Fig. 26. Details of the upper part of the cylinder head: 1 - bolts (5 Nm); 2 - central cover (above the top of the intake manifold); 3 - bolts (25 Nm); 4 - Spark plug wire holders; 5 - throttle cable holder; 6 - rear left bracket of the upper part of the intake manifold; 7 - oil filler cap; 8 - sealing gasket; 9 - crankcase ventilation valve; 10 - ring in the cylinder head cover; 11 - nut (10 Nm); 12 - cylinder head cover; 13 - cylinder head cover sealing gasket; 14 - Fuel line holders; 15 - bolt (10 Nm); 16 - vacuum hose; 17 - sealing gasket of the upper part of the intake manifold; 18 - upper part of the intake manifold; 19 - Rear right bracket of the upper part of the intake manifold
The parts that need to be removed in order to remove the cylinder head from the cylinder block are shown in Fig. 26.
The cylinder head is removed from the engine on the vehicle if the entire engine does not need to be disassembled to fix the problem. Remove the cylinder head in the following order:
- disconnect the "-" terminal from the battery;
- remove the top part of the air filter;
- disconnect the throttle switch, heater element, mass air flow sensor and intake air temperature sensor connectors;
- remove the crankcase ventilation valve 9 (Fig. 26) from the cylinder head cover 12;
- disconnect the vacuum hose 16 of the activated carbon system from the upper part of the intake manifold 18. Make sure that the hose does not touch other parts;
- remove the air intake hose with the mass air flow sensor from the throttle body;
- remove the high voltage (HV) wires from the spark plugs;
Fig. 27. Upper part of the intake manifold: 1, 3, 4 - high voltage wire guides; 2 - central cover
- remove guides 1, 3, and 4 (Fig. 27) of the high voltage wires and unscrew bolts 1, shown in Fig. 26, and remove the central cover 2 of the upper part of the intake manifold;
- remove the throttle cable together with its support by unscrewing the support and removing the end of the cable. Do not remove the clamp holding the throttle cable in the support, as this will require adjustment of the throttle cable tension;
- open the expansion tank cap of the cooling system to remove any possible excess pressure and drain the coolant;
- mark the coolant hoses connected to the throttle body and remove them from the fittings;
- disconnect the secondary air intake valve vacuum hose;
- disconnect the brake booster vacuum hose from the intake manifold. The location of this connection is 16 (Fig. 26);
- remove the fuel lines (fuel supply and removal) from the holders 14 on the cylinder head and carefully disconnect the fuel hoses. Before removing the hoses, wrap a thick rag around the connection point, as the fuel system is under pressure;
- unscrew the dipstick guide tube located at the bottom of the intake manifold;
- unscrew the mounting bolts and remove the rear left 6 (Fig. 26) and right 19 brackets between the upper part of the intake manifold and the cylinder head;
- remove the upper part of the intake manifold 18 together with the throttle body. Make sure that the relief bushings do not pop out. The intake openings are now open, so close them in an appropriate way, for example, by plugging them with clean rags;
- unscrew the mounting bolts 15 and remove the cylinder head cover 12 together with the sealing gasket 13;
- on the side of the cylinder head cover, disconnect the electrical cable holder and the EGR valve (exhaust gas recirculation valve);
Fig. 28. Partially disassembled cylinder head (the parts located on the top of the head were removed): 1 - bolt, 25 Nm; 2 - belt tensioner; 3 - fuel supply distributor; 4 - sealing gasket of the lower part of the intake manifold; 5 - lower part of the intake manifold; 6 - lifting eye; 7 - bolt, 25 Nm; 8 - cylinder head mounting bolt; 9 - cylinder head; 10 - cylinder head gasket; 11 - bolt, 25 Nm; 12 - O-ring seal; 13 - thermostat housing; 14 - bolt, 10 Nm; 15 - cable holder; 16 - bolt, 10 Nm; 17 - ignition coil; 18 - bolts, 10 Nm; 19 - holder; 20 - sealing ring; 21 - chain tensioner, 30 Nm; 22 - bolt, 10 Nm; 23 - Hall sensor; 24 - spacer ring; 25 - O-ring seal; 26 - spacer ring; 27 - camshaft cover; 28 - O-ring seal
- then unscrew the holder 19 (Fig. 28), which secures the plug block with 42 contacts, as well as the additional pump of the cooling system, designed to protect the stopped engine from overheating;
- disconnect the coolant temperature sensor connector;
- remove the V-belt from the engine drive;
- disconnect the inlet pipe with the catalytic converter from the exhaust manifold;
Fig. 29. Ignition coil location: 1 - wire fastening; 2 - plug-in block; 3 - mounting bolt
- unscrew the mounting bolts 3 (Fig. 29) and disconnect the ignition coil 17 (Fig. 28) from the cylinder head;
- remove the steering drive (see subsection 12.1) so that the upper double-row chain of camshaft sprockets is released;
- unscrew the tensioner of the lower single-row intermediate shaft drive chain, located on the side of the cylinder head;
- remove the camshaft cover 27. When installing, the cover must be covered with sealant (AMV188 001 002). If only the cylinder head cover was removed, and the cylinder block itself was not removed, then the cylinder head gasket should be prepared for installation of the cover in accordance with the recommendations given below;
- disconnect all electrical wires from the cylinder head;
Fig. 30. Sequence of tightening the cylinder head bolts. Unscrew the bolts in the reverse order
- in several steps, in the reverse order to that shown in (Fig. 30), unscrew the cylinder head mounting bolts;
- remove the cylinder head. If it is stuck, you can hit it several times with a plastic or rubber hammer to make it easier to remove;
- if further disassembly of the cylinder head is required, the lower part of the intake manifold, belt tensioner, fuel distributor and other parts installed on the cylinder head should be removed.
Visitor comments