Intermediate shaft engines
Removing
1. Remove the oil pan as described in Section Removal and installation of the pallet.
2. Remove the four pump mounting bolts and separate the pump from the cylinder block and drive gear (refer to accompanying illustration).
3. If necessary, remove the two mounting bolts and remove the oil pump drive gear cover and O-ring from the rear of the cylinder block. Remove the drive gear from the block. Discard the O-ring.
Inspection
1. Turn away bolts of fastening and remove a cover of the pump. Remove the intermediate gear and drive gear/shaft. Mark the intermediate gear so that it can be installed in the same position.
2. Remove the mounting bracket and remove the support cup, spring, spring seat, and oil pressure reducing valve plunger.
3. Clean the components, carefully inspect their condition. Replace the pump assembly if there is excessive wear (no spare parts for sale).
4a. If the components appear serviceable, measure the clearance between the pump housing and gears with feeler gauges.
4b. Also measure the end play of the gears and check the flatness of the end cap (refer to illustrations).
4c. If the clearances exceed those specified in Specifications tolerances, the pump must be replaced.
5. If the pump is in good condition, reassemble the components in reverse order of disassembly. Fill the pump with oil, then install the cover and tighten the bolts securely.
Installation
1. Where necessary, install the pump drive gear into the cylinder block, properly engaging it with the layshaft. Install the drive gear cover using a new O-ring and tighten the mounting bolts securely.
2. Wipe the mating surfaces of the oil pump and cylinder block.
3. Check that the locating pin is in the oil pump, then place the pump in the operating position. Hook the pump drive shaft into the drive gear slots. Install the pump mounting bolts and tighten them to the Specifications effort.
4. Install the pallet as described in Section Removal and installation of the pallet.
Engines without intermediate shaft
Removing
1. To remove only the oil pump, first remove the oil pan, refer to Section Removal and installation of the pallet.
2. Turn away two fixing bolts and get the oil pump, tilting it to disengage the cogwheel from the drive chain.
3. To remove the oil pump along with the drive chain and sprocket, first remove the sump (Chapter Removal and installation of the pallet), then unscrew the casing of the crankshaft oil seal from the side of the drive belt, as described in Section Replacement of crankshaft oil seals. Notice the chain guide and two dowel pins.
4. Remove the bolts securing the sprocket to the oil pump hub. Hold it with a screwdriver inserted through one of the holes.
5. Remove the drive sprocket from the crankshaft and the driven sprocket from the oil pump along with the chain. Please note that the drive gear does not have a key and is fixed to the crankshaft only with a bolt. Therefore, it is very important to properly tighten the pulley bolt, otherwise there is a possibility that the oil pump will not function.
6. Unscrew the oil pump as described in paragraph 2 above.
Inspection
1. Proceed as described in the inspection paragraphs for countershaft engines.
Installation
1. Wipe the contact surfaces of the oil pump and cylinder block.
2. Make sure the two dowel pins are in place in the cylinder block, then place the oil pump on them and insert the two mounting bolts. Tighten the bolts securely.
3. Put the chain on the gears (if deleted), then install both sprockets and chain onto the crankshaft and onto the oil pump hub.
4. Align the holes, then insert the bolts and tighten them while holding the sprocket stationary with a screwdriver.
5. Establish a casing of an epiploon as it is described in Section Replacement of crankshaft oil seals (don't forget the chain guide and two dowel pins) and pallet (follow Section Removal and installation of the pallet).