Chevrolet Performance LT1 Mode D'emploi page 4

Engine Oil Pump - Dry Sump Oiling
Engine lubrication is supplied by a two-stage oil pump assembly. The oil pump assembly consists of a primary vane-type
variable displacement pump and a secondary geroter-style pump. The primary pump contains a pressure relief valve that
protects the oil pan mounted oil filter from over pressurization during cold engine start up. If system pressure exceeds
600 kPa (87 psi), the pressure relief valve will open and exhaust oil back into the oil pan. The front or forward gear set is the
secondary pump. The rear or rearward housing contains the primary pump. The pump assembly is mounted at the front of the
engine and driven directly by the crankshaft sprocket. The vanes of the primary pump rotate clockwise and draw oil from the
engine oil tank through the oil tank screen. The oil is pressurized as it passes through the primary pump and is sent through
the engine block lower oil gallery.
Pressurized oil is directed through the engine block lower oil gallery to the full flow oil filter where harmful contaminants are
removed. A bypass valve is incorporated into the oil filter, which permits oil flow in the event the filter becomes restricted.
Oil exits the oil filter and is then directed to the external oil cooler. The external oil cooler is a liquid to liquid (engine coolant to
oil) oil cooler and consists of an oil pan mounted core and coolant lines that connect the oil cooler to the engine cooling circuit.
A bypass valve is incorporated into the oil cooler assembly in the event oil flow within the cooler is restricted. Oil returns from
the oil cooler and is directed to the upper main oil galleries.
The oil tank inlet port is used to supply scavenged oil from the engine to the storage tank. The oil tank outlet port is used to
supply non-aerated oil from the storage tank to the engine. Chevrolet Performance parts oil adaptor kit part number 25534412
can be used to convert to AN-12 fittings.
Oil tank outlet port
When replacing engine oil, there are two oil drain plugs within the oil pan. One plug drains the oil pan and the other plug
drains the storage tank.
Powertrain Cooling
Coolant Type
40/60 coolant/water mixture of clean, drinkable water and use only DEX-COOL® Coolant.
Engine Cooling System
A surge tank is recommended for removing air from the engine coolant, but as long as the radiator or surge tank is the highest
point in the system, then air will be evacuated from the coolant. The highest point, meaning that either the radiator or the surge
tank have a portion higher than the top of the cylinder heads. If they are not, then air can be trapped within the cylinder heads
and cause portions of the cylinder heads to overheat, which will be detrimental to engine performance and longevity.
Coolant is drawn from the radiator outlet and into the water pump inlet by the water pump. Some coolant will then be pumped
from the water pump, to the heater core, then back to the water pump. This provides the passenger compartment with heat
and defrost.
Coolant is also pumped through the water pump outlet and into the engine block. In the engine block, the coolant circulates
through the water jackets surrounding the cylinders where it absorbs heat.
Performance Parts LT1 Engine
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GM SPECIFICATIONS.
Dry sump oil pan (LT1)
Front
Oil tank inlet port
19328729
PART NO.
DATE
03JN14 Initial Release - Rocko Parker
13MY16 Revision - Rocko Parker
4
SHEET
REVISION
33
OF
AUTH
N/A
N/A