Cylinder head bolts
Remove the cylinder head only when the engine is cold. The exhaust and intake manifolds remain connected.
A defective cylinder head gasket is recognized by the following symptoms:
- power loss;
- coolant leak, white exhaust gas when the engine is warm;
- oil leak;
- coolant in the engine oil, the oil level does not fall, but increases;
- gray color of engine oil, shreds of foam on the dipstick, liquid oil;
- engine oil in the coolant;
- the coolant boils strongly;
- no compression in two adjacent cylinders.
Removing
1. Raise the engine hood.
2. Disconnect the wire "masses" batteries (–).
Attention! Disconnecting the battery clears the radio's anti-theft code. See instructions in subsection 13.1.7.
3. Remove the cylinder head housing.
4. Remove the coolant thermostat (thermostat).
5. Remove two 8mm bolts (1) on both sides of the front cover (23). Behind the cover are unloading bushings.
6. Remove the bolts (2) (thread diameter 6 mm).
7. Peel off the cover (23), while observing the O-ring between the cover and the cylinder head. Clean sealing surfaces.
8. Unscrew the inlet gas line (19) away from the cylinder head and set aside with wires connected.
9. Unscrew holder (2) crankshaft position sensor located behind the cylinder head.
10. Disconnect the ventilation hoses (6) at the bottom of the cylinder head.
11. Disconnect the connector for the lambda probe (in the area of the battery).
12. Unscrew the oil dipstick guide tube in the cylinder head. For automatic transmission, also unscrew the guide tube of the oil gauge behind the cylinder head.
13. Drain the coolant, including from the crankcase.
14. Unscrew the exhaust pipe from the exhaust manifold.
15. 2.2L engine: turn the camshaft adjuster to the right as far as it will go in the direction "spat" (late).
16. Set the engine to 20°after TDC ignition of the first cylinder and remove the chain tensioner.
17. Paint the position of the control chain in relation to both camshaft gears by drawing a line across the chain and sprocket.
18. Unscrew the exhaust camshaft pulley from the crankshaft flange.
19. 2.0L engine: Unscrew the intake camshaft gear.
20. 2.2L engine: holding the anchor (2) camshaft adjuster, unscrew the shoulder bolt (1). Remove the anchor from the control piston (18). Unscrew the nut (6).
21. Remove the control chain.
22. 2.2L engine: mark the position of the intake camshaft gear in relation to the flange shaft by drawing a stroke of paint through both parts. Remove the cover (12), intake camshaft gear (13), setting piston (14) and a spherical spring (14a). Dismantle the flanged shaft (16).
23. Pull out the guide pins using an impact puller or a suitable tool (11).
24. Unscrew the four combination bolts (A) between the upper and lower chain case cover. Unscrew the cylinder head bolts in the reverse order of their numbering in the figure, i.e. from the tenth to the first. This requires a wrench attachment, e.g. HAZET 990 SLg-12 (see fig. Cylinder head bolts).
25. Raise the cylinder head. This can also be done with a crane by inserting a suitable cable or chain into the eyes.
Installation
1. Before assembly, clean the cylinder head and cylinder block of sealant residues with a suitable scraper. Make sure that these residues do not get into the holes. To do this, cover the holes with a rag.
2. Using a steel ruler, check the cylinder head and engine block for flatness in the longitudinal and transverse directions, modify if necessary (in the repair shop).
3. Check the cylinder head for cracks, and the working surface of the cylinder for scratches, scratches.
4. Clean the cylinder head bolt holes of oil and other deposits.
5. Be sure to replace the cylinder head gasket.
6. Apply a new gasket without sealant so that the holes are not blocked.
7. Install the cylinder head. Before installing, make sure that the camshafts and crankshaft are in the same position as when removed and not rotated.
Attention! The cylinder head is centered in the cylinder block by dowel pins.
8. Measure the length of the cylinder head bolts which is 102mm in new condition. Stick to this length when tightening. For a length of 105 mm, replace the cylinder head bolts.
9. Lubricate the threads of the cylinder head bolts and their contact with the cylinder head with oil, install the bolts and tighten by hand.
10. Tighten the cylinder head bolts in sequence 1 to 10 (see fig. Cylinder head bolts) in three stages.
Attention! Carefully tighten the cylinder head bolts. Before tightening, check the torque wrench for accuracy.
First tighten the cylinder head bolts with a torque wrench in sequence from 1 to 10 to 55 Nm. In the second step, tighten all bolts 1 to 10 by another 90°with an open end wrench. In the third step, tighten the cylinder head bolts 1 to 10 by 90°in the same direction with an open end wrench.
Attention! When tightening the cylinder head bolts, position the wrench handle along the engine and turn in one motion until it is across - to rotate 90°.
11. Combined bolts (A) tighten the control housing covers with a torque of 20 Nm.
12. Coat the guide pins with Mercedes N 002 989 00 20 10 sealant or other suitable sealant and drive in.