(9) The relief valve spring has a free length of
approximately 49.5mm (1.95 inches) it should test
between 19.5 and 20.5 pounds when compressed to
34mm (1-11/32 inches). Replace spring that fails to
meet specifications (Fig. 5).
(10) If oil pressure is low and pump is within speci-
fications, inspect for worn engine bearings or other
reasons for oil pressure loss.
OIL PUMP ASSEMBLY AND INSTALLATION
(1) Assemble pump, using new parts as required.
Install the inner rotor with chamfer facing the
cast iron oil pump cover.
(2) Tighten cover screws to 12 NIm (105 in. lbs.).
(3) Prime oil pump before installation by filling rotor
cavity with engine oil.
(4) Install chain case cover slowly refer to Timing
Chain Cover Installation of this section.
CHECKING ENGINE OIL PRESSURE
Check oil pressure using gauge at oil pressure switch
location. Oil pressure should be 34 kPa ( 5 psi.) at idle
or 205 to 550 kPa (30 to 80 psi.) at 3000 RPM.
(1) Remove pressure sending unit and install oil
pressure gauge (Fig. 13).
CAUTION: If oil pressure is 0 at idle, Do Not Run
engine at 3000 RPM.
(2) Warm engine at high idle until thermostat opens.
OIL FILTER
When servicing oil filter avoid deforming the
filter can by installing the remove/install tool
band strap against the can to base lockseam. The
lockseam joining the can to the base is reinforced
by the base plate.
(1) Using Tool C-4065, unscrew filter from base and
discard (Fig. 14).
(2) Wipe base clean, then inspect gasket contact
surface.
(3) Lubricate gasket of new filter with clean engine
oil.
(4) Install and tighten filter to 20 NIm (15 ft. lbs.)
torque after gasket contacts base. Use filter wrench if
necessary.
(5) Start engine and check for leaks.
Fig. 11 Measuring Clearance Between Rotors
Fig. 12 Measuring Clearance Over Rotors
Fig. 13 Checking Oil Pump Pressure
Fig. 14 Oil Filter
9 - 32 3.3L ENGINE
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