Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1502
LUBRICATION
DESCRIPTION
The lubrication system is a full-flow filtration, pressure feed type. The oil pump body is mounted to the engine block.
The pump inner rotor is driven by the crankshaft. A windage tray is used to increase power by minimizing oil wind-
age at high engine RPM. An engine oil cooler is used on some models.
OPERATION
Oil from the oil pan is pumped by a geroter type oil
pump (3) directly coupled to the crankshaft. Oil pres-
sure is controlled by a relief valve mounted inside the
oil pump housing. Refer to Cylinder Block, Left Cylin-
der Head or Right Cylinder Head art between the
charts for engine oil lubrication circuits.
FROM:
TO:
FROM:
TO:
Oil Pump
Oil Filter Mounting (inlet)
Main Oil Gallery - Center
of Block
1. Crankshaft Main
Bearings
Oil Filter Mounting (inlet)
Oil Filter
2. Left Cylinder Head*
Oil Filter
Oil Filter Mounting (outlet)
3. Right Cylinder Head*
Oil Filter Mounting (outlet)
Oil Gallery - Right side of
Block
Crankshaft Main Bearings
Connecting Rod Bearings
Oil Gallery - Right side of
Block
Oil Gallery - Rear of Block
and to Oil Cooler (some
models)
Left Cylinder Head
Refer to Left Cylinder
Head Art
Oil Gallery - Rear of Block
Main Oil Gallery - Center
of Block
Right Cylinder Head
Refer to Right Cylinder
Head Art
*The cylinder head gaskets have an oil restrictor to control oil flow to the cylinder heads.
9 - 2032
ENGINE - 2.7L DOHC - SERVICE INFORMATION
LX
FROM:
TO:
Left Cylinder Head Oil Inlet Gallery (intake side of
head)
Oil Gallery and Accumulator – Rear of Head*
Oil Gallery and Accumulator – Rear of Head*
1. Exhaust Camshaft Oil Passage
2. Intake Camshaft Oil Passage
Left Exhaust Camshaft Oil Passage
1. Left Exhaust Camshaft Journals
2. Hydraulic Valve Lash Adjusters and Rocker Arms
3. Left Camshaft (Secondary) Chain Tensioner**
Left Intake Camshaft Oil Passage
1. Left Intake Camshaft Journals
2. Hydraulic Valve Lash Adjusters and Rocker Arms
* When oil reaches the back of the cylinder head, the oil gallery feeds oil into an accumulator chamber that is
located towards center of the head. The accumulator chamber is closed off with a pressed in core plug that has a
small orifice to act as a vent. Oil then travels down at a 45 degree angle from the accumulator into two passages,
one for the intake and one for the exhaust side of the cylinder head.
** The secondary camshaft chain tensioner is the last component to receive oil on the left cylinder head.
LX
ENGINE - 2.7L DOHC - SERVICE INFORMATION
9 - 2033
FROM:
TO:
Right Cylinder Head Oil Inlet Gallery (intake side of
head)
Oil Gallery and Accumulator – Rear of Head*
Oil Gallery and Accumulator – Rear of Head*
1. Exhaust Camshaft Oil Passage
2. Intake Camshaft Oil Passage
Right Exhaust Camshaft Oil Passage
1. Right Exhaust Camshaft Journals
2. Hydraulic Valve Lash Adjusters and Rocker Arms
3. Right Camshaft (Secondary) Chain Tensioner
4. Primary Timing Chain Tensioner - Right Head**
Right Intake Camshaft Oil Passage
1. Right Intake Camshaft Journals
2. Hydraulic Valve Lash Adjusters and Rocker Arms
* When oil reaches the back of the cylinder head, the oil gallery feeds oil into an accumulator chamber that is
located towards center of the head. The accumulator chamber is closed off with a pressed in core plug that has a
small orifice to act as a vent. Oil then travels down at a 45 degree angle from the accumulator into two passages,
one for the intake and one for the exhaust side of the cylinder head.
** The timing (primary) chain tensioner is the last component to receive oil on the right cylinder head.
9 - 2034
ENGINE - 2.7L DOHC - SERVICE INFORMATION
LX
DIAGNOSIS AND TESTING
CHECKING ENGINE OIL PRESSURE
1. Remove the oil pressure switch (1) (Refer to 9 -
ENGINE/LUBRICATION/OIL
PRESSURE
SEN-
SOR/SWITCH - REMOVAL).
2. Install oil pressure test gauge assembly, Special
Tools C-3292 with 8406 adaptor.
3. Start engine and monitor gauge readings.
CAUTION: If oil pressure is 0 at idle, Do not run
engine at 3000 RPM.
4. Oil Pressure (engine at operating temperature):
Curb Idle 34.5 kPa (5 psi) minimum 3000 RPM
300–724 kPa (45–105 psi).
5. If oil pressure is 0 at idle. shut off engine, check for
pressure relief valve stuck open or a clogged oil
pickup screen.
6. Remove oil pressure test gauge assembly, Special
Tools C-3292 with 8406 adaptor and install oil pres-
sure switch after testing is completed (Refer to 9 -
ENGINE/LUBRICATION/OIL PRESSURE SENSOR/SWITCH - INSTALLATION).
LX
ENGINE - 2.7L DOHC - SERVICE INFORMATION
9 - 2035
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