38 A wet compression test is performed on an engine after a dry compression test

38.A wet compression test is performed on an engine after a dry compression test revealed low compression on one cylinder. If the compression on the low cylinder rises, it indicates __________? A.Leaking valves B.Worn rings C.Worn camshaft D.All answers are correct

39.Give some examples of abnormal engine noises, including a description of the sound, and their likely causes below. TypeSoundMostly Heard DuringPossible Causes Ring noiseClicking orHigh pitched rattle Acceleration Broken or wornpiston rings Worn cylinder walls. Piston slap Bell-likeEngine is coldWornpistons, Worn cylinder walls Collapsed piston skirts Assessment 1 – Questioning – Written Assessment – AURLTE004 Version: 1.0Created:Feb 2017 Page 12 of 23

AURLTE004 Diagnose complex faults in light vehicle petrol engines Piston pinknockMetallic rap andSharp Hot engine operation Worn Piston pin bushing Lack of oil. Main bearingnoiseSteady knock andDull Louder duringaccelerationWorn bearings Worn crankshaft Rod bearingnoise Pounding Idle speeds and low load higher speedsWorn bearings Lack of lubrication Worn crankshaft ThrustbearingnoiseHeavy thumpingIrregular sounds maybe heard duringacceleration Worn bearings Worn engine saddles Worn crankshaft Tappet noiseLight regular clickingHeard during Idle Improper valve adjustment Dirty hydraulic filters Lack of lubrication Timing chain noise Severe knockingIncrease with enginespeed Loose timing chain 40.Engine oil pressure testing should be tested with the engine cold?

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Assessment 1 – Questioning – Written Assessment – AURLTE004 Version: 1.0Created:Feb 2017 Page 13 of 23

AURLTE004 Diagnose complex faults in light vehicle petrol engines 41.An oil pressure test is used to determine the wear of an engine’s parts.

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42.Complete the following statement about oil pressure testing using the following words. An oil __ Pressure ____ tester is a gauge with a _ High-pressure ____ hose attached to it. The scale of the ___ Gauge _____ typically reads from 0 to 100 __psi________ (0 to 690 ___kPa_______). Using the correct fittings and __ Adapters _____, the hose is connected to an___oil_______ passage in the __engine_____ block. The ___test_____ normally includes the following steps: 1Remove the oil pressure __ Sensor ___ and tighten the threaded end of the gauge’s ___ Hose __ into that bore. 2__Run____ the engine until it reaches normal __ Operating ____temperature. 3Observe the gauge ___ Reading ___ while the engine is __ running ___ at about 1,000 rpm and at 2,500 rpm (or the specified engine speed). 4Compare the readings to the __ Manufacturer’s ________ specifications. Excessive bearing _ Clearances ____ are not the only possible causes for __low________ oil pressure readings; others are oil pump-related __problems___ a plugged oil pickup ___screen_______, weak or broken oil pressure __relief________ valve, low oil level, __contaminated________ oil, or low oil viscosity. Higher than normal readings can be caused by too ___much_______ oil, cold oil, high oil __viscosity________, restricted oil passages, and a ___faulty_______ pressure regulator.