A valve seal prevents oil from running past the valve stem into the combustion chamber, and it is important to replace these because worn seals lead to oil consumption, smoke generation, and reduced engine performance.
Valve seals / Valve stem seals suitable for, among others, the following models:
V-belt with designation 863 x 9.7 x 8 mm (narrow profile 9.7 x 8 mm, length 863 mm). For Iseki TX1300/TX1500, SIAL, TF and SG models, Bolens G series, Mitsubishi KE70/KE75/MT372 and Satoh ST1510/S370. Reference numbers include 5663-011-351-00 and MD011351.