Pic. 2.201. Cylinder head components:
1 - connecting hose (in vehicles with BLE and BWF engines); 2 - sealing cuff (in vehicles with BLE and BWF engines); 3 - holder (in vehicles with BLE and BWF engines); 4 - soundproof cover (in vehicles with BLE and BWF engines); 5 - cylinder head cover (in vehicles with BLE and BWF engines); 6 - soundproof cover (for vehicles with engine codes AYH, BKW); 7 - cylinder head cover (for vehicles with engine codes AYH, BKW); 8 - bolt 20 Nm; 9 - cylinder head gasket; 10 - cylinder head; 11 - cylinder head bolt; 12 - sealing cuff; 13 - adapter (for vehicles with engine codes AYH, BKW).
ATTENTION: The connection of the block head and the aluminum cylinder block with the crankshaft support ramp is carried out with anchor bolts. Both cylinder heads need to be replaced. When loosening and unscrewing the cylinder head bolts, warping of the cylinder block occurs.
NOTE: The components of the first bank of cylinders are shown here. In mirror image, they correspond to the components of the second row of cylinders.
Removing
Remove the engine and gearbox.
Remove the soundproof cover and cylinder head cover from the cylinder heads.
Remove the fuel pump and tandem pump from the cylinder heads.
Set the crankshaft to the dead center position of the first cylinder, check the valve timing.
Remove the camshaft drive gears.
Unscrew the fixing bolts between the timing cover and the block head of the first and second row of cylinders.
Loosen and unscrew the cylinder head bolts in the specified sequence (pic. 2.202) shows in the direction of travel).
With the help of an assistant, carefully remove the cylinder heads.
NOTE: Handle the cylinder head very carefully to avoid damage. Put a clean rag into the cylinders so that dirt and emery residue do not get between the cylinder mirrors and the pistons. Check that dirt and emery residues do not get into the coolant either.
NOTE: Carefully clean the seating surfaces of the cylinder head and cylinder block. This should not leave long scratches and burrs (when using sandpaper, its grain size should be at least 100).
Installation
NOTE: Always replace cylinder head bolts. Remove a new cylinder head gasket from the packaging immediately before installation.
NOTE: Install a cylinder head gasket with the same index «Dlcke/Thickness» removed gasket.
NOTE: The gasket must be handled with great care. Damage to the silicone layer and corrugated joints lead to loss of tightness.
Before installing the cylinder heads, set the crankshaft to the dead center position of the first cylinder.
Rotate the crankshaft against the direction of engine rotation until all pistons are evenly below dead center.
Install the cylinder head gasket.
Install the cylinder head, taking into account the position of the compensation pad (pic. 2.203), install the cylinder head bolts with washers and tighten by hand.
CAUTION: All cylinder head bolts except (by tightening sequence) numbers 1, 2, 17 and 19 must be equipped with slotted washers.
Tighten the cylinder heads in four stages in the tightening sequence shown ((pic. 2.204) shows the direction of travel).
1 - Tighten with a torque wrench:
- stage 1 = 30 Nm;
- stage 2 = 60 Nm.
2 - Next, rotate with a regular key:
- step 3 = tighten 1/2 turn (180°);
- step 4 = tighten 1/2 turn (180°).
Install the camshaft drive gears.
Adjust the valve timing.
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