GENERAL MOTOR DIESEL LOCOMOTIVE. Manual - part 10

IRCAMTECH/2006/M/D/GM loco/1.0

Introduction hand book on GM locomotive February 2006

LUBE OIL SYSTEM

The complete engine lubricating oil system is a

combination of 04 oil systems. These are:

(1)  Scavenging oil system
(2)  Main lubricating oil system
(3)  Piston cooling oil system
(4)  Soak Back or turbo lube system

Lube oil pumps

• Each system has its own lube oil pump.

• The main lube oil pump, piston cooling oil pump

and scavenging oil pumps are driven from the
accessory gear train at the front end of the engine.

• The soak back or turbo lube system is driven by a

electric motor.

• The main lube oil pump and piston cooling oil pump

is a individual pump but both contained in one
housing and driven from a common drive shaft.

1.Scavenging Oil System

The scavenging oil pump is a positive displacement,

helical gear type pump. This pump takes lube oil from 02
sources- from the engine oil sump and from the oil strainer.

The pump feed lube oil to lube oil filter tank (also

called Michiana oil filter). Oil from the filter tank gose to lube oil
cooler where it is cooled by the engine cooling system. Oil
then passes to lube oil strainer where it is filtered once again.

The oil filter (Michiana oil filter) contain 5 paper type

filter elements. A bypass valve provided across the filter tank
and set at 40 PSI. If the filter is clogged and pressure
difference reaches to 40 PSI oil is bye passed to lube oil
cooler. This ensures adequate lube oil supply to the engine
avoiding damages to the moving parts.

The oil filter and the lube oil cooler are located in the

equipment rake.

IRCAMTECH/2006/M/D/GM loco/1.0

Introduction hand book on GM locomotive February 2006

The lube oil strainer is having 02 fine mesh strainer

elements.

2.Piston Cooling Oil System

There is a suction pipe (coming from the lube oil

strainer) for the piston cooling oil system and the main lube oil
system. The piston cooling oil system pump receives oil from a
common suction pipe and delivers oil to the 2 piston cooling oil
manifolds extending the full length of the engine, one on each
bank. A piston cooling oil pipe at each cylinder directs a
stream of oil to cool the underside of the piston crown. This
stream of oil also lubricate the ring belt. Some of this oil enters
oil grooves in the piston pin bearing for lubrication. Oil after
cooling and lubrication drains back in to the oil sump.

3.Main Lubricating Oil System

The main lubricating oil system supplies oil under

pressure to most of the moving parts of the engine. The main
lube oil pump takes oil from the strainer housing through a
common suction. Oil from the pump goes to the main oil
manifold, which is located above the crankshaft, extends to the
length of the engine. Maximum oil pressure in the system is
control by a relief valve in the passage between the pump and
the main oil manifold. The pressure relief valve is set to
125PSI, which relives excess oil back to the sump.

Oil tubes in the centre of the each main bearing

receives oil from the main manifold to the upper half of the
crankshaft main bearings. Drilled passage in the crankshaft
supplies oil to the connecting rod bearings, vibration damper
and accessory drive gear at the front end of the crankshaft. Oil
from the manifold enters gear train at the rear end of the
engine at the idler gear stub shaft. Oil passes in the base of
the stub shaft from where oil is distributed to various parts
through passage. One passage conducts oil to the left bank
camshaft drive gear stub shaft bracket through a jumper.
Another passage conducts oil to the Right Bank camshaft

IRCAMTECH/2006/M/D/GM loco/1.0

Introduction hand book on GM locomotive February 2006

drive stub shaft bracket and the turbo charger oil filter supply
line.

Oil enters the hollow bore camshaft from the camshaft

stub shafts. Radial holes in the camshafts conducts oil to each
camshaft bearing. An oil line from each camshaft bearing at
each cylinder supplies oil to the rocker arm shaft, rocker arm
cam follower assemblies, hydraulic lash adjusters and to
rocker arm. Leaks of oil return to the sump.

LINE DIAGRAM OF LUBE OIL SYSTEM

The turbo charger oil filter supply line sands oil to the

turbo lube oil filter which sands oil to the turbo oil manifold and
then to turbo for cooling and lubrication. A branch line taken to
the wood word governor low lube oil pressure shut down

IRCAMTECH/2006/M/D/GM loco/1.0

Introduction hand book on GM locomotive February 2006

device and also to the hot oil detector. The minimum oil
pressure is approximately 8-12 PSI at idle and 25-29 PSI at
full speed. In the event of insufficient oil pressure, a shutdown
feature in the governor will automatically protect the engine by
shutting down.

The turbo charger oil filter provides additional

protection for the high-speed bearing and other lubricated
areas of the turbo. The filter heads contains 2 check valves,
one to prevent the lube oil from the soak back system from
going into the turbo charger filter during soak back pump
operation and the other to prevent lube oil from the turbo
charger filter from entering the soak back system when the
engine is running. Passages in the turbo charger conducts oil
to the turbo bearings, idler gear, planet gear assembly and
auxiliary drive bore.

4.Soak Back Oil System: -

To ensure lubrication of the turbo charger prior to the

engine start and the removal of residual heat from the turbo
after engine shutdown, a separate lube oil pressure source is
provided. This pressure system is controlled automatically by
the locomotive control system.

An electrically operated turbo soak back pump draws

oil from the oil sump, feed the oil through a soak back filter and
finally to the turbo. A 70-PSI soak back filter bypass valve is
provided inside the soak back filter housing to bypass filter
whenever it cloggs to protect Turbo-charger.

This soak back pump automatically starts working

before cranking the engine. When the engine start, the motor
driven soak back pump is still running, main lube oil pressure
from the engine driven pump becomes greater than the motor
driven soak back pump pressure. As there is no outlet for the
lower pressure oil, the relief valve is provided in the filter head
set to 32 PSI will return the oil back to engine sump.

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