Removal of a head of the block of cylinders carry out on the cold engine in the following order:
– dump pressure in fuel system;
– switch off ignition and disconnect a "weight" wire from the storage battery;
– merge cooling liquid;
– remove a belt of a drive of hinged units;
– remove the generator;
– uncover heads of the block of cylinders;
– remove throttle knot, nozzles and the distributive fuel highway;
– remove an inlet collector;
– remove a final collector;
– remove a chain and asterisks from camshafts;
– remove camshafts and pushers;
Fig. 3.54. An arrangement of the regulating oil valve (OCV) in a back part of a head of the block of cylinders
– remove regulating oil valve (OCV) (see
Fig. 3.79. Places of connection of components to a head of the block of cylinders from the driver: 1–hoses of system of cooling; 2–suppressor of a radio noise; 3–"mass" wire; 4–sensor of provision of a camshaft; 5–electric socket of the sensor of oxygen; 6–the sensor of temperature of cooling liquid; 7–sensor of pressure of oil
– mark and disconnect from a head of the block of cylinders hoses of system of cooling both all electric wires and sockets
Fig. 3.84. Sequence of a tightening of bolts of fastening of a head of the block of cylinders
– a six-sided key on 10 mm, in sequence, return to a tightening, gradually weaken, and then turn out completely bolts of fastening of a head of the block of cylinders (see
Fig. 3.80. Screw-driver use for separation of a head from the block of cylinders
– remove a head from the block of cylinders. If the head sits very densely, a screw-driver from outside, an opposite chain of a drive of the gas-distributing mechanism, separate a head from the block of cylinders
At replacement of a head of the block in system of cooling it is necessary to fill in fresh cooling liquid.
Fig. 3.81. Scraper use for cleaning of a privalochny surface of the block of cylinders
Privalochnye surfaces of a head and the block of cylinders should be absolutely pure. For their cleaning use a firm plastic or wooden scraper
. When cleaning be careful, as the aluminum alloy is very easy for damaging. Be convinced that the deposit did not get to canals of system of greasing and cooling. It is especially important for greasing system as the deposit can block supply of oil to engine details. If necessary clean channels. If pollution got to cylinders, remove them from there with the vacuum cleaner.
Check privalochny surfaces of a head and the block of cylinders: on them there should not be notches, deep scratches and other damages. It is possible to eliminate small defects with machining. At major defects of a detail are subject to replacement.
Tap clear a carving of openings for bolts of fastening of a head of cylinders in the block. Clear openings under bolts in the block. Vvorachivaniye of a bolt in the opening filled with oil can break off the block because of hydraulic pressure.
Installation make in the following order:
– establish details and knots which acted in film from a head of the block of cylinders;
– check that directing plugs are established in the block of cylinders;
New laying of a head of the block of cylinders take from packing directly ahead of installation.
Fig. 3.82. Arrangement of marking (1) laying
– establish laying on directing plugs, thus an inscription of "top" it should be directed to a head, and marking 1
of laying to settle down from the back party of the engine;
Fig. 3.83. Places of drawing of a layer of RTV hermetic on laying of a head of the block of cylinders
– put on laying a RTV hermetic layer in width of 2,5-3,0 mm in the places shown on
– establish a head on the block of cylinders, without breaking the provision of laying;
– put on a carving and under heads of bolts a thin layer of engine oil, insert bolts of fastening of a head of the block of cylinders and tighten them by hand;
– in the sequence shown on
, in two stages tighten bolts of fastening of a head of the block of cylinders:
– the 1st — tighten the moment of 79 N • m;
– the 2nd — tighten on a corner 90 °.
Further it is not required additional pulling up of bolts of fastening of a head of the block of cylinders.
Further installation of a head of the block of cylinders is carried out to sequences, return to removal, taking into account the following.
Check and, if necessary, adjust gaps of valves.
Fill in cooling liquid.
Establish the new oil filter and fill in in the engine engine oil.
Start up the engine and check on absence of leaks.