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Symptoms - Engine Mechanical > < Upper Engine Noise, Regardless of Engine Speed

Astra J

Lower Engine Noise, Regardless of Engine Speed



Cause
Correction

Low oil pressure
•  Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .
•  Repair or replace damaged components as required.


Worn accessory drive components- abnormalities, such as severe cracking, bumps, or missing areas in the accessory drive belt and/or misalignment of system components
1. Inspect the accessory drive system.
2. Repair or replace as required.


Loose or damaged crankshaft balancer
1. Inspect the crankshaft balancer.
2. Repair or replace as required.


Detonation or spark knock
Verify the correct operation of the ignition system. Refer to Symptoms - Engine Controls .

Loose torque converter bolts
1. Inspect the torque converter bolts and flywheel.
2. Repair or replace as required.


Loose or damaged flywheel
Repair or replace the flywheel.

Damaged oil pan, contacting the oil pump screen

An oil pan that has been damaged, may improperly position the oil pump screen, preventing proper oil flow to the oil pump.
1. Inspect the oil pan.
2. Inspect the oil pump screen.
3. Repair or replace as required.


Oil pump screen loose, damaged or restricted
1. Inspect the oil pump screen.
2. Repair or replace as required.


Excessive piston-to-cylinder bore clearance
1. Inspect the piston and cylinder bore.
2. Repair as required.


Excessive piston pin-to-bore clearance
1. Inspect the piston, piston pin, and the connecting rod.
2. Repair or replace as required.


Excessive connecting rod bearing clearance
Inspect the following components and repair as required:

•  The connecting rod bearings
•  The connecting rods
•  The crankshaft
•  The crankshaft journals


Excessive crankshaft bearing clearance
Inspect the following components and repair as required:

•  The crankshaft bearings
•  The crankshaft journals


Incorrect piston, piston pin, and connecting rod installation

Pistons must be installed with the mark, or dimple, on the top of the piston, facing the front of the engine. Piston pins must be centered in the connecting rod pin bore.
1. Verify the pistons, piston pins and connecting rods are installed correctly.
2. Repair as required.

 

Symptoms - Engine Mechanical > < Upper Engine Noise, Regardless of Engine Speed