Once you have selected the most suitable seal available, considering the environment, temperature, shaft speed, pressure, lubrication availability, as well as the size, of course, the seal should be stored adequately and then fitted properly. Here are a few suggestions that could help:-
Remove the cylinder head (See How to remove a cylinder head ), carefully peeling off the old gasket from the head or block. Make sure no dirt or carbon falls into the engine.
Insert a tyre lever or large screwdriver into the starter aperture so that it jams in the teeth of the ring gear on the flywheel .

oil seal 50 * 72 * 10.
R
Type A Oil Seals

Table 5: The major special seals, their shapes, and their features
What are Oil Seals and how should they be ordered?
The price of oil seals can vary based on several factors, including the type of seal, material quality, size, and market demand. High-quality oil seals designed for specific industrial or automotive applications may command a higher price due to their precision engineering, durability, and compatibility with various machinery and equipment. When considering the price of oil seals, it's important to prioritize quality and reliability to ensure optimal performance and longevity in the intended application.