VALVE AS-DRAIN 3953437 - Caterpillar

Probable Causes
Diagnostic codes
Air intake and exhaust system
Air inlet heater starting aid (if equipped)
Glow plugs (if equipped)
Valve lash
Fuel supply
Low compression (cylinder pressure)
Fuel injectorsRecommended Actions
Diagnostic Codes
Check for active diagnostic codes on the electronic service tool. Troubleshoot any active codes before continuing with this procedure.Visual Checks
Visually inspect the engine for the following faults:
Missing components
Damaged components
Oil leaks
Coolant leaks
Fuel leaks
Hydraulic leaks
Check electrical cables for damage. Check that the electrical cables are properly secured.
Check for the proper level of fuel, oil, coolant, and hydraulic fluids
Try to start the engine. If the engine does not start, verify that the crankshaft is rotating. Use a suitable hand tool in order to rotate the crankshaft.
If the crankshaft does not rotate freely, check the engine for the following problems:
Seized piston
Defects in the drive gears
Fluid in the cylinder bores
Improper timing of valvesAir Intake and Exhaust System
Check the air filter restriction indicator, if equipped.
Ensure that the air filter is clean and serviceable.
Check the air intake and exhaust systems for the following defects:
Blockages
Restrictions
Damage to lines or hoses
Repair any defects before attempting to restart the engine.
If