S-6 Engine Stops During Operation - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting of engine (S-mode)

S-6 Engine stops during operation

Engine stops during operation.
Failure
Related
If any failure code is displayed, perform troubleshooting for that code first.
information
No. Cause
1 Insufficient fuel in tank
Clogged air breather hole in
2
fuel tank cap
Clogged fuel filter element
3
Foreign material in fuel
4
Air in fuel piping system
5
Leakage from fuel piping
6
system
Defective priming pump
7
Defective supply pump
8
Defective air intake hose
(between air cleaner and
9
variable flow turbocharger
inlet)
10 Defective air intake manifold
Defective boost piping and
connections
11 (between variable flow
turbocharger outlet and air
intake manifold)
Defective exhaust gas piping
12 (from exhaust manifold to
KDOC muffler inlet)
13 Damaged valve or rocker arm
Broken or seized piston
14
connecting rod
Broken or seized crankshaft
15
bearing
Defective wiring harness of
engine controller power
16
supply
40-522
(PC88MR-AF0-400-A-Z0-A)
Point to check, remarks
Fuel tank is empty.
Air breather hole in fuel tank cap is clogged.
Check used hours of fuel filter. If used
beyond specified hours, fuel filter element
may be clogged.
Rust and water are found in fuel drained
from fuel tank.
Air is bled during air bleeding of fuel system.
(Reference: See Testing and adjusting,
"Bleeding air from fuel system".)
Fuel leaks from fuel piping.
(Reference: See Testing and adjusting,
"Testing fuel circuit for leakage".)
No resistance is felt or large effort is
required when operating priming pump.
See Testing and adjusting, "Testing fuel
discharge, return and leakage".
Visually check air intake hose for breakage. Replace air intake
Check air intake manifold for internal
breakage.
Air leaks from boost piping.
Check exhaust gas piping for damage and
exhaust gas leakage.
(Check soot on heat insulation cover and
heat insulation plate.)
Check valve and rocker arm.
(Unusual noise is heard and engine stops
suddenly.)
Metal particles are found in oil drained from
oil pan.
Remove oil pan and check piston and
connecting rod.
(Reference: Unusual noise is heard and
engine stops suddenly, or stops due to
overheat.)
Metal particles are found in oil drained from
oil pan.
Remove oil pan and check crankshaft main
bearing.
Check wiring harness of engine controller
power supply.
(Reference: See Troubleshooting, "Failure
code [CA343]".)
Remedy
Add fuel.
Flush air breather hole
in fuel tank cap and
clean surrounding
area.
Replace fuel filter
element.
Replace fuel.
Perform air bleeding.
Repair or replace fuel
piping.
Repair or replace fuel
piping related parts.
Replace priming pump.
Replace supply pump
or pressure limiter.
hose.
Replace air intake
manifold.
Correct or replace
boost piping.
Replace exhaust gas
piping.
Replace valve or
rocker arm.
Replace piston and
connecting rod.
Replace crankshaft
main bearing.
Repair wiring harness
of engine controller
power supply.
PC88MR-10