Universal M-25XP - Page 180

TROUBLESHOOTING
Piston ring stuck.
I
Piston ring worn.
Lubricant
rises through piston gap.
I
Excessive gap between cylinder liner and piston.
Too much
oil.
I
Injection delayed.
I
Compression pressure insufficient.
I
Injection too early.
Injection mistimed.
I
I
Injection delayed.
Plunger does
not return completely because
Fuel pump's injecting capacity
spring
is stuck or broken.
varies.
Plunger worn.
Needle valve stuck.
I
Nozzle does not inject fuel
I
Nozzle spring broken.
I
properly.
I
Too much carbon sticks to nozzle tip.
Injection pressure too low.
____________________________________________ ~r----1~-----c-o-m-p-r-es-s-ed--a-ir-1_ea_k_s_. ______________________ -i
Y Not enough air.
Excessive
gap between piston and liner.
Piston ring stuck.
Piston ring worn.
Excessive
gap between intake/exhaust valve and
valve stem.
Valve stem seal broken.
Oil leaks from defective packings.
t
l r---+
Injection pump plunger leaks much fuel.
Fuel mixed with oil.
I
L...,.
Fuel pump leaks much fuel.
I
I
Head gasket packing faulty.
Water mixed with oil.
I
I
J
I
Crankcase cracked.
Gear oil mixed with oil.
Hydraulic pump's oil seal broken.
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