These procedures are performed with the oil pump removed from the engine.
1984-87 Prelude, 1984-89 Accord
1. Check the rotor radial clearance for both the inner and outer rotors. Clearance is 0.15-0.20 mm.
2. Using a feeler gauge, check the housing-rotor gap of both rotors. The gap is 0.10-18 mm for new ones; 0.20 mm - service limit.
3. Using a feeler gauge and straightedge, check the rotor end play between the rotor surface and the gasket surface, with the gasket installed. Play should be 0.025-0.10 mm on new ones, with a service limit of 0.15 mm.
4. When replacing the rotors, internal and external, on both the upper and lower halves of the housing, the stamped marks must be aligned.
5. Install new oil seals and O-rings on the housing halves. Use an oil seal installation tool of the correct diameter to install the shaft seal; gently move the seal until the installation device touches the cover.
6. Assemble the pump. Use thread sealant for the small screws of the pump body. Tighten them only to 7 Nm.
1988-91 Prelude, 1990-91 Accord
1. With the oil pump removed, separate the housing and cover by removing the eight bolts.
2. Check the radial clearance between the inner and outer rotors of the pump. Standards for a new Accord pump are 0.02-0.16 mm and Prelude 0.04-0.16 mm. The absolute wear limit for each is 0.2 mm.
3. Check the axial clearance between the pump body and the outer rotor. Use an accurate ruler, placing it across the body. The standard clearance is 0.02-0.07 mm; absolute wear limit 0.12 mm.
4. Check the radial clearance between the housing and the outer rotor, the standard clearance is 0.1-0.19 mm with a wear limit of 0.21 mm.
5. Visually inspect both rotors for cracking or scoring, replace if necessary.
6. Remove the oil seal from the shaft. Install a new one using an oil seal installer of the correct diameter, gently press the seal into place until the installer contacts the housing.
7. Assemble the pump. Use thread sealant for the bolts and tighten them to 7 Nm. Check that the oil pump rotates freely.
8. Install the oil pump.
(The text was taken from the website «www.hondabook.ru»)