Overhauling the S2000 F20C oil pump applies to 1999-2003 models.
Removal
1. Remove the cam chain
2. Remove the oil pump chain tensioner.
3. Remove the baffle plate.
4. Remove the three bolts securing the oil pump.
5. Remove the oil pump oil pump chain, and crankshaft sprocket.
6. Inspection : Remove the pump cover.
7. Check the inner-to-outer rotor radial clearance between the inner rotor and outer rotor. If the inner-to-outer rotor radial clearance exceeds the service limit, replace the outer rotor and oil pump housing.
- Inner Rotor-to-Outer Rotor Radial Clearance Standard (New): 0.02-0.15 mm (0.001-0.006 in.)
- Service Limit: 0.20 mm (0.008 in.)
8. Check the housing-to-rotor axial clearance between the rotor and pump housing. If the housingto-rotor axial clearance exceeds the service limit, replace the outer rotor and oil pump housing.
Housing-to-Rotor Axial Clearance
- Standard (New): 0.02-0.07 mm (0.001-0.003 in.)
- Service Limit: 0.12 mm (0.005 in.)
9. Check the housing-to-outer rotor radial clearance between the outer rotor and pump housing. If the housing-to-outer rotor radial clearance exceeds the service limit, replace the outer rotor and oil pump housing.
Housing-to-Outer Rotor Radial Clearance
- Standard (New): 0.15-0.21 mm (0.006-0.008 in.)
- Service Limit: 0.23 mm (0.009 in.)
10. Inspect both rotors and the pump housing for scoring or other damage. Replace parts, if necessary.
Installation
11. Squeeze the new oil pump chain tensionerthen install the set clip on it as shown. The set clip is supplied with the oil pump chain tensioner.
12. Install the crankshaft sprocketoil pump chain, and oil pump.
13. Tighten the bolts on the oil pump.
14. Install the baffle plate.
15. Set the crankshaft sprocket so that the No. 1 piston is at top dead center (TDC). Align the key on the sprocket and crankshaft with the pointer on the cylinder block.
16. Move the cam chain so that the colored piece aligns with the punched mark on the crankshaft sprocket.
17. Install the oil pump chain guide and oil pump chain tensioner.
18. Remove the set clip from the oil pump chain tensioner.
19. Install the cam chain
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