Cylinder Head and Valves
02
020
19
RG,RG34710,70 –19–30SEP97–1/2
Head Gasket Inspection and Repair Sequence
RG8429 –UN–19MAY98
Cylinder Head Gasket Inspection
A—Combustion Seals B—Gasket Body C—Front of Engine
(Flanges)
The following inspection procedures are recommended
whenever a head gasket joint failure occurs or when
joint disassembly takes place.
1. Review historical data relating to machine
operation, maintenance and repair, along with
diagnostic observations. Note all areas requiring
further inspection and analysis.
2. Remove rocker arm cover and check for presence
of coolant in the oil.
3. Record head cap screw torques prior to removal.
Upon removal, check cap screw length differences.
4. Remove cylinder head using appropriate lifting
devices to prevent handling damage to head
gasket. (See REMOVE CYLINDER HEAD in this
group.)
5. Observe surfaces of removed head gasket.
Examine combustion seals (A) for the following:
• Flange severed/expanded/cracked/deformed.
• Adjacent body area burned/eroded.
• Fire ring severed/displaced/missing.
• Flange sealing pattern eccentric/contains voids.
• Discoloration of flange and adjacent body areas.
• Flange surfaces rough/abraided/channelled.
Examine gasket body (B) for the following:
• Combustion gas erosion paths or soot deposits
originating at combustion seals.
• Extreme discoloration/hardening/embrittlement in
localized areas.
• Oil or coolant paths from port areas.
• Localized areas of low compression.
6. Before cleaning components, inspect head, block,
and liners for evidence of combustion gas and fluid
leakage. Inspect cylinders and valve ports for
unusual deposits.
7. Clean cylinder block. (See INSPECT AND CLEAN
CYLINDER BLOCK in Group 030.) Clean cylinder
head. (See CLEAN AND INSPECT CYLINDER
HEAD in this group.) Clean liners. (See CLEAN
CYLINDER LINERS in Group 030.)
8. Proceed with the following dimensional checks and
visual inspections:
• Cylinder Head (this group)
– Check surface flatness/finish.
– Inspect for surface damage.
– Check cylinder head thickness, if resurfacing.
• Cylinder Block and Liners (assembled and
clamped) (Group 030)
CTM100 (06APR04)
02-020-19
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=91
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