This instruction show you guide on how to replace valve springs,retainers and seals for Toyota Corolla.
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Note: Broken valve springs and defective valve stem seals can be replaced without removing the cylinder head. Two special tools and a compressed air source are normally required to perform this operation, so read through this Section carefully. The universal shaft-type valve spring compressor required for the tight valve spring pockets of this vehicle may not be available at alt tool rental yards,
so check on the availability before beginning the job.
1 Remove the valve cover (see Section 4). Refer to Section 7 and remove the timing chain, then refer to Section 8 and remove the camshafts and lifters from the cylinder head.
2 Remove the spark plug from the cylinder that has the defective component. If all of the valve stem seals are being replaced, all of the spark plugs should be removed.
3 Turn the crankshaft until the piston in the affected cylinder is at top dead center (TDC) on the compression stroke (see Section 3 for instructions). If you’re replacing all of the valve stem seals, begin with cylinder number one and work on the valves for one cylinder at a time. Move from cylinder-to-cylinder following the firing order sequence (see the Specifications listed at the beginning of this Chapter).
5 Apply compressed air to the cylinder.The valves should be held in place by the air pressure. Warning: If the cylinder isn’t exactly at TDC, air pressure may force the piston down, causing the engine to quickly rotate. DO NOT leave a wrench on the crankshaft drive sprocket bolt or you may be injured by
the tool.
6 Stuff shop rags into the cylinder head holes around the valves to prevent parts and tools from falling into the engine.
7 Using a socket and a hammer, gently tap on the top of each valve spring retainer several times. This will break the bond between the valve keepers and the spring retainer and allow the keepers to separate from the valve spring retainer as the valve spring is compressed.
8 Use a valve spring compressor to compress the spring, then remove the keepers with small needle-nose pliers or a magnet (see illustrations). Note: Several different types of tools are available for compressing the valve springs with the head in place. Be sure to purchase or rent the “import type”
that bolts to the top of the cylinder head. This type uses a support bar across the cylinder head for leverage as the valve spring is compressed. The lack of clearance surrounding the valve springs on these engines prohibits typical types of valve spring compressors from being used.
9 Remove the valve spring and retainer.
Note: If air pressure fails to retain the valve in the closed position during this operation, the valve face or seat may be damaged. If so, the cylinder head will have to be removed for repair.
10 Remove the old valve stem seals, noting differences between the intake and exhaust seals (see illustration).
11 Wrap a rubber band or tape around the top of the valve stem so the valve won’t fall into the combustion chamber, then release the air pressure.
12 Inspect the valve stem for damage. Rotate the valve in the guide and check the end for eccentric movement, which would indicate that the valve is bent.
13 Move the valve up-and-down in the guide and make sure it doesn’t bind. If the valve stem binds, either the valve is bent or the guide is damaged. In either case, the head will have to be removed for repair.
14 Reapply air pressure to the cylinder to retain the valve in the closed position, then remove the tape or rubber band from the valve stem.
15 Lubricate the valve stem with engine oil and install a new seal on the valve guide (see illustration).
16 Install the valve spring and the spring retainer in position over the valve,
17 Compress the valve spring and care fully position the keepers in the groove. Apply a small dab of grease to the inside of each keeper to hold it in place (see illustration).
18 Remove the pressure from the spring tool and make sure the keepers are seated.
19 Disconnect the air hose and remove the adapter from the spark plug hole.
20 Install the camshaft, lifters, timing chain and the valve cover by referring to the appropriate Sections.
21 Install the spark plugs and the ignition coils.
22 Start and run the engine, then check for oil leaks and unusual sounds coming from the valve cover area.
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