COUPLER AR- 3967253 - Caterpillar

ENGINE DISASSEMBLY
External Condition
Check the external (outside) condition of the engine. Make a note of any missing or damaged parts.
Intake and Exhaust Manifolds
Remove and check the manifolds for cracks, excessive soot or dirt deposits, oil or water deposits, and other foreign objects.
Air Cleaner
Check the condition of the seals on the elements and the elements themselves. Check to make sure the fittings and air lines that are connected to the air cleaner, filter indicator, air compressor, etc. are tight.
Turbochargers
Check for excessive axial or radial clearance of the rotor assembly, damage to the impeller or turbine, and worn or scratched bearings.
Fuel Lines And Injection Nozzles
1. Check the torque on the fuel line nuts and the condition of the taper on the ends of the lines. Do the tapers make a good seat?2. Check the fuel leak detection system (if so equipped).3. Check the torque on the fuel injection nozzle nuts and the clearance between the nozzle and the adapter. Make a note of the position of the nozzles.4. Test the nozzles according to the procedure in the Service Manual or Special Instruction, Form SEHS7292.Engine Timing
1. If the crankshaft can be turned, check to see if the fuel injection pump and the camshaft are in correct time with the crankshaft by pin timing before the engine is disassembled. If either one or both are not in correct time, find out how far they are out of time. Check the tightness of the bolts that hold the drive gear to the camshaft.2. If the crankshaft can not be turned, check the tightness of the bolts for the camshaft drive gear. Remove the complete fuel pump and check the "Off Engine" timing.Fuel Injection Pump
1. Check the fuel setting, timing, delivery and timing advance (if part of the fuel injection pump) for the fuel system.2. If fuel is present in the oil, pressurize the fuel pump housing to approximately 345 kPa (50 psi) and check for leaks. If no leaks are found, raise the temperature of the fuel pump housing to 80° - 90°C (176° - 194°F) and test again.Intake and Exhaust Valve Mechanisms
1. Make a record of the condition of the components. Are there broken rocker arms, seized cams, rollers, etc? Mark the position of these components in the engine. If a rocker arm is broken, check the position of the valve adjustment screw. Make an estimate of whether the valve clearance was correct.2. Check the operation of the valve mechanism components.3. Look for signs of gas blow-by through the valve guides.Camshaft Housing (if so equipped)
Remove and make note of the location of the camshaft and the camshaft housing on the engine.
Cylinder Head Bolts
Check to see if the cylinder head bolts have the correct torque.
Cylinder Head
1. Disassemble the cylinder head completely. Check for wear of valve stems and guides. Look for signs of sticking broken, grooved, or burned valves. Are the amounts of deposits on the stems, valve seats, and valve heads normal? Check for cracks around the precombustion chambers on the direct injection