Rating:
Information jet Denso
Include in ##:
Number on scheme 126
09600-01591
as JET
Cross reference number
Part num
Firm num
Firm
Name
09632-30030
JET
Information:
Engine Vibration Troubleshooting
The troubleshooting chart provides a definite sequence to be followed for a logical procedure to determine the frequency and amplitude of vibration so that the source of the vibration can be located and corrected.1. The customer must be asked questions to determine whether his complaint is valid, or whether his diagnosis of the actual problem is correct.Some of the questions that must be asked are as follows: a. What components are vibrating?b. In what speed range does this vibration become excessive?c. Does clutch operation affect the vibration?d. What is the history of the problem?2. Run the engine through the idle speed range and note all vibrating components. Look for any loose or broken mounts, brackets, and fasteners. Repair and tighten any fixtures.3. Check idle speed range with clutch disengaged. If vibrations subside, there is a balance problem with the clutch disc. The clutch disc must be repaired or replaced.4. Further analysis requires the use of a vibration instrument. Any instrument which can accurately measure the displacement of the vibration (usually in mils-inch/1000) and the frequency (cycles per second) will be sufficient. The 4C3030 Vibration Analyzer Group can be used to provide a quick and complete identification of all vibration frequencies present in a constant speed measurement. Make reference to Operation Manual, Form No. NEHS0525 for additional information for troubleshooting vibration complaints with the 4C3030 Vibration Analyzer Group. The following steps assume the use of a vibration instrument such as the IRD Mechanalysis Model 320 or an equivalent instrument can be used to analyze vibration. Make reference to Special Instruction, Troubleshooting Engine Vibration In Vehicular Equipment, Form No. SEHS7914 for additional information for troubleshooting vibration complaints.5. Measure vibration of cab components which have the objectionable vibration.Run engine slowly through the speed range and measure vibration with
The troubleshooting chart provides a definite sequence to be followed for a logical procedure to determine the frequency and amplitude of vibration so that the source of the vibration can be located and corrected.1. The customer must be asked questions to determine whether his complaint is valid, or whether his diagnosis of the actual problem is correct.Some of the questions that must be asked are as follows: a. What components are vibrating?b. In what speed range does this vibration become excessive?c. Does clutch operation affect the vibration?d. What is the history of the problem?2. Run the engine through the idle speed range and note all vibrating components. Look for any loose or broken mounts, brackets, and fasteners. Repair and tighten any fixtures.3. Check idle speed range with clutch disengaged. If vibrations subside, there is a balance problem with the clutch disc. The clutch disc must be repaired or replaced.4. Further analysis requires the use of a vibration instrument. Any instrument which can accurately measure the displacement of the vibration (usually in mils-inch/1000) and the frequency (cycles per second) will be sufficient. The 4C3030 Vibration Analyzer Group can be used to provide a quick and complete identification of all vibration frequencies present in a constant speed measurement. Make reference to Operation Manual, Form No. NEHS0525 for additional information for troubleshooting vibration complaints with the 4C3030 Vibration Analyzer Group. The following steps assume the use of a vibration instrument such as the IRD Mechanalysis Model 320 or an equivalent instrument can be used to analyze vibration. Make reference to Special Instruction, Troubleshooting Engine Vibration In Vehicular Equipment, Form No. SEHS7914 for additional information for troubleshooting vibration complaints.5. Measure vibration of cab components which have the objectionable vibration.Run engine slowly through the speed range and measure vibration with