What is the compression ratio of this engine? - 10.5:1 Divide Max Pressure by 20 = 210÷20=10.5, What is technician checking here? - Piston ring end gap., Why is bore measured in two places? - Checking ovality of bore, What is being measured in this image? - Piston protrusion, this can affect timing, cause cylinder head damage., What is name of tool shown? - Bore Gauge (AKA Mercer Gauge), What is this tool used for? - Measure cylinder bores, Ovality Taper & Wear, Which set of figures would you expect with a CR of 10.5:1? - B 140 (rounded), 170 (rounded), 210 MP., What test is being carried out? - Cylinder leakage, Twin gauges., What test tool is being used? - Compression gauge, single gauge High pressure, What use would these tools have? - Timing pins, lock Cam, Crank and Fuel pump, when changing timing belt., What is being checked in image? - Ignition coil for continuity, LT primary windings, HT secondary windings., Your OBD scan gave this result, where is fault likely to be? - P is Powertrain, 0 is ISO/SAE code, 3 is affected sub-system (Ignition), 02 is Specific code (cylinder 2) , What test is being conducted in image? - Cylinder head distortion, if out of tolerance combustion can enter water system., What are you looking for when you measure bore at three heights? - Taper, when cold lower part of cylinder may be slightly larger to allow heat expansion., Why must cylinder head bolts be undone - and refitted - in a specific order? - To prevent warping, the cylinder head can be made of lighter material than block., Why must you depressurise fuel system before carrying out compression test? - Neat fuel can wash precious metals from Catalyst, also there is a fire risk., When carrying out a cylinder leak test, air is escaping at Exhaust pipe what is likely fault? - Exhaust valve not seating., When carrying out a cylinder leak test, air is escaping at Intake pipe what is likely fault? - Inlet valve not seating correctly., When carrying out a cylinder leak test, air bubbles are in coolant what is likely fault? - Head gasket or cracked block., When carrying out a cylinder leak test, air is escaping from oil breather what is likely fault? - Piston Rings are worn., When completing a wet compression test, the result increased 20 P.S.I. where is fault likely? - Piston rings, as oil seal rings, improving reading., When completing a wet compression test, there is no improvement in results, what is likely fault? - Valves burnt out, oil cannot seal a valve., Name one test that can carried out with this tool? - End Float, Run out, Bow, Lift., Name this measuring tool? - Dial Test Indicator (DTi), What is the travel between TDC and BDC called? - Stroke. or swept Volume., If swept volume is 90mm and clearance volume is 10mm what is Compression ratio? - 90+10=100. 100 ÷ 10 = 10, so 10:1, What is purpose of item in image? - This is a thermostat, it aids engine warming up., What is item shown in image? - ECT coolant temperature sensor., How can item shown be tested? - Test continuity, warm ECT and resistance should drop., What is purpose of item shown? - Core plug designed to fail if engine freezes., Where is this part located? - In sump attached to oil pump, it is a strainer., What is being carried out in image? - Cylinder head distortion, using a straight edge & feelers., What is likely fault in image? - Valve damage, not seating engine misfire, or failure,, What is component in image? - Catalytic converter?, What does this item do? - Turbo charger it Increase volumetric efficiency, Why are there two Oxygen sensors fitted one pre-catalyst, and one post-catalyst? - The post catalyst sensor is a control, if both read same then Catalyst no longer working.,

Engines Level 3

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