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2.1.2. Reduction of the piston of the first cylinder in the provision of the top dead point (TDP)

Implementation of the procedure described below is based on the assumption that the ignition distributor (if it is available) is installed correctly. If you try to bring the piston into the provision of VMT in order that it is correct to install the distributor, then position of the piston has to be determined by presence of pressure in an opening for a spark plug No. 1 then it is necessary to combine tags of ignition or to insert the device for installation of the moment of ignition in a flywheel, depending on model.


The cylinder No. 1 is a cylinder, the next to a radiator.

The top dead point is called extreme top position of the piston in its course up and down in the cylinder at rotation of a bent shaft. Each piston reaches VMT as at the end of a compression step, and a release step, but to usually take to consider for engine VMT the top position of the piston at the end of a compression step.

Installation in the provision of VMT is an integral part of many procedures, such as removal of a distributive belt or a chain and removal of the distributor of ignition.

Before the procedure make sure that transmission is established in neutral situation and cock the parking brake or block back wheels. Besides, disconnect system of ignition, having disconnected a coil wire from the central plug of a cover of the distributor and having grounded it on the block of cylinders by means of a wire. Remove spark plugs (see the Head Routine maintenance of the car).

 PERFORMANCE ORDER

  1. To bring any piston into the provision of VMT, it is necessary to turn a bent shaft, using one of the ways described below. If to look at the engine in front, the normal direction of rotation of the crankshaft - clockwise.
  2. The most preferable way of a provorachivaniye of the crankshaft - by means of the replaceable head and the ratchet mechanism attached to the bolt twisted in a forward part of the crankshaft.
  3. It is also possible to use the remote switch of a starter that will help to save a little time. Follow the instructions attached to the switch. After the piston as much as possible will approach the provision of VMT, use a replaceable head and a ratchet as it is described above.
  4. If you have an assistant who can put the ignition lock in situation "Start" short breakthroughs, then you can bring closer the piston to the provision of VMT and without remote switch of a starter. After your assistant will go out of the car, finish the procedure by means of a replaceable head and a ratchet as it is described in the and point.
  5. Notice position of the plug on a distributor cover for a wire of a spark plug No. 1. If the plug is not marked, track a wire from a cylinder No. 1 candle to a cover (the cylinder No. 1 - the next to a radiator).
  6. Put with a felt-tip pen or chalk a tag directly under the plug No. 1 on the case of the distributor or on a cover of gear wheels.
  7. Uncover the distributor and put it aside (if necessary see the Head Routine maintenance of the car).
  8. Turn a bent shaft so that distributive tags (on a forward part of the engine) coincided. On the M40 engine there are no distributive tags in a forward part, instead on it there is a distributive opening in a flywheel which should be combined with an opening in a back flange of the block of cylinders. For this engine, turn a bent shaft until the runner of the distributor does not approach the provision of VMT, and then continue a provorachivaniye until the drill suitable on diameter is able to enter at the same time openings in the block of cylinders and in a flywheel.
  1. Look at the distributor runner - he has to point directly to the tag applied with you on the case of the distributor or on a cover of gear wheels.
  1. If the runner specifies in opposite on 180 ° the direction, so the piston No. 1 is in VMT, but in a release step.
  2. To bring the piston into compression step VMT, turn a bent shaft on one whole revolution (360 °) clockwise. Now the runner has to indicate a tag on the distributor or a cover of gear wheels. When the runner indicates the plug of a wire of a spark plug No. 1 on a distributor cover, and tags of distribution of ignition are combined, the piston No. 1 is in the provision of VMT of a step of compression.

If it is impossible to combine ignition tags when the runner indicates a tag, then it is possible that the distributive belt or a chain slipped several teeths on an asterisk, or were established incorrectly.

  1. After the piston No. 1 is given to the provision of VMT of the end of a step of compression, VMT for other pistons can be reached by a provorachivaniye of a bent shaft in accordance with the established procedure of operation of cylinders. Notice position of plugs of wires of other spark plugs also as you did it for the plug No. 1, then number tags according to numbers of cylinders. At a provorachivaniye of a bent shaft the runner will also turn. When he directly points to one of tags on the distributor, the piston of this cylinder will fall into a compression step VMT state.