Intermediate shaft engines
Removing
1. Remove the pallet (refer to 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).
3a. 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.
3b. Remove the drive gear from the block (refer to illustrations). Discard the O-ring.
Inspection
1. Turn away bolts of fastening and remove a cover of the pump.
2. Get an intermediate gear wheel/shaft. Mark the intermediate gear so that it can be installed in the same position (refer to accompanying illustration).
3. Remove the mounting bracket and remove the support cup, spring, spring seat, and oil pressure reducing valve plunger.
4. Clean components and carefully inspect gears, pump housing and plunger for nicks and signs of wear. Replace the pump assembly if there is excessive wear.
5a. If the components are serviceable, use a feeler gauge to measure the clearance between the pump housing and the gears.
5b. Also measure the axial clearance of the gears and check the flatness of the end cap (refer to illustrations). If the clearances exceed those specified in Specifications tolerances, the pump must be replaced.
6. If the pump is OK, reassemble all components in the reverse order of removal. Fill the pump with oil, then install the cover and tighten the bolts securely. Prime the pump by immersing it in a container of oil and rotating the drive shaft.
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. Engage the pump drive shaft with 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 sump, 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 sprocket 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 above.
Inspection
1. Proceed as described in Inspection for COUNTER SHAFT MOTORS.
Installation
2. Wipe the contact surfaces of the oil pump and cylinder block.
3. 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.
4. Put the chain on the sprockets (if deleted), then install both sprockets and chain onto the crankshaft and onto the oil pump hub.
5. Align the holes, then insert the bolts and tighten them while holding the sprocket stationary with a screwdriver.
6. 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).