If the engine exhaust has a bluish smoke and the oil consumption has increased significantly during gas re-gasification, then it is time to replace the valve stem seals. Usually this should be done after 40,000 km, but given the quality of the engine oil, it can be done earlier. This can be done without removing the cylinder head from the engine, i.e. directly on the car. This requires a minimum of tools.
Necessary
- - a device for removing the drying out of the valves;
- - wooden block;
- - open-end wrench or socket head 13, 17;
- - open-end wrench 41 or ratchet wrench;
- - socket head 12;
- - screwdriver;
- - pliers
Instructions
Step 1
Remove the cylinder head valve cover. Turning the crank or open-end wrench to 41, set the piston of the first cylinder to top dead center. In this case, the marks on the crankshaft pulleys and the camshaft cover (long), the mark on the sprocket or, if there is no chain drive, on the camshaft pulley, the mark on the housing of its bearings must match.
Step 2
Release the levers (rocker arms). To do this, slightly screw the locknuts of the adjusting bolts and tighten the bolts until they stop. Bend the tensioner shoe with a tire changer on chain-driven engines, then fix the plunger in this position with the cap nut.
Step 3
Bend then the lock washer of the bolt that secures the sprocket to the camshaft; stop it. To do this, insert a wooden block into the hole between it and the cylinder head. Using a socket head or a 17 spanner wrench, unscrew its fastening bolt. Secure the chain to the sprocket with wire to prevent it from slipping off. Remove the sprocket from the camshaft.
Step 4
Remove the tension roller spring in belt driven engines (type 2105). Loosen the bracket mounting bolts and move it to the left. Remove the belt from the camshaft pulley. Unscrew the camshaft bearing housing with a 13 wrench, remove it together with the shaft from the studs.
Step 5
Replace valve stem seals. To do this, take a device for compressing the valve springs. Compress the springs and pull out the valve cotters. Work carefully as they can bounce off the side and get lost.
Step 6
Lower each valve until it stops in the piston crown, remove the poppets, springs, seat and spring from the cap, remove the valve stem seal with pliers or a screwdriver. Take a new cap and put it on the valve. It must be put on with effort, and if this does not happen, then it cannot be used.
Step 7
Before installing, remove the spring from the valve stem seal and lubricate it with engine oil. You can replace it with a conventional socket head for 12 or a special mandrel. Press on it evenly and until it stops, avoid distortions. Put on its spring. Install the springs, saddle, and crackers using a spring compression tool. Adjust the valve clearance of the 1st and 4th (where changed) cylinders.
Step 8
Place the sprocket along with the chain on the camshaft or the drive belt on its pulley. Rotate it 180 degrees. Carry out the same operation to replace the valve stem seals for the 2nd and 3rd cylinders. Then adjust the valve clearance.
