0436607 JOHNSON CARBURETOR ASSEMBLY

1. Put the engine in position on tooling (A) as shown. 2. Turn the crankshaft until the timing mark "C" on crankshaft (1) is in alignment with the timing mark "C" on camshaft gear (2) as shown in the inset. 3. Remove nuts (4) that hold connecting rod caps (3) to the connecting rods. Remove the rod caps. The connecting rod bolts are loose on the connecting rod and can fall out when the nuts are removed.4. Remove the connecting rod bolts from the connecting rods.
If the piston and connecting rod assemblies are pushed down too far in the cylinder liners, the piston can hit the fuel injection nozzle or the intake exhaust valve which can cause damage to the fuel injection nozzle or the piston.
If the intake and exhaust valves are closed it can be difficult to push the piston and connecting rod assembly down in the cylinder liner. 5. Push No. 2, 3, 4, 5 piston and connecting rod assemblies (5) down in the cylinder liners far enough to clear the crankshaft. Move connecting rod away from the crankshaft. 6. Remove main bearing cap bolts (7) and remove main bearing caps (6). 7. Remove thrust bearings (8) from the No. 7 main bearing. 8. Install tooling (B) to crankshaft (9). Fasten a hoist to tooling (A). Lift crankshaft (9) straight up from the cylinder block. 9. Use tooling (C) to remove the gear from the crankshaft. The weight of the crankshaft is 95 kg (210 lb.). 10. If necessary remove main bearings (10) from the cylinder block and main bearing caps. Remove rod bearings (11) from the connecting rods and rod bearing caps.Install Crankshaft
1. Put the engine in position on tooling (A). Install the bearings dry when the clearance checks are made. Put clean engine oil on all the bearings for final assembly.
Make sure the upper and lower halves of the main bearings are installed so the bearing tabs fit into the notch in the cylinder block and main bearing caps.
2. If the bearings were removed from the engine, clean the bearing surfaces in the cylinder block and the connecting rods. Install the upper halves of connecting rod bearings (1) and main bearings (2). 3. Heat crankshaft gear (3) to a maximum temperature of 315°C (600°F). Install the gear on the crankshaft. 4. Install tooling (B) and tooling (C) on the crankshaft. Fasten a hoist to the crankshaft and put crankshaft (4) in position in the cylinder block with timing mark "C" on the crankshaft gear (5) with the timing mark "C" on the camshaft gear (6). No. 1 and 6 connecting rods must be in alignment with their respective crankshaft journals when the crankshaft is installed in the block. When the bearing clearance is checked and the engine is in a vertical position, such as in the vehicle, the crankshaft will have to be lifted up and held against the upper halves of the main bearings to get a correct measurement with the Plastigage. The Plastigage will not hold the weight of the crankshaft and give a correct indication. If the engine is in a horizontal position, it is not necessary to hold the crankshaft up. Do not turn the crankshaft when the Plastigage is in position to check clearances.5. Check the main bearing clearances with Plastigage (D) as follows: a. Put a piece of Plastigage (D) in position as shown.
Make sure the part number on the main bearing cap is toward the front of the engine and the number on the main bearing cap is the same as the number on the cylinder block on the left side of each main bearing cap.
Do not turn the crankshaft when Plastigage (D) is in position.b. Install main bearing cap (7). Put clean engine oil on the bolt threads and the face of the washers and install the bolts. Tighten the bolts to a torque of 40 4 N m (30 3 lb.ft.).
Do not use an impact wrench to tighten the bolts the additional 90°.
c. Put a mark on each bolt and main bearing cap, then tighten the bolts 90° more.d. Remove the main bearing caps. Remove Plastigage (D) and measure the width of the Plastigage. The main bearing clearance must be 0.076 to 0.165 mm (.0030 to .0065 in.). The maximum permissible clearance with used bearings is 0.25 mm (.010 in.). 6. Put clean oil on thrust bearing (9) for the No. 7 main bearing. Install the thrust bearing with the identification "BLOCK SIDE" toward the cylinder block and the tabs on the thrust bearings in the machined area in the cylinder block. Tabs (8) will not let the thrust bearings be installed backward. On early model thrust bearings, make sure notches (10) in he thrust bearing are installed toward the crankshaft. 7. Install main bearing caps (7) and tighten bolts as in Steps 5b and 5c. 8. Check the crankshaft end play with tooling (E). The end play is controlled by the thrust bearings on the No. 7 main bearing. End play with new bearings is 0.064 to 0.368 mm (.0025 to .0145 in.). The maximum permissible end play with used bearings is 0.64 mm (.025 in.). 9. Move No. 2, 3, 4 and 5 connecting rods in position under the crankshaft. Pull connecting rod and piston assemblies (11) into position against the crankshaft. Install the connecting rod bearings dry when the clearance checks are made. Put clean engine oil on the connecting rod bearings for final assembly. 10. Install lower half of the rod bearing (12) in the connecting rod cap. Be sure the tabs in the back of the connecting rod bearings are in the tab grooves of the connecting rod and cap.11. Use Plastigage (D) to check the connecting rod bearing clearance.12. Put Plastigage (D) in position on the crankshaft as shown.13. Put clean engine oil on the threads of the rod bolts and seat surfaces of the nuts.
When connecting rod caps are installed, make sure the number on the