Use a piece of wood to scrape off all traces of the old gasket from the head and cover. If total removal proves difficult, use a broad screwdriver blade, but take care not to scratch the seating.
Figure 5 explains the JTEKT seal numbering system.Seal numbers consist of (1) the seal type code, (2) the spring code, (3) the lip type code, (4) the dimensional numbers, and (5) the special type code,and Table 6 shows examples of each of these codes/numbers.