Cylinder Head Cleaning and Inspection
Valve Cleaning and Inspection
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Warning:
Bodily injury may occur if the cleaning solvent
is inhaled or exposed to the skin. |
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Note: DO NOT scratch
the valve stem with the wire brush.
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| 1. |
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. |
| 2. |
Clean the valve guides.
|
| 3. |
Inspect the valve stem for
wear (4). |
| 4. |
Inspect the valve key groove
for chipping or wear (5). Replace the valve if chipped or
worn. |
| 5. |
Inspect the valve face for
burning or cracking (1). If pieces are broken off, inspect the
corresponding piston and cylinder head area for damage.
|
| 6. |
Inspect the valve stem for
burrs and scratches. Burrs and minor scratches may be removed with
an oil stone. |
| 7. |
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. |
| 8. |
Clean the deposits from the
valve face. Inspect the valve face for grooving. |
| 9. |
Replace the valve if the face
is grooved. Valve faces cannot be machined. If worn, or damaged,
the valves must be replaced. |
| 10. |
The valves may be lightly
lapped to the valve seats. |
Cylinder Head and Gasket Surface Cleaning and Inspection
| 1. |
Remove the glow plugs.
|
| 2. |
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: |
| |
• |
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 |
| 3. |
Inspect the cylinder head
gasket surface. |
| |
• |
Cylinder head may be reused if
corrosion is found only outside 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 band around each combustion chamber
(3). |
| 4. |
Clean the cylinder head
bolts. |
|
Note: DO NOT use a
wire brush on any gasket sealing surface.
|
| 5. |
Clean the cylinder head.
Remove all varnish, soot and carbon to the bare metal. |
| 6. |
Clean the valve guides.
|
| 7. |
Clean the threaded holes. Use
a nylon bristle brush. |
| 8. |
Clean the remains of the
sealer from the plug holes. |
| 9. |
Inspect the cylinder head
bolts for damaged threads or stretching and damaged heads caused by
improper use of tools. |
| 10. |
Replace all suspect
bolts. |
| 11. |
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.
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| 12. |
Inspect the cylinder head deck
for corrosion, sand inclusions and blow holes. |
| 13. |
Inspect the cylinder head
sealing surface for flatness, using a straightedge (1). If the
cylinder head sealing surface is uneven, replace the cylinder head.
DO NOT machine the cylinder head. |
| 14. |
Inspect all the threaded holes
for damage. Threads may be reconditioned with thread
inserts. |
| 15. |
Inspect the sealing
surfaces. |
| 16. |
Inspect the cylinder head
plugs. |
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