Corona L4-2366cc 22R (1982)
This bulletin has been prepared to assist in the diagnosis and repair of vehicle vibrations. It is intended as an informational guide only, and does not
constitute authorization for repairs or circumvent normal Warranty Policies and Procedures. To be effective, the entire bulletin must be read prior to
diagnosing a complaint vehicle.
Vehicle vibrations may originate in several of the automobile's systems or components. Therefore, it is important to develop an organized approach in
order to accurately locate and correct problems. The following chart, tables and procedures are provided for this purpose.
NOTE:
This bulletin has been prepared for use on vehicles with conventional rear wheel drive only. It does not necessarily apply to FWD or 4WD
vehicles.
Engine Vibration
TABLE A
-
ENGINE VIBRATION
Possible Cause
Repair
1.
Engine condition and operation Check engine condition/operation
2.
Engine accessories, belts, pulleys See Procedure A, page 4.
3.
Engine component imbalance See Procedure B, page 5.
CAUTION: Determine if vibration is characteristic of engine type before beginning repair for imbalance. If normal, do not attempt to repair.
TABLE B
-
FRONT END VIBRATION
Possible Cause
Repair
1 .
Tire/wheel imbalance
See Procedure C, page 7.
2.
Tire/wheel run-out
See Procedure D, page 7.
3.
Steering and suspension
See Procedure E, page 10.
4.
Wheel alignment
Use normal procedures.
5.
Tire non-uniformity
Replace tire.
TABLE C
-
REAR TIRE/WHEEL VIBRATION
Possible Cause
Repair
1.
Tire/wheel imbalance
See Procedure C, page 7.
2.
Tire/wheel run-out
See Procedure D, page 7.
3.
Tire non-uniformity
Replace tire.
TABLE D
-
DRIVELINE VIBRATION
Possible Cause
Repair
1.
Driveshaft/differential phase match
See Procedure F, page 10.
2.
Universal joints
See Procedure G, page 11.
3.
Driveshaft run-out
See Procedure H, page 11.
4.
Driveshaft imbalance
See Procedure I, page 13.
5.
Companion flange run-out
See Procedure H, page 11.
6'.
T/M extension hsg. bushing
Check bushing for wear.
7.
Center support bearing
Check bearing for wear.
8.
Sleeve yoke spline
Check spline for sticking.
9.
Ring and pinion run-out
See Procedure J, page 16.
10.
Axle shaft/hub run-out
See Procedure K, page 17.
Before beginning repairs of engine-related vibration, ensure proper engine condition and operation by thorough analysis. Additionally, confirm that
vibration is not characteristic of the particular engine type by inspecting other similar vehicles. If condition is normal, do not attempt to repair it.
Procedure A - Engine Accessories, Belts, Pulleys
1.
After confirming vibration RPM and proper engine tune, stop engine.
2.
Carefully inspect engine accessory drive belts and pulleys for damage, misalignment, and wear. Correct as necessary.
