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Installing the cylinder head
In commercially available cylinder head gaskets, which have different thicknesses. The thickness of the cylinder head gasket is dependent on how the pistons protrude above the surface of the cylinder. If you change only the cylinder head or set back the old cylinder head with a new gasket, the new gasket can buy, look at how much has notches or holes from the pads. In addition, you can see the number of spare parts of old gasket. If replacement of pistons, parts of the crank mechanism or a cylinder, it is necessary to re-measure the distance that the pistons protrude above the cylinder head.
| Fig. 409. Measuring the distance that the pistons act to determine the thickness of the cylinder head gasket
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In order to determine the thickness of the cylinder head gasket need to put one of the pistons to TDC, and using a ruler and an indicator to determine how the piston crown above the surface of the cylinder (see. Fig. 409). By measuring the distance and using the information below, determine the thickness of the cylinder head gasket.
| Fig. 408. type cylinder head gasket
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Cylinder head gasket labeled with numbers 1, 2 or 3, or denotes holes (Fig. 408). The arrow indicates the number of spare parts in the cylinder head gasket. If the cylinder head gasket is installed correctly, this number can be read by looking at the cylinder head gasket on top. Number of projection pistons cuts 0,91-1,00 mm 1 1,01-1,10 mm 2 1,11-1,20 mm 3 As already mentioned, the cylinder head gasket may be labeled by means of punched holes. In this case, you should not read "the number of notches," and "the number of holes." To carry out the measurement, set the indicator pin on the piston, put the value of the measuring device to zero, and then slide the pin on carefully cleaned the surface of the unit. The resulting value is equal to the distance by which the plunger extends from the cylinder head. Depth is poorly measured, because it is very small. Number pad should be determined through the spare parts.
| Fig. 410. In the shown locations on the engine block must be screwed in two special screws (or two rods). The guide sleeve (arrow) must be pressed into the cylinder side
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There are special guide pins that serve to align the head of the cylinder when mounted on the engine block. If you buy them in the set shown in the figure. 410 location, i.e. at the "cold" side of the engine. Otherwise it is necessary to make the set screws to be screwed into said space in order to properly align the gasket and the cylinder head. The figure also shows a guide sleeve, which must be located in the unit. Thoroughly clean the surface of the cylinder head and aggregates. The gasket must be removed from the packaging directly before the installation and it is necessary to treat it very carefully. Place the gasket on the cylinder head and fit the cylinder head to the engine block. Put the cylinder head on the two guide screws (see. Fig. 410), set the guide sleeve and it Tap the plastic or rubber hammer. Insert the bolts of the cylinder head and tighten them by hand. Remove the two screws from the guide cylinder.
| Fig. 411. The procedure for tightening the cylinder head bolts
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Guided Fig. 411, gradually tighten the bolts of the cylinder head in a specified sequence and in accordance with further recommendations:
A warning To tighten bolts of the cylinder head, use only special 12-sided key, as would otherwise be damaged bolt heads. |
- Tighten all screws (see. Fig. 411) in the specified sequence to 40 N ?� m; - Tighten all screws (see. Fig. 411) in the specified sequence to 60 N ?� m; - In the specified sequence, insert the key into every bolt, noting the position of the capstan and tighten each bolt in a single approach is precisely a quarter turn without using a torque wrench. Once you have done all the bolts and tighten them another quarter turn.
Note If you are familiar with earlier models of diesel engines, you probably know that before the bolts tightened cylinder head on the engine warm up to its operating temperature. It is no more - the cylinder head is tightened in accordance with the instructions. |
All further work on the installation in the reverse order with respect to the process of removing (Sec. 17.3.1).
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