Simpsons SC213 - VALVE SPRINGS; To Remove the Valve Spring; To Refit; Renew the Valve Spring; VALVE STEM SEAL

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SC213 Diesel Engines
VALVE SPRINGS
To Remove the Valve Spring
1. Remove the rocker cover.
2. Remove the rocker assembly.
3. Rotate the crankshaft in the normal direction of
rotation until the relevant piston is approximately
at top dead centre (TDC).
4. Fit the valve spring Compressor as shown.
(Fig.K.10 )
5. Compress the valve spring and remove the cotters.
Caution: Ensure valve springs are compressed squarely.
Do not rotate the crankshaft while the valve springs are
removed.
6. Release the valve spring compressor and remove the
valve spring cap and valve spring.
Inspect the Valve Springs
Check the free length of each valve spring.
Free length: 50 mm (1.968 in.)
The fitted length of valve spring with 250 Nm (185 lbf.
ft) load: 28 mm (1.102 in.).
If they exceed the service limit, replace the springs.
To Refit/ Renew the Valve Spring
1. Place the new spring in position and install the valve
spring cap.
2. Fit the valve spring compressor, compress the valve
spring and fit the valve spring cotters. Remove the
valve spring compressor.
3. Fit the rocker assembly
4. Check the valve tip clearance.
5. Fit the rocker cover.
Note: If other valves springs are to be changed, they can
be changed at the same time. The pistons move as pair.
VALVE STEM SEAL
To Change Valve Stem Seal
1. Remove the rocker cover
2. Remove rocker shaft.
3. Remove the valve spring retainers (cotters), valve
spring cap and valve spring.
4. Remove the valve stem seals with pliers.(Fig.K.11 )
Note: Do not reuse the valve stem seal.
Clean each part and apply engine oil to the sliding
parts.
5. Using special tool valve stem seal replacer, gently
tap the seal into position.
6. Check and ensure the valve moves smoothly.
Note: Incorrect installation of the seal could result in oil
leakage past the valve guide.
Fig: K.9
Fig: K.10
Fig: K.11
Fig: K.12