Vedeneyev M-14P, Maintenance Manual

Page: 206 / 381

LUBRICATION - TROUBLE SHOOTING
For mostly often encountered troubles and their remedies, refer to the Table given below.
Trouble Possible cause Correction
1.Low oil
pressure
(1) Air lock in line for supply of
oil to oil pump, thickened oil (in winter),
clogged oil tank vent pipe
(2) Faulty pressure gauge or its
wires
(3) Maladjusted reducing valve
of oil pump
(4) Oil is excessively thinned
by gasoline
(5) Clogged filters in line from
tank to engine
(6) Jammed reducing valve,
clogged valve
(7) Foaming of oil
Eliminate air lock, heat oil line and oil,
clean oil tank vent pipe
Replace pressure gauge, check wiring
Adjust pressure by reducing valve
(Ref. Task Card Ho. 204)
Change oil and check that dilution
cock is not leaky (Ref. 072.00.00, Task Card
Mo. 244)
Check lines, wash filters (Ref.
072.00.00, Task Card No. 249)
Remove and disassemble oil pump
reducing valve as follows: Unlock and undo
cap of adjustment screw (Ref. Pig. 3). blacken
adjustment screw look nut. Drive out
adjustment screw with screwdriver. Drive out
reducing valve body and remove valve and
spring. Wash removed parts in clean gasoline
and blow with dry compressed air. Reinstall
spring and valve and drive home reducing
valve body. Screw on lock nut. Adjust oil
pressure (Ref. Task Card Mo. 204)
V/ash and check oil system, change
oil (Ref. 072.00.00, Task Card Mo. 244)
Trouble Possible cause Correction
2. Filter with
chip detector warning
lamp comes up
(8) Low oil level in oil tank (1)
Metal chips in filter
(2) Faulty circuit (3) Water in
oil
Add oil to oil tank to required level
Detect cause of chips in oil and.
together with Supplier's representative take
decision on withdrawal of engine from service
Test circuit for continuity (Ref.
072.00.00, Task Card Ho. 226)
Change oil (Ref. 072.00.00, Task Card
No. 244)