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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 engine main oil galleries.
The LT5 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.
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, when using specialized reservoir tank.
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.
Oil drain plugs
LT5 Dry Sump Engine Installation
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.
19417106
IR 03OC18
PART NO.
DATE
03OC18
Initial Release - Rocko Parker
8
SHEET
REVISION
36
OF
AUTH
N/A
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