0320490 JOHNSON SPRING,Pawl to cam follower

Recommended Repairs
Excessive Load
Ensure that the engine is not operating under an excessive load. Excessive load can be caused by any of the following conditions:
High altitude operation
Low tire pressure
Parasitic loadsPoor Fuel Quality
Ensure that there is good, clean fuel in the tank. When possible, interview the operator in order to determine if fuel quality is in question. Refer to Troubleshooting, "Fuel Quality".Plugged Fuel Filter or Plugged Air Filter
Inspect the air filter. Replace the air filter, if necessary. Check the water separator (if equipped). If the fuel filter has not been replaced recently, replace the fuel filter.Excessive Engine Oil
Check the engine oil level. If the engine oil level is high, drain the oil. Refill the system to the correct level. Determine the source of the extra oil. If the oil is diluted with fuel, locate the fuel leak and repair the fuel leak. Refer to Troubleshooting, "Fuel In Engine Oil".High Fuel Temperature
Verify that the temperature of the fuel in the fuel tank is less than 78 °C (172°F). A low fuel level in the fuel tank can cause high fuel temperature. Check for proper operation of the fuel heater, if equipped.Air Inlet Leak After the Turbocharger
Check for loose connections between the turbocharger and the inlet manifold. A small air leak can cause problems when the engine is operating under full load. Check the aftercooler for visible signs of leaking. A soap solution can be used to detect leaks. Allow the engine to cool before the soap solution is used.Exhaust Leak Before the Turbocharger
Exhaust leaks between the exhaust manifold and the turbocharger can reduce boost pressure. Check for exhaust leaks at the exhaust manifold. Also check for exhaust leaks at the mounting flange for the turbocharger.Air Inlet Restriction or Exhaust Restriction
Measure the air inlet restriction and measure the exhaust system restriction. Refer to Systems Operation, Testing And Adjusting. Measure the air inlet restriction at the inlet of the turbocharger. The maximum inlet restriction is 6.2 kPa (25 inches of H2O). Measure the exhaust restriction after the turbocharger. The maximum exhaust restriction is 10 kPa (40 inches of H2O). Refer to Technical Marketing Information (TMI) for additional data.High Air Inlet Temperature
Check for proper operation of the air inlet heater (if equipped). Measure the inlet air temperature. Compare the inlet air temperature to the specification for the inlet air temperature that is listed in the TMI. If the inlet air temperature is high, check the aftercooler for restrictions and also check the aftercooler for proper operation.Fuel Ratio Control Setting
The fuel ratio control uses oil pressure to restrict the rate of rack movement. When the engine is stopped, the fuel ratio control will extend to the full fuel position for easier starts. The fuel ratio control adjustment can be found in Systems Operation, Testing and Adjusting, "3406C Diesel Truck Engine". Faulty Valve Train
Remove the valve cover. Inspect the following items for damage:
Push rods
Rocker armsRefer to Disassembly and Assembly, "3406C Truck Engine".Improper Fuel Injection Timing
Check the fuel injection timing. Refer to Systems Operation, Testing And Adjusting, "3406C Diesel Truck Engine".Incorrect Fuel Setting
Check the fuel setting. Refer to Systems Operation, Testing And Adjusting, "3406C Diesel Truck Engine".Faulty Turbocharger
Inspect the turbocharger compressor wheel. If excessive deposits are found on the compressor wheel or the compressor wheel is damaged, determine the cause. If the cause is not found, the problem will reoccur. Rotate the compressor wheel in order to check for dragging or binding. Check for excessive play in bearings.Low Fuel Pressure
Ensure that the vent for the fuel tank is not plugged. Check the fuel pressure. Refer to Systems Operation, Testing And Adjusting, "3406C Diesel Truck Engine". Minimum fuel pressure with clean fuel filters is 70 kPa (10 psi) at low idle or 170 kPa (25 psi) at high idle. If the fuel pressure is low, make sure that the fuel filters are not plugged. Premature plugging of the fuel filter indicates excessive fuel system contamination. Ensure that the fuel system is clean.Air in the Fuel
Refer to Troubleshooting, "Air In Fuel".Faulty Fuel Injector Nozzle
Faulty fuel injection nozzles will normally cause the engine to misfire which will cause the engine to run rough. Faulty fuel injection nozzles can also cause too much smoke even if the engine is running smoothly. Remove the fuel injection nozzles and check the fuel injection nozzles. Refer to Special Instruction, SEHS7292. Refer to .Low Cylinder Compression
Check for signs of broken piston rings, faulty cylinder head gasket, and worn cylinders or valves. If the engine runs properly and there is not excessive blowby or excessive oil consumption, the cylinder compression is probably acceptable.