B18C oil pump applies to Acura Integra 1994-2001 GSR models.
A rotor-type oil pump draws oil from oil pan and delivers it under pressure to main and connecting rod bearings. Oil jets at bottom of block spray oil upward to lubricate piston and cylinder wall. An oil passage carries oil to camshaft and rocker arms. Oil spray lubricates valve stems.
Crankcase Capacity
Crankcase capacity is 4.2 qts. (4.0L) including oil filter. Oil capacity is 5.1 qts. (4.8L) after engine overhaul.
Oil Pressure
Oil pressure at idle should be 10 psi (0.7 kg/cm2 ) minimum. Oil pressure at 3000 RPM should be 50 psi (3.5 kg/cm2 ) minimum.
Oil Pump Removal and Disassembly
Remove oil pan. Remove oil screen and oil pump assembly. Remove screws from oil pump housing. Separate housing and cover.
Inspection
Measure radial clearance between inner and outer rotors. Measure axial clearance between housing and outer rotor. Inspect both rotors and pump housing for scoring or other damage. Replace components if clearance measurements are not within specification.
B18C Oil Pump Specifications – In. (mm)
- Inner Rotor-To-Outer Rotor
- Radial Clearance
- Standard (New): 0.002-0.006 (0.05-0.15)
- Service Limit: 0.008 (0.20)
- Radial Clearance
- Housing-To-Outer Rotor
- Axial Clearance
- Standard (New): 0.001-0.003 (0.02-0.08)
- Service Limit: 0.006 (0.15)
- Radial Clearance
- Standard (New): 0.004-0.007 (0.10-0.18)
- Service Limit: 0.008 (0.20)
- Axial Clearance
Reassembly and Installation
- Reassemble oil pump, using Loctite on pump housing screws. Ensure oil pump turns freely. Install dowel pins and NEW “O” ring into cylinder block. Clean oil pump mating surfaces. Apply Liquid Sealant (08718-0001) to cylinder block mating surface of oil pump.
- Apply sealant to threads of inner bolt holes. Install oil screen and oil pump before sealant dries. Wait at least 30 minutes before filling crankcase with oil. To complete installation, reverse removal procedure.
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