TDC
TDC
| Top Dead Center (TDC) for number one piston relocating
1. TDC is the highest point in the cylinder that each piston reaches as it travels up the cylinder bore. Each piston reaches TDC in the compression stroke and again on the exhaust stroke, but TDC generally refers to the piston position on the compression stroke. The timing marks are referenced to the number one piston at TDC on the compression stroke. 2.Positioning the pistons at TDC is an essential part of many procedures such as cam shaft removal, timing chain replacement and distributor removal. 3. In order to bring any piston to TDC, the crankshaft must be tuned using one of the methods outlined below. When looking at the front of the engine, normal crankshaft rotation is clockwise. The preferred method is to turn the crankshaft with a large socket and breaker bar attached to the large bolt that is threaded into the front of the crankshaft. 4. Scribe or paint a small mark on the distributor body directly below the number one spark plug wire terminal in the distributor cap. 5. Remove the distributor cap. 6. Turn the crankshaft until the line on the vibration damper is aligned with the zero or "TDC" mark on the timing indicator. 7. Rotor should be now be pointed directly at the mark on the distributor. If it is 180 degrees off, the piston is at TDC on the exhaust stroke. 8. If the rotor is 180-degrees off, turn the crankshaft one complete turn (360-degrees) clockwise. The rotor should now be pointing at the mark. When the rotor is pointing at the number-one spark plug wire terminal in the distributor cap (which is indicated by the mark on the distributor body) and the timing marks are aligned, the number one piston is at TDC on the compression stroke. 9. After the number one piston has been positioned at TDC on the compression stroke, TDC for any of the remaining cylinders can be located by rotating the engine in the normal direction of rotation until the rotor is pointing to the spark plug wire terminal in the distributor cap for the piston you wish to bring to TDC. LINKS http://www.howstuffworks.com/camshaft.htm
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