Withdrawal
Attention! Dismantling of the cylinder head is carried out on the removed engine.
1. Remove the motor and place it on a suitable support or mounting stand (see relevant chapter).
2. Remove the camshaft drive chains (see relevant chapter).
3. Remove the accessory drive chain (see relevant chapter).
4. Unscrew bolts of fastening of a head of the block of cylinders in the sequence specified in an illustration, and accurately remove a head from the block of cylinders.
7.4. Unscrew bolts of fastening of a head of the block of cylinders in the specified sequence
Installation
Installation of a head of the block of cylinders is made in sequence, return to removal.
5. Check up a condition of a head of the block of cylinders and be convinced of absence of cracks and gouges.
6. Clean the threads of the holes for the cylinder head bolts. These holes must be free of oil or other contaminants. If necessary, blow out the holes with compressed air or clean with a screwdriver wrapped in rags that absorb liquid. Oil can be collected from the holes with a grease gun. If this is not done, then when the mounting bolts are screwed in, excess pressure will be created in the holes, which can lead to a rupture of the cylinder block or an incorrect tightening torque of the bolts.
7. Remove the remnants of the old seal from the surface of the cylinder block and head using a plastic scraper. Keep dirt and seal residues out of the cylinder bores. Close the cylinder bores with rags.
Attention! Cleaning of sealing surfaces with a metal brush or other metal tool is not allowed.
8. Check the cylinder head for distortion, deformation or warping with a feeler gauge and steel ruler (see illustration). The maximum allowable warping of the head should not exceed 0.1 mm. Modification of the cylinder head is allowed to a minimum size «A», which is 139.25 mm (see illustration 7.8a).
7.8. Check the cylinder head for warping, deformation, or warping with a feeler gauge and steel ruler | 7.8a. Modification of the cylinder head is allowed to a minimum size «A», which is 139.25 mm |
9. Inspect the removed cylinder head gasket and, if the pistons, connecting rods or crankshaft have not been replaced, install a new gasket of the same thickness as the old one. Marking inscription «Oben/Top» on the gasket, when laying it, it must be directed upwards, towards the cylinder head.
10. Check that the dowel pins are in the correct position (see arrows in illustration).
7.10. Make sure the dowel pins are in the correct position (see arrows)
11. Tighten the cylinder head bolts in several passes in the sequence shown in the illustration:
- 1st pass - tighten the bolts with a force of 30 Nm;
- 2nd pass - tighten the bolts to 60 Nm;
- 3rd pass - tighten the bolts 90°;
- 4th pass - Tighten the bolts 90°.
7.11. Tighten the cylinder head bolts in several passes in the sequence shown
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