1.1.8 Black smoke coming out of engine exhaust 1.1.9 Low oil pressure 1.1.10 Abnormal engine noise 11 Check Causes Remedies Air filter An air filter component is clogged. Clean or replace the air filter component Fuel injector The opening pressure of fuel injector is too low. Atomizing is bad. Adjust or replace the fuel injector Fuel injection timing Fuel injection timing is not correct. Adjust the fuel injection timing Injection pump The damage of delivery valve results in fuel dripping after injection. Replace the delivery valve The injection volume is too high. Reduce injection volume Check Causes Remedies Engine oil The oil viscosity is not correct. The oil volume is too low.
Replace the engine oil Increase the oil volume Oil pressure gauge or assembly Oil pressure indicator light The oil pressure gauge or assembly is broken. The indicator light is broken. Repair or replace the oil pressure gauge or assembly Replace the indicator light Oil filter An oil filter component is clogged. Replace the oil filter component or the filter element Safety valve and bypass valve The safety valve is jammed and/or the bypass valve spring is too soft. Replace the safety valve and/or bypass valve spring Oil pump The oil pump strainer is blocked. Clean the oil pump strainer A component in the oil pump is worn. Replace relevant parts in the oil pump.
Rocker shaft The rocker shaft bearing is worn. Replace the rocker shaft bearing Camshaft The camshaft and its bearing are worn. Replace the camshaft and its bearing Crankshaft and bearing The crankshaft and its bearing are worn. Replace the crankshaft and/or its bearing 1. Engine slap Verify the engine is completely warmed up before troubleshooting. Check Causes Remedies Fuel The fuel is not correct. Replace the fuel Fuel injection timing Fuel injection timing is not proper. Adjust the fuel injection timing Fuel injector The opening pressure of fuel injector or atomizing is not proper. Adjust or replace the fuel injector