Determine Replacement Seal

The illustrations below demonstrate the correct procedure of measuring and properly identifying a mechanical seal that is best suited to the application of your needs.

• Worksheet to help you Correctly Identify Your Seal

Remove seal to be replaced from the motor shaft and/or sleeve. Make note of materials used for the old seal parts. Identify Head Type [ ] and use caliper to measure inside diameter (I.D.) and outside diameter (O.D.)

Type A and B  /  Type C, D and E  /  Type K, R and T  /  Seal Seat

• Measure inside diameter (I.D.) (A)
• Measure outside diameter (O.D.) (B)

The operating height is generally the same for all A and B seals of the same shaft size. More positive identification will result from calculating the seat dimensions following.

• Measure inside diameter (I.D.) of the rubber bellows (A)
  (Add approximately .016" to compensate for rubber compression.)
• Measure the head O.D. (B)

• Measure the total length (C) of the rotating portion of the assembled seal (DO NOT include the seat)
• Disassemble seal and measure the free length of the spring (D)
• Take half of the measurement in STEP 2
• Subtract the figure obtained in STEP 3 from the measurement (C) in STEP 1

• Measure inside diameter (I.D.) of the rubber bellows (A)
  (Add approximately .016" to compensate for rubber compression.)
• Measure the head O.D. (B)

• Measure the total length (C) of the rotating portion of the assembled seal (DO NOT include the seat)
• Multiply the total length (C) by .730

• Measure the O.D of the gasket while assembled on seat ring (D)
  (Substract approximately .016" to compensate for rubber compression.)
• Measure the combined seat and gasket thickness (E)

NOTE: It is very important to note the operating temperatures and environment details. This will determine the proper gasket material.

Mechanical Seal Components  |  Various Seal Designs  |  Determine Seal Replacement  |  Environment Determines Seal Type  |  Seal Composition Limits  |  Seal Head Types  |  Seal Seat Types  |  Seal Face Wear Patterns  |||  Water Pumps