Chevrolet LT1 E-ROD Hoja De Instrucciones página 6

Engine Oil Pump System
Engine lubrication is supplied by a variable displacement two-stage vane-type oil pump assembly. An oil control solenoid valve, controlled by the ECM,
mounted to the oil pump provides two stage functionalities. The oil pump is mounted on the front of the engine block and driven directly by the
crankshaft sprocket. The pump rotor and vanes rotate and draw oil from the oil pan sump through a pick-up screen and pipe. The oil is pressurized as it
passes through the pump and is sent through the engine block oil galleries. The variable pressure/flow oil pump must be controlled by the ECM in order
to maintain proper lubrication and minimize excessive oil delivery to the cylinder heads and PCV system. There are several devices on the LT1 that use oil
pressure to maintain proper functionality. The ECM controls engine oil pressure and flow for oil spray piston cooling, variable valve timing, cylinder
deactivation along with crankshaft and camshaft bearing cooling. The default mode for the oil pump is high flow and high pressure. This can lead to
excessive oil consumption thru the PCV system.
The LT1 Gen-V engine feature oil-spray piston cooling, in which eight oil-spraying jets in the engine block drench the underside of each piston and the
surrounding cylinder wall with an extra layer of cooling, friction-reducing oil. The oil spray reduces piston temperature, promoting extreme output and
long-term durability. The extra layer of oil on the cylinder walls and wristpin also dampens noise originating from the pistons.
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 has 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.
Caution: Never block off the heater ports at the coolant pump. If no heater is desired, loop the inlet port to the outlet
port at the coolant pump. If blocked, the system will not operate properly and overheating of the engine will occur.
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.
PUMP OUTLET
PUMP INLET
LT1 E-ROD Instruction Sheet
ALL INFORMATION WITHIN ABOVE
Date
BORDER TO BE PRINTED EXACTLY
20MY19
AS SHOWN ON 8.5 x 11 WHITE 16
POUND NON-BOND RECYCLABLE
03OC19
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
UNITIZED IN ACCORDANCE WITH
GMCCA SPECIFICATIONS.
CYLINDER HEAD AIR BLEED
Rev 03OC19
Revision Auth
Init Rel – Blake Nye
NA
Rev – Blake Nye
NA
(SMALL PIPE)
PART No.
19418603
DR
Installation Instructions
Title
19418603
PART No.
SHEET
6 of 69
LT1 E-ROD
SHEET 6 of 69