Note: the sequence of operations is described assuming that the ignition distributor is installed correctly. If you want to determine the TDC for installing the distributor, set the piston of the first cylinder to TDC, then set the ignition marks according to item 8.
1. The piston reaches TDC at the end of the compression and exhaust strokes, but here we will always talk only about compression TDC.
2. The exact position of the piston at TDC is extremely important when performing many jobs, for example, when removing the camshaft, rocker arm, drive belt and camshaft gear, ignition distributor.
3. Before starting work on installing TDC, make sure that the gearshift lever is in neutral, in addition, it is necessary to ensure that the car is braked by any means. Disconnect the ignition system by removing the central wire from the distributor cap and grounding it to ground with a wire. Remove the spark plugs (see Chapter 1).
4. To set any of the pistons to TDC, rotate the crankshaft using one of the methods described below. The correct rotation of the engine shaft is clockwise (view of the camshaft drive belt), so:
a) the most preferred method is to rotate the crankshaft through one of the drive wheels, which must be jacked up.
b) to save some time, you can use a remote starter (see the corresponding instructions) to bring the piston to TDC, the precise setting of TDC is carried out by turning the crankshaft through the wheel.
5. Find the marking of the spark plug breaker of the first cylinder on the distributor cap. If it is not marked, find it by the spark plug wire.
6. Make a mark on the distributor housing opposite the breaker terminal.
Fig. 3.6 Make a mark (arrow) on the distributor housing opposite the high-voltage wire socket of the first cylinder spark plug
7. Remove the distributor cap (see Chapter 1) and take it aside.
8. Turn the crankshaft so that the TDC mark on the timing belt pulley is opposite the mark on the engine cover. On most engines, the TDC mark is highlighted in white paint and is always separate from the degree marks for setting the ignition timing.
9. The rotor (runner*) of the distributor should be located exactly opposite the mark on the housing that you made. If so, then go to step 12.
Fig. 3.9 Together with the coincidence of the degree marks, the distributor slider should point to the mark that you made on the distributor housing (arrow)
10. If the rotor is located at 180°, then the piston of the first cylinder is at TDC of the exhaust stroke.
11. To set the TDC of the compression stroke, rotate the engine crankshaft 360° counterclockwise. The rotor should reach the position opposite the mark.
12. The TDC of the remaining cylinders is determined according to the operating order and is set by rotating the engine clockwise. Lock the position of the high-voltage wire terminals on the cover relative to the housing. When the engine rotates, the rotor, located according to the mark on the housing, will show that the corresponding piston is at TDC of the compression stroke.
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