S-12 Fuel Consumption Is Excessive - Komatsu PC88MR-10 Shop Manual

S-12 Fuel consumption is excessive

Fuel consumption is excessive.
Failure
Related
If any failure code is displayed, perform troubleshooting for that code first.
information
No. Cause
Excessive spill of fuel from
1
injector
Clogged fuel return piping
2
Defective injector
3
Fuel leakage from cylinder
4
head
Fuel leakage from supply
5
pump oil seal
Fuel leakage outside engine
6
PC88MR-10
(D37-B70-400-A-Z0-A)
Point to check, remarks
Measure spill rate from injector.
(Reference: See Testing and adjusting,
"Testing fuel discharge,
leakage".)
Check fuel return piping for clogging.
(Injection rate may be increased due to
clogged fuel return piping.)
Some cylinder is found to be cool when
exhaust manifolds are touched by hand
immediately after engine is started.
When engine is run in cylinder cutout mode
with some cylinder cutout, engine speed
does not change.
(Reference: See Testing and adjusting,
"Handling cylinder cutout mode operation".)
Check for increased oil level.
Check for smell of diesel fuel.
Check for increased engine oil level and
smell of diesel fuel.
Check supply pump oil seal.
Check for fuel leakage outside engine.
40 Troubleshooting
Troubleshooting of engine (S-mode)
Remedy
Replace injector.
Lots of dusts are is
probably in fuel. Check
return and
storage management
of fuel.
Correct or replace fuel
return piping.
Replace injector.
Repair defective parts.
Replace supply pump.
Repair defective parts.
40-531