Removal
On 2.0L turbo and 2.3L models, remove front cover, timing
belt and oil pump as outlined in TIMING BELT & SPROCKETS. On 1.9L
models, remove valve cover and distributor. Remove oil pan. Remove
oil pick-up tube from block, then remove tube from oil pump. Remove
oil pump.
Inspection
1) Measure tip clearance between inner and outer rotors.
Replace oil pump if clearance is greater than .008" (.20 mm). Measure
clearance between outer rotor and inner wall of pump housing. Replace
oil pump if clearance is greater than .016" (.41 mm) on 2.0L and 2.3L
models or .010" (.25 mm) on 1.9L models.
2) Install both gears in pump housing. Place a straightedge
over pump housing. Use a feeler gauge to measure rotor-to-pump cover
clearance. Replace oil pump if clearance is greater than .006" (.15
mm) on 2.0L and 2.3L models or .008" (.20 mm) on 1.9L models.
3) Inspect relief valve spring for wear, weakness or damage.
Check oil pump body, cover and drive gear for wear, cracking or
damage. If oil pump components exceed specifications, replace pump.
4) On 1.9L models, measure outside diameter of drive shaft
and inside diameter of shaft hole in pump cover. Compare measurements
to determine drive shaft clearance. Replace oil pump if clearance is
greater than .010" (.25 mm).
OIL PUMP SPECIFICATIONS TABLE
Application In. (mm)
Drive Shaft Clearance ...................... .0028-.0043 (.071-.109)
Rotor Tip Clearance
2.0L & 2.3L ........................................... .016 (.41)
1.9L ..................................... .0005-.0059 (.013-.150)
Rotor-to-Pump Housing
2.0L &2.3L ............................................ .006 (.15)
1.9L ..................................... .0063-.0087 (.160-.221)
Rotor-to-Pump Cover
2.0L & 2.3L ........................................... .006 (.15)
1.9L ..................................... .0012-.0035 (.030-.089)
Fig. 11: Exploded View of Oil Pump Assembly on 2.0L & 2.3L Models
Courtesy of Isuzu Motor Co.
Installation
1) On 2.0L and 2.3L models, follow installation procedures
