Cylinder Head and Valves
02
020
17
RG,RG34710,69
–19–01NOV00–1/2
Diagnosing Head Gasket Joint Failures
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A
B
C
RG8430
–UN–22MAY98
Cylinder Head Gasket Sealing Area
A—Combustion Sealing Areas
B—Coolant Sealing Areas
C—Cylinder Head Cap Screws
Head gasket failures generally fall into three categories:
•
Combustion seal leakage.
•
Coolant seal leakage.
•
Oil seal leakage.
Combustion seal leakage failures occur when combustion
gases escape between cylinder head and head gasket
combustion flange, or between combustion flange and
cylinder liner. Leaking combustion gases may vent to an
adjacent cylinder, to a coolant or oil passage, or
externally.
Coolant or oil seal failures occur when oil or coolant
escapes between cylinder head and gasket body, or
between cylinder block and gasket body. The oil or
coolant may leak to an adjacent coolant or oil passage, or
externally.
Follow these diagnostic procedures when a head gasket
joint failure occurs or is suspected:
1. Before starting or disassembling engine, conduct a
visual inspection of machine, and note any of the
following:
•
Oil or coolant in head gasket seam, or on adjacent
surfaces, especially right rear corner of gasket joint.
•
Displacement of gasket from normal position.
•
Discoloration or soot from combustion gas leakage.
•
Leaking radiator, overflow tank, or hoses.
•
Leaking coolant from coolant pump weep hole.
•
Damaged or incorrect radiator, fan, or shroud.
•
Obstructed air flow or coolant flow.
•
Worn or slipping belts.
•
Damaged or incorrect pressure cap.
•
Presence of oil in coolant.
•
Low coolant levels or improper coolant.
•
Unusually high or low oil levels.
•
Oil degradation, dilution, or contamination.
•
Correctly specified electronic unit injectors.
•
Indications of fuel delivery or gear train not properly
timed.
•
Unburned fuel or coolant in exhaust system.
CTM100 (06APR04)
02-020-17
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=89
Continued on next page
Содержание 6105ADW
Страница 14: ...Contents 01 02 03 04 05 06 INDX CTM100 06APR04 ii POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Страница 16: ...Contents 01 CTM100 06APR04 01 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Страница 50: ...Contents 02 CTM100 06APR04 02 4 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 4 ...
Страница 302: ...Cooling System 02 070 16 CTM100 06APR04 02 070 16 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 300 ...
Страница 328: ...Air Intake and Exhaust System 02 080 26 CTM100 06APR04 02 080 26 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 326 ...
Страница 330: ...Fuel System 02 090 2 CTM100 06APR04 02 090 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 328 ...
Страница 334: ...Contents 03 CTM100 06APR04 03 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Страница 341: ...Base Engine Operation 03 120 7 CTM100 06APR04 03 120 7 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 339 ...
Страница 348: ...Base Engine Operation 03 120 14 CTM100 06APR04 03 120 14 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 346 ...
Страница 350: ...Contents 04 CTM100 06APR04 04 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Страница 376: ...Contents 05 CTM100 06APR04 05 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Страница 412: ...Contents 06 CTM100 06APR04 06 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Страница 444: ...Diagnostic Specifications 06 210 8 CTM100 06APR04 06 210 8 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 442 ...