Execution sequence
1. We prepare the car for work (see «Preparing the car for maintenance and repair»).
2. Remove the cylinder head (see «Cylinder head - gasket replacement»).
3. On engines 1.4 and 1.6 DOHC, for convenience, remove the receiver (see «Receiver and intake manifold of 1.4 and 1.6 DOHC engines - replacement of gaskets»).
4. We clean the cylinder head from dirt and carbon deposits, wash it from oil deposits, remove carbon deposits from the walls of the combustion chambers with a metal brush.
5. Carefully inspect the cylinder head for cracks. Valves and their seats must not have cracks or burn marks.
6. Check the flatness of the head. We carry out the work in two stages. This requires a special template, but if it is not there, then you can check the lower mating plane of the head with a sufficient degree of accuracy using a wide locksmith's ruler. With an edge, we apply a ruler diagonally to the plane of the head. We make sure that there is no gap between the edge of the ruler and the plane of the head. The gap can be observed both in the middle part of the plane and along its edges. We measure the gap along both diagonals with a set of flat probes.
The maximum allowable gap is 0.05 mm.
Recommendation. If the gap is greater than the allowable, the head is subject to milling of the mating plane or replacement.
7. Check the tightness of the valves. To do this, fill the combustion chambers of the block head with kerosene and wait a few minutes. If the level of kerosene in any chamber drops, then one or more valves are leaking.
If a leak is found, the valves must be lapped (see below, «Valves - Lapping»).
Visitor comments