![]() The image shows a stainless steel BBQ skewer). The protractor is placed on the crank and a pointer (made from wire or wire rod) is placed at the desired angle. While turning the outer circumference of the cage in that position to set the pointer tip to "0", check with the small needle gauge that the measuring plunger of the gauge has been pushed about 2 to 3 mm.Īn engine protractor is necessary to find the position of the upper dead centre more clearly. Turn the outer circumference of the gauge at upper dead center to set "0".Īfter setting the gauge, tighten and fix it firmly, turn the crankshaft slowly and the upper dead centre is the position where the dial gauge stops on the right-hand side (1.00 mm per revolution of the gauge, i.e. It is advisable to remove the spark plug, insert the long thin screwdriver tip into the plug hole, slowly rotate the crankshaft forward, stop the crank just before the screwdriver is pushed up the most, and set up the gauge for checking the top dead center. This is where an engine protractor or engine timer comes in handy. When tuning an engine, it is often necessary to measure the position of the pistons with a dial gauge to reconfirm the "top dead center" position before adjusting the ignition timing or measuring the valve timing. In the case of engines installed in commercial vehicles, the piston is considered to be at top dead center when the markings on the side and circumference of the flywheel and magnet rotor match the markings on the fixed side of the engine (crankcase, engine cover, etc.). 12 degrees) before the top dead center (TDC = Top Dead Center). The numerical data of the ignition timing is often displayed as "◎ degree" (e.g. If it's a 4-stroke engine, it's marked "◎ degrees before top dead center. Adjusting the gap and position of the sensor is also important.Use the timing light to check the ignition timing.Confirmation of upper dead point of Kawasaki H2, specific example.Turn the outer circumference of the gauge at upper dead center to set "0". ![]() 2-stroke engines marked "◎mm before top dead center".If it's a 4-stroke engine, it's marked "◎ degrees before top dead center.
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