Section 6. Faults And Remedies For Diesel Engine; Hard Or Refuse To Start; Power Insufficiency - YANGDONG SERIES Y85 Operation & Maintenance Manual

SECTION 6. FAULTS AND REMEDIES FOR DIESEL ENGINE
I . Hard or Refuse to Start{see Table 4)
Table 4
Causes
Remedies
\
l.Fuel filters and fuel pipelines blocked.
2.Air trapped in fuel system.
3.Advanced fuel injection angle incorrect.
4.Fuel spray abnormal.
5.Compression preessure low.
6.Valve lash incorret.
7.Battery charge insufficient.
8.Wire connections loosened.
9.Ambient temperature too low, and oil
too viscous.
n .
Power Insufficient (see Table
S)
Table 5
Causes
l.Clean.
2.Exhaust air and tighten all fuel pipeline connector.
3.Readjust it according to specifications.
4.Readjust fuel injection pressure according to specifica-
tions and clean or replace injettor needle valve sets.
5.Cheak or replace piston rings, and cylinder liners.
Grind valves.Cylnder head nuts should
be
tightened in
case of leakage on cylinder head gaskets.
6.Adjust it according to specifications and align gear
marks.
7.Charge it.
8.Check and tighten wire connections.Clean up contact
points.
9.Preheat cooling water and lube oil.
Remedies
l.Compression pressure inside cylinders too
low.
2.Advanced fuel injection angle incorrect.
3.Valve lash incorrect.
4.Fuel supply for each cylinder unbalanced.
5.Air filter clogged.
6.Fuel injection pumps, fuel injector sets
worn off or fuel injection pressure incor-
rect.
7.Rotation speed incorrect.
l.Refer to item 5 in paragarph I and replace
components exceeding wear limit.
2.Adjust it according to specifications.
3.Adjust it according to specifications.
4.Adjust fuel injection pumps to proper supply.
5.Clean.
6.Replace them with new sets, adjust fuel injec
lion pressure and check fuel spray.
7.Adjust it with speed governing handle in order
to reach specified speed.
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