Abnormal Engine-Oil Pressure; Smoke Emitted In Exhaust Gas - FAW Jiefang Automotive 485 Operation & Maintenance Manual

Trouble causes
1. No or little pressure for engine-oil
(1) Engine-oil level too low; oil deteriorates or
is thinned.
(2) Oil pipe is broken; pipe joint not tight
enough causing oil leakage; engine-oil pressure
gauge is damaged.
(3) Engine-oil pump pressure-adjusting spring
is deformed or broken.
(4) Engine-oil pump has too much clearance.
(5) Engine-oil pump gasket is broken.
(6) fit clearance between bearings is too much.
(7) Oil-passage screw-plug is loosened and
leaks.
2. Engine-oil pressure too high
(1) Engine-oil pump's pressure-limiting valve
does work abnormally, oil-returning does not
go smoothly.
(2) Air temperature too low, engine-oil
viscosity too higher.
3. Rocker arm cannot be added engine-oil.
(1) Upper cylinder-head oil-passage and
oil-hole at support bottom of rocker arm shaft
are clogged.
1. Black smoke emitted in exhaust gas
(1) Oil injector is clogged with accumulated
soot, and needle valve is clogged.
(2) Load is too much.
(3) Fuel injecting is too late, and partial fuel is
burned during the course of exhaustion.
(4) Incorrect valve clearance; valve sealed
poorly.
(5) For each cylinder, fuel supply by
fuel-injection pump is not uniform and even.
(6) Intake pipe, air filter clogged, and air-intake
is not smooth.
2. White smoke emitted in exhaust gas
(1) Fuel-injecting pressure
atomization is poor; fuel dripping.
II. Abnormal engine-oil pressure
(1) Add the oil; change the oil.
(2) Weld, tighten or replace it.
(3) Replace it.
(4) Return it to factory for repair; replace it.
(5) Replace it.
(6) Inspect, adjust or replace it.
(7) Inspect it; block it.
(1) Inspect and adjust it.
(2) Use engine-oil with brand specified;
decrease is possible after the engine is
warmed up.
(1) Clean and make it unclogged.
III. Smoke emitted in exhaust gas
(1) Inspect, repair or replace it.
(2) Adjust the load to the range specified.
(3) Adjust the fuel-supply advance angle of
fuel-injection pump.
(4) Inspect the valve clearance and sealing
surface and spring force etc, and eliminate
the problems.
(5) Adjust fuel supply amount for each
cylinder.
(6) Dismantle and clean the filter.
is too low; (1) Inspect, adjust, repair or replace the fuel
nozzle couple.
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Remedial methods