Gasoline consumption has increased, the engine compression ratio has dropped below 10kgf / cm2, oil consumption has increased, and the exhaust gases have acquired a gray tint. It's time to replace the piston rings in the engine.
Necessary
- - keys
- - new rings
- - engine oil
- - a hammer
- - probe
Instructions
Step 1
Park your vehicle on a flyover or viewing pit. Remove the battery, ignition distributor, carburetor, ventilation hose, air filter housing. Drain the oil from the engine sump.
Step 2
Disconnect the wire from the coolant temperature sensor, remove the plug from the engine block with a key. Drain the coolant. Loosen the clamp and remove the “stove” hose from the branch pipe of the block head.
Step 3
Disconnect the brake booster and coolant hose from the inlet pipe fittings. Remove the hoses from the nipple located on the front of the block head.
Step 4
At the bottom of the car, unscrew the bolt of the clamp of the gearbox with the reception pipe, disconnect the resonator pipe. After unscrewing the 4 nuts that connect the front pipe to the manifold, disconnect the pipe from the engine.
Step 5
Unscrew the upper air collector fastening nut with a socket wrench. The front part of the starter shield is fastened by the lower nut, unscrew it with a key "13". Unscrew the back of the shield together with the pin. A through hole will appear in the exhaust manifold.
Step 6
To facilitate the removal and installation of the shield, remove the lower attachment eyelet. Then take the key "10" and unscrew the head cover fastener. To loosen the chain tension, unscrew the chain tensioner cap nut. Press the chain onto the tensioner shoe through the chain. After the tensioner plunger has sunk, tighten the cap nut.
Step 7
Bend the antenna at the lock washer and remove the screw securing the camshaft sprocket. Remove the sprocket and tie up the chain to prevent it from falling down. Starting at the base mark, add three more marks to the sprocket 90 degrees apart. This will make it easier to adjust the engine clearances.
Step 8
Remove the camshaft housing from the cylinder head studs by unscrewing the mounting nuts. Remove the bolts securing the head of the block, and then remove the bolt from the ignition distributor. Dismantle the block head with gasket. Using the "13" wrench, unscrew the nuts that are used to secure the engine mounts.
Step 9
Raise the engine over the cross member to remove the pallet. Jack up the vehicle until the left front wheel comes off. Place a stop in the heads of the bolts that attach the pallet and gently lower the machine. The left engine mount will move away from the cushion. Insert a block of a suitable size into the resulting gap and remove the stop.
Step 10
Unscrew the pallet screws and remove it. Dismantle the oil pump, connecting rod caps with bushings. With a light tap with a hammer handle, push out the piston with the upper bushing and connecting rod. Do not swap the earbuds if you do not intend to replace them with new ones. Remove carbon deposits from the top of the cylinder.
Step 11
Insert the upper compression ring into the cylinder to a depth not exceeding 5 mm, and measure the gap at the joint of the S1 ring with feelers. Move the ring 8-10mm and measure the S2 gap. Calculate the cylinder wear using the following formula: (S2 - S1) / 3, 14. If the indicator is less than 0.15mm, then replace the worn rings with the nominal ones.
Step 12
Check if the new rings fit into the cylinder. To do this, place them in the unworn, top of the cylinder. The joint at some rings, if necessary, nail down with a file. The gaps in the joints of the rings in the unworn cylinders should be within the following limits: 0, 30-0, 45mm - for the first compression; 0, 25-0, 40mm - for oil scraper and second compression. If the cylinders are worn out, focus on the lower values.
Step 13
Before installing, roll the rings over the piston grooves. Install the rings onto the piston. Be careful not to break the rather stiff second ring that has a groove at the bottom. Clean the mating surface of the block from carbon deposits and gasket residues. Set the two crankshaft journal journals at bottom dead center. Lubricate the piston and cylinder with engine oil. Install half of the bush in the connecting rod and lubricate it as well. Insert the piston into the cylinder.
