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Use the following special tools to compress the valve spring. Remove the retainer lock.
- Valve spring compressor (MD998735)
- Retainer holder D (MB992283)
| note |
Store removed parts such as valves and springs with tags describing cylinder No. and installed
position for reassembly.
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Use Special Tool Valve Stem Seal Pliers (MB992085) to firmly pinch the valve stem seal
and twist it right and left for pulling out.
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1.Apply a small amount of engine oil to the valve stem seal.
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2.Use the valve stem as a guide and use Special Tool Valve Stem Seal Installer. Press fit
the valve stem seal into the valve guide.
Inlet side:
Valve stem seal installer (MB992284)
Exhaust side:
Valve stem seal installer (MD998775)
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Install the valve spring so that the painted side faces toward the camshaft.
| note |
Only the inlet valve spring has the painted side.
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| note |
The exhaust valve spring does not discriminate between the upward direction and the downward
direction.
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Use special tools to compress the valve spring and to install the retainer lock.
- Valve spring compressor (MD998735)
- Retainer holder D (MB992283)
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1.If the cylinder gasket is only replaced, check the notch shown in the illustration to
select the gasket that is the same in size.
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2.If either one of the cylinder block, piston, connecting rod and crankshaft is replaced,
select again the gasket according to the following procedures:
(1)
Keeping each piston at top dead centre, measure the amount of projection from the
block top at the 8 places shown in the illustration. Always measure it on the centre line of
the crankshaft.
(2)
Use the average of the 8 measurements to select the gasket size (A, B or C) according
to the table shown below. If either one of the measurements at 8 places exceeds the specified
maximum projection, use the gasket that is one size larger.
Type by size
|
Average piston projection mm
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Maximum piston projection mm
|
Tightened thickness mm
|
A (1 notch)
|
0.495 - 0.549
|
0.599
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1.26 - 1.34
|
B (2 notch)
|
0.549 - 0.603
|
0.653
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1.31 - 1.39
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C (3 notch)
|
0.603 - 0.658
|
-
|
1.36 - 1.44
|
| note |
If the projection amount of piston exceeds the allowable value, replace the piston, connecting
rod, crankshaft or cylinder block to check it again.
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3.Completely remove the liquid gasket on the upper plane of the cylinder block and the lower
plane of the cylinder head to remove grease.
4.
| caution |
The application location of the liquid gasket must not deviate.
If it deviates, the oil can possibly leak because the sealability is not maintained.
|
Apply the liquid gasket (Φ2 - 3 mm) to the upper plane of the cylinder
block, as shown in the illustration.
Specified sealant:
Three bond 1217G or equivalent
5.Install the cylinder head gasket.
| note |
Check that the centre of the liquid gasket is located toward the cylinder gasket in the
position specified in the illustration.
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6.Apply the liquid gasket (Φ2 - 3 mm) to the upper plane of the cylinder
head gasket, as shown in the illustration.
Specified sealant:
Three bond 1217G or equivalent
7.Install the cylinder head assembly.
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1.Install new cylinder head bolts in the following procedures.
| note |
The cylinder head bolts must not be reused.
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2.Apply an appropriate amount of engine oil to top and bottom surfaces of washers and
threaded portion of bolts.
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3.Install cylinder head bolts to the cylinder head.
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4.Tighten cylinder head bolts in several steps to the specified torque of 50 ± 2
N·m according to the assembly order.
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5.Put a paint mark on all of cylinder head bolt heads and cylinder heads.
6.Tighten the cylinder head 90° according to the tightening order.
7.Tighten a further 90°.
8.Completely loosen the cylinder head bolts.
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9.Tighten again cylinder head bolts in several steps to the specified torque of 50 ± 2
N·m according to the assembly order.
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10.
| caution |
- When the tightening angle
is smaller than the specified tightening angle, the appropriate tightening capacity cannot be
secured.
- When the tightening angle is larger than the specified tightening angle, remove
the bolt to start from the beginning again according to the procedure.
|
Tighten the cylinder head 90° according to the tightening order.
11.Tighten a further 90°.
12.Tighten it further 90°and make sure that the paint mark on the cylinder head
bolt is in the same straight line with the paint mark on the cylinder head.
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