Removal and installation of the cylinder head of the VAZ-2112 engine

Removal and installation of the cylinder head of the VAZ-2112 engine

We remove the cylinder head to replace the gasket under the head or to repair the cylinder head itself.

Removal of the cylinder head

Unscrewing the rocker cover bolts — Fig. 1. Unscrewing the rocker cover mounting bolts

Using an 8 mm socket, we unscrew the 15 bolts securing the rocker cover.

Removing the rocker cover — Fig. 2. Removing the rocker cover

We remove the cylinder head cover.
We remove the front cover of the timing belt.

Removal of the camshaft pulleys

Slackening the exhaust camshaft pulley bolt — Fig. 3. Slackening the exhaust camshaft pulley bolt

Holding the exhaust camshaft pulley from turning with a screwdriver, we slacken the bolt with a 17 mm spanner.

Slackening the inlet camshaft pulley bolt — Fig. 4. Slackening the inlet camshaft pulley bolt

In the same way we slacken the inlet camshaft pulley bolt.

Slackening the tensioner nut — Fig. 5. Slackening the timing belt tensioner nut

Using a 17 mm spanner, we slacken the belt tensioner nut.

Slackening the belt tension — Fig. 6. Slackening the belt tension

Turning the tensioner, we slacken the belt tension and remove the belt from the pulleys.

Removing the pulleys — Fig. 7. Removing the camshaft pulleys

We remove the camshaft pulleys.

Removal of the camshafts

Unscrewing the bearing housing bolts — Fig. 8. Unscrewing the mounting bolts of the camshaft bearing housing

Using an 8 mm socket, we unscrew the 20 bolts securing the camshaft bearing housing.

Unscrewing the rear mounting nuts — Fig. 9. Unscrewing the mounting nuts of the rear mounting bracket

Using a 15 mm socket, we unscrew the three nuts securing the rear mounting bracket.

Removing the bracket — Fig. 10. Removing the rear mounting bracket

We remove the bracket.

Removing the bearing housing — Fig. 11. Removing the camshaft bearing housing

We remove the camshaft bearing housing.
We withdraw the spark plug guide tubes from the housing.

Band on the inlet camshaft — Fig. 12. Band on the inlet camshaft (near the first journal)

To distinguish the shafts, a band is machined on the inlet shaft near the first journal.

Withdrawing the camshafts — Fig. 13. Withdrawing the camshafts

We withdraw the camshafts.

Removing the plugs — Fig. 14. Removing the camshaft plugs

We remove the camshaft plugs.
We remove the inlet and exhaust manifolds.

Removal of the cylinder head

Unscrewing the cylinder head bolts — Fig. 15. Unscrewing the cylinder head mounting bolts

Using a 10 mm Allen key and an extension bar, we unscrew the ten cylinder head bolts. We extract the bolts and washers.

Removing the cylinder head — Fig. 16. Removing the cylinder head

We remove the cylinder head.

Extracting the gasket — Fig. 17. Extracting the cylinder head gasket

We extract the gasket.

Installation of the cylinder head

Important! The gasket must not be reused.

Cylinder head bolt tightening sequence — Fig. 18. Cylinder head bolt tightening sequence

We install the cylinder head in the reverse order.

We tighten the bolts according to the sequence in three stages:

first stage – tighten to 20 N·m (2 kgf·m);
second stage – turn a further 90°;
third stage – turn a further 90°.

Note: Before fitting the bolts, check their length. If the bolts have stretched beyond 95 mm, they must be replaced.

Cylinder head components — Fig. 19. Cylinder head components: 1 - cylinder head; 2 - exhaust camshaft; 3 - oil seal; 4 - inlet camshaft; 5 - camshaft bearing housing; 6 - cylinder head cover; 7 - wiring harness mounting bracket; 8 - plugs; A - inlet camshaft identification band

Installation of the camshafts

Applying sealant to the bearing housing — Fig. 20. Applying sealant to the surface of the bearing housing

We apply sealant to the surface of the camshaft bearing housing.

Sealant application points — Fig. 21. Sealant application points on the bearing housing

We fit the bearing housing and evenly tighten the mounting bolts.

Fitting the guide tubes — Fig. 22. Fitting the spark plug guide tubes

Having lubricated the guide tube sealing rings with engine oil, we fit the tubes into the holes of the cylinder head and the bearing housing.
Before fitting the rocker cover we apply sealant.

Fitting the rocker cover — Fig. 23. Fitting the rocker cover