- Low Maintenance With minimal need for adjustments and lubrication, V-belts require less maintenance than other power transmission systems.
Figure 1: O.D. (outside diameter) wall material
These are comparable to type R and RST, except the outer case does not have a metal reinforcement ring. To compensate, the outside is not made of normal rubber, but a hard, heavy-duty rubber fabric. The advantage is that these types can be made in a split version. They are almost always produced to order, and made of NBR or FKM.
An oil seal, also known as crankshaft retainer, is a small device, but essential to ensure the proper engine operation. It plays a key role in all moving parts of an engine, acting as a physical barrier. This mechanical seal fulfils the dual purpose of sealing a rotary shaft to maintain the necessary lubrication (avoiding leaks) and preventing other foreign matter from contaminating shafts and bearings in the rotary shaft equipment.
ISO 6194-1 1)

oil seal 20 34 7. Its dimensions indicate that it has a 20mm inner diameter, a 34mm outer diameter, and a 7mm width. This size is suitable for a variety of applications and can be easily installed in most types of machinery.
: spiral shaped, ensures constant pressure and maintains the optimal force to the shaft.
Replacing the fuel-pump gasket

If it was stuck to the cover, smear gasket sealant along the cover flange and upper gasket and leave it to dry for a few minutes.
Installation of the oil seal
What are Oil Seals and how should they be ordered?
Guide to oil seals for your application
3) Seal numbering system

VMQ, also known as silicone, is also used for oil seals, but this is less common because the mechanical strength of VMQ is low and this material has poor wear-resistance This makes it less suitable for dynamic applications, but it can withstand fairly low and high temperatures from -60 °C to 200 °C. Many types of VMQ are also suitable for contact with pharmaceutical and food products, so VMQ is an option worth considering. VMQ oil seals are usually available on request.