805402 Mercruiser NUT

1. Remove three bolts and locks and remove suction bell and tube (1) from oil pump. 2. Remove bolts (2) that hold the elbow and tube assembly to the back of the oil pump.
The oil pump idler gear can fall off the pump when the pump is removed. To prevent injury, always hold the gear on the pump when the pump is removed.
3. Remove four bolts (3) and two locks. Remove the oil pump (4) from the engine. The following steps are for the installation of the oil pump.4. Put oil pump (4) in position and install the bolts and locks that hold it.5. Install the bolts that hold the elbow and tube assembly to the oil pump.6. Install suction bell and tube assembly (1).End By:a. install oil panDisassemble Oil Pump
Start By:a. remove oil pump 1. Remove idler gear (2). Remove the bearing from the idler gear with tooling (B).2. Remove suction bell (1).3. Remove the bolt and the washer from the oil pump drive gear. 4. Remove the drive gear from the shaft with tooling (A).5. Remove the key from the pump shaft.6. Remove bolts (3) from the pump body. 7. Remove body (8), two gears (7), the keys and spacer (4) from the pump.8. Remove two shafts (5) and the gears.9. Remove bolts (6), the cover and the pressure relief valve from the body. 10. Remove the bearings from the oil pump body assembly and the scavenge pump body assembly with tooling (B).Assemble Oil Pump
1. Install the bearings in the scavenge pump body assembly with tooling (B) and a press as follows:a. Put bearings (9) in position on the inside of the scavenge pump body assembly with the chamfer on the bearing toward the outside of the pump body. Install the bearing until it is 1.52 mm (.060 in.) below the inside machined surface of the scavenge pump body assembly. Make sure the joints in the bearings are at an angle of 30° 15° from the center line through the bores in the scavenge pump body and toward the outlet passage of the pump. The outlet passage has a cavity between the bearing bores. 2. Install the bearings in oil pump body assembly with tooling (B) and a press as follows.a. Put bearings (10) in position on the inside of the oil pump body assembly with the chamfer on the bearings toward the outside of the pump body. Install the bearings until they are even with the outside of the pump at an angle of 30° 15° from the centerline through the bearing bores and toward the outlet passage of the pump. The outlet passage has a cavity between the bearing bores.3. Check the condition of the relief valve. Check the condition and specifications for all the parts of the oil pump before it is assembled. See the topic, Oil Pump in the Specifications module.4. Put clean engine oil on all the parts of the oil pump. 5. Install pressure relief valve (11) cover (12) and bolt (5) in the oil pump body assembly. 6. Install shaft assemblies (13) in the oil pump body assembly.7. Install spacer (4). Install the key in the shaft assembly.8. Install the two gears on the shaft assemblies. 9. Install scavenge pump body assembly (14) and the bolts that hold it.10. Install key (15), drive gear (16), the washer and bolt (17). Tighten the bolt to a torque of 43 7 N m (32 5 lb.ft.).11. Install the bearing in the idler gear with tooling (B) and a press until it is even with the outside surface of the gear.12. Install the suction bell on the oil pump. Install the idler gear on the oil pump.
The oil pump must turn freely by hand after it is assembled.
End By:a. install oil pump