805979 Mercruiser NUT, (.375-24), Flange

Table 1
Required Tools
Tool Part Number Part Description Qty
A 9U-6198 Crankshaft Turning Tool 1 Start By:
Remove the engine oil pump. Refer to Disassembly and Assembly, "Engine Oil Pump - Remove" for the correct procedure.
Remove the crankshaft rear seal. Refer to Disassembly and Assembly, "Crankshaft Rear Seal - Remove" for the correct procedure.
This procedure must only be used to remove and install the main bearing shells with the crankshaft in position.The removal procedure and the installation procedure must be completed for each pair of main bearing shells before the next pair of main bearing shells are removed.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that the main bearing cap is marked for the correct location and orientation.
Illustration 1 g03412919
If necessary, follow Step 2.a through step 2.c to remove cross over tube assembly (1).
Remove bolts (2) and bolts (3) from cross over tube assembly (1).
Remove cross over tube assembly (1) from the cylinder block.
Remove gasket (4) and gasket (5).
Illustration 2 g03412920
Remove bolts (6) and remove main bearing cap (7) from the cylinder block.
Illustration 3 g03412921
Remove lower main bearing shell (8) from main bearing cap (7). Keep the main bearing shell and the main bearing cap together. Note: The lower main bearing shell is a plain bearing that has no oil holes.
Illustration 4 g03412922
For number six main bearing, remove two thrust washers (9) from the cylinder block. In order to remove thrust washers (9), use Tooling (A) to rotate the crankshaft in the correct direction. If necessary, push the crankshaft toward the front of the engine or push the crankshaft toward the rear of the engine while you rotate the crankshaft, in order to aid removal. Note: The thrust washers have a locating tab at one end.
Illustration 5 g03412923
Push out upper main bearing shell (10) with a suitable tool from the side opposite the locating tab. Carefully rotate the crankshaft while you push on the bearing shell. Remove upper main bearing shell (10) from the cylinder block. Keep the bearing shells together. Note: The upper main bearing shell has a groove and two oil holes.Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
B 8T-3052 Degree Wheel 1
C 7H-1942 Dial Indicator 1
- Magnetic Base and Stand 1
This procedure must only be used to remove and install the main bearing shells with the crankshaft in position.The removal procedure and the installation procedure must be completed for each pair of main bearing shells before the next pair of main bearing shells are removed.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that the main bearing shells are clean and free from wear and damage. If necessary, replace the main bearing shells. Note: If the main bearing shells are replaced, check whether oversize main bearing shells were previously installed. If the thrust washers are replaced, check whether oversize thrust washers were previously installed.
Clean the journals of the crankshaft. Inspect the journals of the crankshaft for damage. If necessary, replace the crankshaft or recondition the crankshaft.