1. General Information
  2. Vibration Diagnosis and Correction
  3. Diagnostic Information and Procedures
Engine Order Classification

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Engine First Order Classification

  1. Convert the engine speed in revolutions per minute (RPM), recorded during duplication of the disturbance into Hertz , revolutions per second (RPS), by dividing the RPM by 60 seconds. Refer to the following example:

  2. 1,200 RPM divided by 60 = 20 Hz (or RPS)

  3. Co...

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Document Title: Engine Order Classification

engine

first

order

classification

speed

recorded

duplication

disturbance

example

rpm

hz

compare

dominant

frequency

during

converted

determine

related

present

usually

component

firing

proceed

cylinder

complete

revolution

crankshaft

multiply

calculated

isolation

possible

driven

accessory

system

accessories

pulley

diameter

measured

properly

arrangement

balance

shaft

degree

torque

sensitive

abnormal

single

misfire

fuel

variance

imbalance

bank

characteristic

powertrain

engine speed

recorded during

disturbance engine

speed converted

related engine

order related

related disturbance

engine order

engine firing

firing frequency

calculated related

possible engine

engine related

engine driven

driven accessories

crankshaft pulley

engine arrangement

single cylinder

cylinder misfire

component imbalance

sensitive possible

accessory related

bank bank

related possible

sensitive characteristic

characteristic engine

possible powertrain

powertrain isolation

isolation related

related characteristic

duplication disturbance engine

disturbance engine speed

engine speed converted

engine order related

related determine disturbance

engine firing frequency

disturbance engine firing

calculated determine related

calculated related engine

order related disturbances

related engine order

engine order classification

engine related disturbance

engine driven accessory

engine driven accessories

driven accessories related

accessories related engine

accessory system isolated

operating properly identifiable

with balance shaft

single cylinder misfire

torque sensitive possible

sensitive possible engine

possible engine driven

driven accessory related

accessory related possible

related possible engine

torque sensitive characteristic

characteristic engine arrangement

possible powertrain isolation

powertrain isolation related

isolation related possible

accessory related characteristic

related characteristic engine

isolation related characteristic