Describe three different types of valve stem seals.
What will be an ideal response?
The O-ring seal helps to deflect oil away from the valve stem by sealing the valve spring retainer to the stem just under the keepers.
Umbrella seals hold onto the stem just under the retainer and act just like their name by causing the rain of oil to drip around the guide. This type of seal moves up and down with the valve.
The positive seal attaches to the valve guide and prevents excessive oil consumption by wiping oil off of the stem as the valve moves up and down inside of it. This is considered to be the most effective type of seal.
You might also like to view...
The thermocouple is made by joining two dissimilar ____ together at one end.
a. alloys b. metalloids c. metals d. nonmetals
Any time an E7018 low-hydrogen-type electrode is to be used, the weave pattern, if used, must not be any larger than ____ the diameter of the electrode.
A. one-and-a-half times B. two times C. two-and-a-half times D. three times
Horizontal branches in a roof drainage system are usually installed with a slope of 1/8 inch per foot, which is equivalent to a slope of _____.
a. 0.5 percent b. 1 percent c. 3 percent d. 5 percent
What temperature scale uses 32° as the freezing point of water and 212° as the boiling point of water?
A) Kelvin B) Fahrenheit C) Rankine D) Celsius