned to No 708 Institute, and in July 1963, the improvement redesign Type 0111Jia (甲) was formally designated as Type 062. Type 062 gunboat The Type 062 gunboat (NATO reporting name: Shanghai I & II class), is a family of gunboats built to replace the preceding and gunboats. During the late 1950s, the PLAN found they needed a more powerful gunboat, as the 50-80-ton class Shantou and Huangpu-class gunboats were too small and lacked both firepower and endurance. Several prototypes are built by different shipyards. They were the Type 0105 from Luda (3), the Type 0108 from Qingdao (1), the Type 0109 from Shanghai (10), and the Type 0110 from Guangzhou (3). Displacement of the prototypes varied from 100 to 150 t, speed varied from , with different weapon arrangements including 57IIx1, 37IIx1, 14.5IIx2 or 37IIx2,14.5IIx2. In 1960, a hybrid of all the prototypes, Type 0111 was laid down at Dalian shipyard, Luda. Full production variants became known as the Type 062. A total of 30 were built, initial boats being known as the Shanghai I class and later slightly improved boats being known as the Shanghai II class. Some boats even remained in active service well into the early 1990s. The Shanghai I class was slightly smaller than its successor, the Shanghai II class, displacing 125 tons instead of 135 tons, and had a twin Chinese Type 66 57 mm gun mount forward. All other specifications are identical to the Shanghai II class, which replaced the 57 mm with twin 37 mm gun mounts. The L-12V-180 diesel engines used on the Type 062 were prone to overheating, thirsty for fuel and had a poor working life. So the smaller L-12D-6 diesel engine was introduced. The new engine was more fuel efficient and had a longer life, but rated only , resulting in a maximum speed of only . The low speed disappointed PLAN and was one of the reasons construction ended at 30 boats. Exports A number have been exported to foreign customers, with most still remaining in service: Albanian Naval Defense Forces Bangladesh Navy Bangladesh Coast Guard Navy of the Democratic Republic of the Congo Egyptian Navy Korean People's Navy Pakistan Navy Republic of Sierra Leone Armed Forces Sri Lanka Navy Tunisian Navy Timor