Withdrawal
1. Head of the left semi-block: remove the generator bracket. Head of the right semi-block: remove the oil dipstick guide.
2. Remove the intake manifold.
3. Remove the air bleed tube from the cooling system.
4. Remove the exhaust manifold of the left and/or right half block.
5. Remove push rods.
6. If equipped: Remove the grounding bar bolt at the rear of the left half block head or at the front of the right half block.
Tire of the left semi-block | Tire of the right semi-block. 1 - bolt, 2 - battery cable, 3 - ground bar |
7. If installed: separate the ground bar from the block head.
8. Turn away bolts of fastening of a head of the block. Discard the bolts, do not re-install the bolts.
Bolts of fastening of a head of the block of engines of late models | Bolts of fastening of a head of the block of engines of early models |
9. Remove the cylinder head, discard the head gasket.
Installation
Attention: before installation, clean the mating surfaces of the block head and cylinder block. The threaded holes for the head bolts in the block must be clean and dry. Do not lubricate the gasket or apply sealant to it.
1. If necessary, clean the threaded holes with a tap.
2. Clean threaded holes with solvent.
3. Dry the threaded holes with compressed air.
Warning: wear protective goggles.
4. Check the performance "A" guide pins.
performance "A" = 6 mm
5. Install a NEW head gasket.
Attention:
- Left half-block head: when the gasket is correctly installed, the FRONT mark should be on the left and the protrusion from the bottom of the gasket should be left of the center.
- Right half-block head: when the gasket is correctly installed, the FRONT mark should be on the right and the protrusion from the bottom of the gasket should be to the right of the center.
- The gasket must be of a certain thickness, see the identification marks on the gasket.
6. Install the block head on the guide pins.
7. The holes in the block for the bolts of the head of the block have two versions: with short and long threads (first design) and only with short thread (2nd construction).
Before installing the bolts, measure the depth of the threaded holes.
8. Install NEW head bolts.
9. Tighten the block head bolts in the sequence shown in the accompanying figure, see the figure on the next page.
Torque:
- First design:
- bolts M11 (1-10) 1st pass 30 Nm
- bolts M11 (1-10) turn 2nd pass 90°
- bolts M11 (1-8) turn 3rd pass 90°
- bolts M11 (9 and 10) turn 3rd pass by 50°
- M8 bolts (11-15) 30 Nm
- Second design:
- bolts M11 (1-10) 1st pass 30 Nm
- bolts M11 (1-10) turn 2nd pass 90°
- bolts M11 (1-10) turn 3rd pass by 70°
- M8 bolts (11-15) 30 Nm
To point 9, the tightening sequence of the cylinder head bolts
10. If equipped: Install a ground bar at the back of the left half block head or at the front of the right half block head. Tighten the mounting bolt. Tightening torque 16 Nm.
11. Install the push rods.
12. Install the left half-block exhaust manifold.
13. Install the cooling system air vent pipe.
14. Install the intake manifold.
15. Install the alternator bracket and/or dipstick guide.