The Lanos model, until 2007, was produced under the brand name of the Korean company Daewoo. The car rightfully received the status of a national one, since it had a low cost and was especially popular, especially in Ukraine. In repair, the Lanos vehicle is quite simple, so many motorists repaired the power unit with their own hands.

Tightening cylinder head bolts.

Before proceeding to directly consider the moment of tightening the cylinder head, it is necessary to understand for what reasons the cylinder head can be removed . So, let's look at the main ones:

1. Engine repair , both capital and "tossing" oil scraper rings. To do this, you need to remove the block head, and then tighten the bolts correctly.
2. One of the diseases of Lanos can be called a breakdown of the head gasket . At the same time, to replace it, it is necessary to remove the cylinder head itself. It is worth noting that the new gasket must hold the seal tightly, so the tightening torque plays a big role.
3. Valve burnout - a good reason to remove the "head", so after the repair, tightening of the bolted connections will be required.
4. Replacing connecting elements , which requires the dismantling of the block head.

Example of a cylinder head gasket.

Tightening process and tightening torque on a Chevrolet Lanos

Cylinder head bolt tightening sequence.

The reasons have been established for which it is necessary to remove the cylinder head and then it is worth considering, the process itself and the tightening torque of the cylinder head. After installing a new gasket between the head and the block, we begin to wind the bolts. It is necessary to tighten the bolts in a certain sequence so that the cylinder head is pressed tightly against the block through the gasket.

Five stages of tightening

In the process of tightening the cylinder head on Lanos.

The tightening is carried out in five stages, which are known to most Lanos owners:

1. Bolts are tightened with force 25 Nm .
2. Turn the screws to 60 degrees, while applying force 45-50 Nm .
3. Once again, turn each bolt 60 degrees. In this case, the tightening force will be equal to 60-65 Nm .
4. The third time, each of the bolts should be rotated another 60 degrees. In this case, the tightening torque will be 70-80 Nm .
5. At the last stage, it is necessary to refine and turn the bolts for another 10 degrees. In the last puff, the moment will be - 85-90 Nm .

Mandatory use of a torque wrench!

conclusions

It is quite easy to tighten the cylinder head bolts on a Chevrolet Lanos with your own hands. It is worth remembering that the bolts are tightened in strict sequence and violation of this rule can lead to breakdown of the gasket.