Chevrolet Performance LT4 Instructions De Montage page 6

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. Then the
oil moves to the upper main oil galleries and the valve lifter manifold assembly. Oil from the left upper oil gallery is directed to
the crankshaft and camshaft bearings. Oil that has entered both the upper main oil galleries also pressurizes the valve lifter
assemblies and is then pumped through the pushrods to lubricate the valve rocker arms and valve stems. Oil returning to the
pan is directed by the crankshaft oil deflector. The oil pressure sensor is located at the top front of the engine.
An oil passage at camshaft bearing location 2 permits oil flow into the center of the camshaft. Oil enters the camshaft exiting
at the front and into the camshaft position (CMP) actuator solenoid valve. The CMP valve spool position is controlled by the
engine control module (ECM) and CMP magnet. When commanded by the ECM, the CMP magnet repositions the CMP
actuator solenoid valve spool directing pressurized oil into the CMP actuator to control valve timing.
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. The coolant is then forced through the
cylinder head gasket openings and into the cylinder heads. In the cylinder heads, the coolant flows through the water jackets
surrounding the combustion chambers and valve seats, where it absorbs additional heat. From the cylinder heads, the coolant
is then forced to the thermostat. The flow of coolant will either be stopped at the thermostat until the engine is warmed, or it will
flow through the thermostat and into the radiator where it is cooled and the coolant cycle is completed.
The cylinder head air bleed needs to be routed to the highest point in the cooling system. This will assist in removing air from
the cylinder heads (Figure. 5).
Fig. 5
PUMP OUTLET
LT4 Wet Sump 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.
CYLINDER HEAD AIR BLEED
PUMP INLET
19332622
IR 02JA18
PART NO.
DATE
17AU15 Initial Release - Rocko Parker
02JA18 Revision - Rocko Parker
6
SHEET
REVISION
35
OF
AUTH
ECA P5E00313
N/A