Top dead end of cylinder #1

General information

1. Top Dead Center (TDC) - the highest point in the cylinder, which the piston reaches during its translational movement during the rotation of the crankshaft. Each piston reaches TDC at the end of the compression stroke and at the end of the exhaust stroke. It is generally accepted that TDC corresponds to the position of the piston (usually #1 cylinder) in the compression stroke. When carrying out some procedures, a prerequisite is the position of the engine corresponding to TDC. The marks on the vibration damper, mounted on the crankshaft in front, are associated with the position of cylinder No. 1 at TDC.

2. Cylinder No. 1 is located on the right side of the engine, in the rear section of the block. Cylinders #2 and #3 are in the same section. Cylinder No. 4 is located on the right side of the engine, in the front section of the block.

3. Remove all spark plugs (Chapter 1). To improve access to the crankshaft pulley, remove the front wheel and wheel housing poker.

4. It is best to turn the crankshaft with a key on its pulley bolt. It can also be turned with a starter (when an assistant turns the ignition key or using the remote starter switch) to a position close to TDC, and then tighten manually with a key. After using the starter, it must be immediately disconnected.

5. Turn the crankshaft clockwise to feel compression in cylinder #1, temporarily plugging the spark plug hole.

6. Rotate the shaft in the same direction so that its pulley key is in the 11 o'clock position. The timing mark on the periphery of the pulley must match the mark (in the form of an arrow) on the cover of the gas distribution mechanism. Nearby are arrows corresponding to the position of the piston before TDC by 10°and 30° (see Fig.4.6, a,b).




7. If additional inspection is required, you can remove the block head covers (paragraph 6) and check the position of the marks on the camshaft sprockets. These marks should be facing each other when cylinder #1 is at TDC (see fig. 4.7).



8. After setting the piston of cylinder No. 1 to TDC, you can set the TDC in other cylinders by turning the crankshaft 120° (at once) and monitoring the order of operation of the cylinders (see Technical Requirements).