Technical data

17
1.2.2.5.2. Fuel Pump
The D-243 diesel engine and its modifications are equipped with the high-pressure fuel
pump 4UTNI and the D-245 engine and its modifications – with the pumps 4UTNI-T or
4UTNM-T.
All the pump models are driven from the engine crankshaft via timing gears. The fuel
pumps are equipped with all-mode governors and piston-type priming pumps.
The pump governor contains the fuel feed corrector, automatic fuel feed intensifier (for
starting the engine) and, in the 4UTNI-T and 4UTNM-T pumps there is also the pneumatic
smoke restrictor (pneumatic corrector).
The fuel-priming pump is mounted on the housing of the high-pressure pump and driven
by the eccentric of the camshaft.
The working parts of the fuel pumps are lubricated with flowing oil coming from the en-
gine lubricating system into the pump housing through the special hole in the flange. The oil is
drained from the pump into the engine pan through the special channel in the flange.
When mounting a new or repaired pump onto the engine, it is necessary to fill it with
200...250 cm
3
(0.42-0.53 pt liq US) of engine lubrication oil through the oil filler hole in the regu-
lator cover.
1.2.2.5.3. Fuel Injector
The fuel injector is intended for spraying the fuel into the engine cylinder. It ensures the
necessary atomisation of fuel and restricts the beginning and end of the feed. The diesels are
equipped with fuels injector fitted with closed-type five-hole atomizers 17.1112010-01 (manufac-
tured by the “KA” Joint-Stock Company) or 171.1112010-01 (manufactured by the “AZPI”
Closed Joint-Stock Company).
The fuel injector 17.1112010-01 (the “KA” Joint-Stock Company) has the marking
"171", 171.1112010-01 (manufactured by the “AZPI” Closed Joint-Stock Company) – “171-01”
while the fuel injector atomizer has the marking “17”. The marking is stamped on the fuel injector
housing and on the atomizer body.
1.2.2.5.4. Course Fuel Filter
The course fuel filter serves for the preliminary purification of fuel by removing mechani-
cal contaminants and water.
The course fuel filter consists of the housing, slinger with the screen element, diffuser
and cup with a damper.
The fuel sediment shall be drained out from the hole in the sleeve bottom to be closed
with a plug.
1.2.2.5.5. Fine Fuel Filter
The fine fuel filter is intended for final purification of fuel.
The fine fuel filter has a replaceable paper element.
When passing through the blinds of the paper filter element, the fuel becomes free of me-
chanical contaminations. In the lower portion of the filter housing there is a hole for draining the
sediment with a plug.
There is a vent plug on the filter cover for bleeding air from the fuel system.