Chevrolet Sonic Repair Manual: Cylinder Head Cleaning and Inspection
- Valve Cleaning and Inspection
-
Warning:
Bodily injury may occur if the cleaning solvent is
inhaled or exposed to the skin.
Note:
Do not scratch the valve stem with the wire brush.
- Clean the valves of carbon, oil and varnish. Carbon can be removed with
a wire brush. Varnish can be removed by soaking in Parts Immersion Solvent.
- Clean the valve guides.
- Inspect the valve stem for wear (4).
- Inspect the valve key groove for chipping or wear (5). Replace the valve
if chipped or worn.
- Inspect the valve face for burning or cracking (1). If pieces are broken
off, inspect the corresponding piston and cylinder head area for damage.
- Inspect the valve stem for burrs and scratches. Burrs and minor scratches
may be removed with an oil stone.
- Inspect the valve stem for straightness and the valve head for bending
or distortion (3) using V blocks. Bent or distorted valves must be replaced.
- Clean the deposits from the valve face. Inspect the valve face for grooving.
- Replace the valve if the face is grooved. Valve faces cannot be machined.
If worn, or damaged, the valves must be replaced.
- The valves may be lightly lapped to the valve seats.
- Cylinder Head and Gasket Surface Cleaning and Inspection
-
- Remove the spark plugs. Refer to Spark Plug Replacement.
- Inspect the cylinder head gasket and mating surfaces for leaks, corrosion
and blow-by. If the gasket has failed, use the following faults to determine
the cause:
- Improper installation.
- Loose or warped cylinder head.
- Missing, off location or not fully seated dowel pins.
- Corrosion in the seal area around the coolant passages.
- Chips or debris in the cylinder head bolt holes.
- Bolt holes in the cylinder block not drilled or tapped deep enough.
- Inspect the cylinder head gasket surface.
- Cylinder head may be reused if corrosion is found only outside a 4 mm (0.375 in)
band around each combustion chamber (1).
- Replace the cylinder head if the area between the valve seats is cracked (2).
- Replace the cylinder head if corrosion has been found inside a 4 mm (0.375 in)
band around each combustion chamber (3).
- Clean the cylinder head bolts.
Note:
Do not use a wire brush on any gasket sealing surface.
- Clean the cylinder head. Remove all varnish, soot and carbon to the bare
metal.
- Clean the valve guides.
- Clean the threaded holes. Use a nylon bristle brush.
- Clean the remains of the sealer from the plug holes.
- Inspect the cylinder head bolts for damaged threads or stretching and damaged
heads caused by improper use of tools.
- Replace all suspect bolts.
- Inspect the cylinder head for cracks. Check between the valve seats and
in the exhaust ports.
Note:
Do not attempt to weld the cylinder head, replace it.
- Inspect the cylinder head deck for corrosion, sand inclusions and blow holes.
- Inspect the cylinder head deck surface for flatness. Refer to Engine Mechanical
Specifications. If the cylinder head is out of specification, replace the cylinder
head. Do not machine the cylinder head.
- Inspect all the threaded holes for damage. Threads may be reconditioned
with thread inserts.
- Inspect the sealing surfaces.
- Inspect the cylinder head plugs.
Special Tools
EN-958 Valve Stem Seal Installer
EN-8062 Valve Spring Compressor
EN-8062-5 Adapter
EN-50717-2 Compressor Assembly of EN-50717 Kit
For equivalent regional tools, refer to S ...
Special Tools
EN-840 Pliers/Remover
EN-8062 Valve Spring Compressor
EN-8062-5 Adapter
EN-50717-2 Compressor Assembly of EN-50717 Kit
For equivalent regional tools, refer to Special Tool ...
Other materials:
Rear Side Door Window Weatherstrip Replacement (Sedan)
Rear Side Door Window Weatherstrip Replacement
Callout
Component Name
Preliminary Procedures
The rear door side window weatherstrip and window is serviced as
one assembly. Refer to Rear Side Door Stationary Window Replacement. ...
Engine Block Assemble
Install the 4 piston oil nozzles (1).
Caution: Refer to Fastener Caution.
Install the 4 piston oil nozzle bolts (2) and tighten to 25 Y (18 lb ft).
Install the knock sensor (2).
Install the knock se ...
Control Solenoid Valve and Transmission Control Module Assembly Installation
Control Solenoid Valve and Transmission Control Module Assembly Installation
Callout
Component Name
1
Control Solenoid Valve Assembly Filter Plate
Caution: Use care when removing or installing the filter plate
...
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