Inspection Procedure 12
DIAGNOSISNOTE: Noise from the engine, muffler vibration, transmission, propeller shaft, wheel bearings, tires, body, etc., is easily mistaken as being caused by malfunction in the differential carrier components. Be extremely careful and attentive when test driving, etc.
Test methods to confirm the source of the abnormal noise include: coasting, acceleration, constant speed driving, raising the rear wheels on a jack, etc. Use the method most appropriate to the circumstances.
STEP 1. Check the tooth contact (engagement) of the drive gear.
If faulty, adjust or replace the part. Then go to Step 9.
If normal, go to Step 2.
STEP 2. Check the drive gear backlash.
If faulty, adjust it. Then go to Step 9.
If normal, go to Step 3.
STEP 3. Check the drive pinion turning torque.
If faulty, adjust the torque. Then go to Step 9.
If normal, go to Step 4.
STEP 4. Check the drive gear and drive pinion for tooth damage or breakage.
If damaged or broken, replace the part. Then go to Step 9.
If normal, go to Step 5.
STEP 5. Check the drive pinion bearing and side bearing for seizure, damage or breakage.
If faulty, replace the part. Then go to Step 9.
If normal, go to Step 6.
STEP 6. Check the differential case for damage.
If damaged, replace the part. Then go to Step 9.
If normal, go to Step 7.
STEP 7. Check the oil level.
Check that gear oil level is not 8 mm (0.3 inch) below the bottom of filler plug hole.
If low, refill Hypoid gear oil MITSUBISHI Genuine Gear Oil Part Number 8149630 EX or equivalent. Then go to Step 9.
If normal, go to step 8.
STEP 8. Check that Hypoid gear oil MITSUBISHI Genuine Gear Oil Part Number 8149630 EX or equivalent is being used.
If not, replace the oil. Then go to Step 9.
STEP 9. Check symptoms.
Check that no noise is generated.