General Engine Diagnosis Part 1, Exams of Advanced Education

Download General Engine Diagnosis Part 1 and more Exams Advanced Education in PDF only on Docsity! General Engine Diagnosis Part 1 Black smoke This is an indicator of an air fuel mixture that is too rich. Causes of black smoke -leaking fuel pressure regulator diaphragm. -defective fuel injector. -electronic sensor misleading computer, adding more fuel than needed. his is an indicator that coolant is leaking into one or more cylinders and the engine is trying to burn the coolant. Super over heat the coolant into a very fine vapor. The convertor could do this and causes the internal coolant leak to be hid until it is very sever. Blown head gasket The most common cause of white smoke cause of oil leaks bad gaskets and seals. PCV Valve What should always be checked for good operation to prevent oil leaks. Verify the customer complaint What is the first step to working on vehicle. half pint of fuel in 30 seconds A good running motor will produce this within the fuel system crank to easily the timing belt or chain may have broken or jumped time. before road test you should always visually inspect the vehicle for fuel/oil/coolant leaks, loose/cracked/glazed/frayed belts pressure testing the cooling system watch the gauge needle for an indication of a leak. spark plug doesnt fire If this happens you should disconnect the coil wire from the cap and use a spark test. secondary circuit The distributor, cap, rotor, wires, plug of the ignition system primary circuit The module and coil of the ignition system pressure The fuel system is always under ______. (on fuel injection systems, even when turned off) o-ring a leak from a fitting that is tight, may be from a damaged ______. fresh air what must be able to enter the crank-case. idle at _____ a substantial amount of air enters the PCV valve. inlet you should feel a strong pressureif you pull the PCV valve out of its grommet with the engine idling, you should feel a strong suction at the valves _____. Bearing noises what is caused by too much clearance between parts or loss of oil pressure crankshaft noises -main bearings -connecting rod bearings -pistons -wrist pin -crankshaft end-play valvetrain noises -bearings -rocker arms, shaft, ball and seat -pushrods -tappets and camshaft -timing gears and chain other engine noises -loose or broken brackets -belt squeaking -spark knock - exhaust leak Main bearing noise caused by too much bearing clearance, which usually create a deep metallic knocking. When you increase rpm or engine load, the knocking usually increases in frequency. crankshaft end play noise deep knocking most obvious at idle, diminishes when a load is put on the crank shaft. Or if the clutch is disengaged on a manual vehicle. tip of craknshaft you can verify if excessive crankshaft end play by fitting a dial indicator to the ______ piston noises dull or muffled metallic rattle piston pin noises light but sharp metallic rapping at idle. hydraulic lifter noise consistent ticking that occurs at a frequency slower than the engine rpm spark knock uncontrolled combustion, sounds like a metallic ringing noise. white smoke Any leak from the cooling system into the intake or combustion areas can cause ____