- Maintenance is another critical aspect of spark plug use
Shaft hardness should be at least 30 HRC. In usage conditions where wear can occur easily because of dust or contaminated oil, hardness should be 50-60 HRC. Bauerle and Bruhnke7 found that aeration reduces the effect of oil additives on fluoroelastomer properties. Some of their data is reproduced in Fig. 14.4,5 showing the effect of aeration of an SF-grade 5W30 oil on the retention of elongation of a VDF/HFP copolymer (FKM-E430), a VDF/HFP/TFE terpolymer (FKM-B600), and a VDF/PMVE/TFE fluoroelastomer (FKM-GFLT). The HFP-containing polymers show much better retention of properties with aeration.
Oil seal size





Before installing the oil seal, check the seal carefully for damage. Make sure there are no cuts or tears around the seal lip, which is the two layers inside the oil seal.
Another thing to consider is the outer diameter of the oil seal. Any damage detected prior to installation will make it impossible to use further.
Among the most common causes of oil seal failure are:
The oils seals require certain prerequisites to be maintained for their proper working. They are as follows:


There are three main different types of headlights. These car headlights types are Halogen, Xenon & LED headlights. Each work quite differently in the way they produce light and therefore produce different types of light on the road.