Contents: Removal ↓ Installation ↓
Removal
1. Contact paragraphs 1-18 of section 6 and remove the timing chain and crankshaft sprocket.
2. Remove the chain and sprockets of the oil pump drive: turn the engine 90° (¼ turn) counterclockwise (from TDC position) so as to bring the crankshaft key into a horizontal position. Then unscrew the bolt and remove the oil pump drive chain tensioner (fig. 14.2, a, b).
Fig. 14.2, a. Bring the crankshaft spline to the left horizontal position (A). Then unscrew the bolt (B) and remove the oil pump drive chain tensioner
Fig. 14.2, b. Using a screwdriver, lock the lower sprocket, loosen the bolt and remove the drive chain and lower sprocket from the engine
3. Remove the three bolts and disconnect the oil pump housing from the engine (Fig. 14.3). To remove the pump, you may need to insert a screwdriver between the front of the block and the pump housing and pry the pump off.
(The original text is posted on: ToyotaMan)
Fig. 14.3. Oil pump mounting bolts
4. Use a scraper to remove all traces of sealant and old gasket material from the pump housing and cylinder block, then clean the mating surfaces with lacquer thinner or acetone.
5. Inspect the oil pump and chain for wear and damage. If the oil pump shows signs of wear or you are unsure about its condition, it is recommended to replace it. Inspect the oil pump drive chain for wear or scratches. Replace if necessary. Place the chain on each of the oil pump drive sprockets and measure the diameter of the sprockets across the chain rollers (fig. 6.21, b). If the obtained dimension is less than the prescribed minimum sprocket diameter, the chain and sprockets should be replaced. The wear of the oil pump drive chain guide is measured from the upper plane of the chain contact surface to the base of the wear grooves (fig. 6.22). Also check the oil nozzle for blockage - its blockage will lead to increased wear of the timing chain, oil pump drive chain and guides (Fig. 14.5).
Fig. 14.5. Make sure that the oil nozzle is not clogged with dirt
Installation
6. Lubricate the pump cavities by pouring a small amount of clean engine oil into the inlet port of the oil pump and turning the pump by the shaft of a suitable sprocket.
7. Install the oil pump and new gasket onto the cylinder block and tighten the corresponding bolts.
8. Tighten the bolts in several stages to the specified torque specified in Specifications at the beginning of this chapter. To avoid deformation of the body, work in a crosswise sequence.
9. Making sure that the crankshaft key is still in the left horizontal position and the flat on the oil pump drive shaft is facing up, install the chain and drive sprockets so that the coloured links of the chain are aligned with the timing marks on the sprockets (Fig. 14.9).
Fig. 14.9. Install the oil pump drive chain so that the colored links are aligned with the marks on the sprockets
10. Tighten the lower drive sprocket mounting bolt to the specified torque as shown in Specifications at the beginning of this chapter.
11. Reinstall the remaining components in the reverse order of removal.
12. Add oil to the correct level and start the engine. Check for proper oil pressure and check for leaks.