5041401 EVINRUDE * CYLINDER HEAD ASSEMBLY

The rocker shafts and push rods do not have to be removed to remove the crankshaft but bent push rods can be the result if they are not removed.
1. Put the engine in the position as shown. The weight of the 3512 Engine is approximately 5443 kg (12,000 lb.). The weight of the 3508 Engine is approximately 4445 kg (9800 lb.). 2. Remove counterweights (1) from the crankshaft. 3. Remove bearing caps (2) from the connecting rod and push the connecting rods away from the crankshaft. Use wire to hold the upper half of the connecting rods away from the crankshaft. 4. Remove the center main bearing cap and remove two thrust plates (3) from each side of the main bearing. 5. Use two of the bolts that hold the flywheel to the crankshaft and install a bolt in each end of the crankshaft. Fasten a hoist to the crankshaft as shown.6. Remove the remainder of main bearing caps (5) and remove crankshaft (4) from the engine block. The weight of the 3512 Crankshaft is 454 kg (1000 lb.). The weight of the 3508 Crankshaft is 299 kg (660 lb.). 7. If necessary, remove bolts (7) to remove gears (6) from each end of the crankshaft.Install Crankshaft
1. If gears (1) were removed, install gears (1) on each end of the crankshaft and install the bolts to hold the gears. 2. Make sure the upper halves of main bearings (2) (bearings with oil holes) are in position in the cylinder block. Put clean engine oil on the bearings. 3. Fasten a hoist to crankshaft (3) with two flywheel bolts and put it in position. Make sure the word "FRONT" on the end of the crankshaft is toward the front of the cylinder block.4. Make sure the lower halves of the main bearings are in position in the main bearing caps. Put clean engine oil on the bearings and install all but the center main bearing cap on the cylinder block. The caps must be installed with the word "FRONT" and the cast part number toward the front of the cylinder block. Each cap has a number on the bottom surface and must be installed in the same position as the correct number on the right side of the block pan rail.
Do not use an impact wrench to tighten the bolts 180° 5° of a turn more.
5. Put clean engine oil on the main bearing cap bolts and tighten the bolts in the number sequence as shown to a torque of 136 14 N m (100 10 lb.ft.). Then tighten each bolt in the number sequence as shown 180° 5° of a turn more. 6. Put clean engine oil on the thrust plates and install thrust plates (8) on each side of the center main bearing. Install the center main bearing cap and the bolts to hold it. Use the same procedure in Step 5 to tighten the bolts. See INSTALL CRANKSHAFT MAIN BEARINGS for the correct bearing clearance check and crankshaft end play.7. Remove the wire that holds the upper half of the connecting rods in position. Make sure the upper and lower halves of the bearings are in position on the connecting rods and the rod caps. Put clean engine oil on the bearings.
Do not use an impact wrench to tighten the bolts 90° 5° of a turn more.
8. Put the connecting rods in position on the crankshaft. Install caps (9) in the same location as they were removed from with the number on the side of the cap next to the number on the side of the connecting rod. Put 5P960 Multipurpose Type Grease on the bolt threads and contact surfaces of the bolts and caps and tighten the bolts in number sequence as follows: Bolts (12) and (13) are on the end of the rod cap opposite the end that has the location pin for correct installation. a) Tighten bolts No. 10 and 11 to a torque of 90 5 N m (65 4 lb.ft.).b) Tighten bolts No. 12 and 13 to a torque of 90 5 N m (65 4 lb.ft.).c) Tighten bolts No. 12 and 13 again to 90 5 N m (65 4 lb.ft.).d) Tighten each bolt 90 5° of a turn more. See INSTALL CONNECTING ROD BEARINGS for the correct bearing clearance check.
Each counterweight has a number and must be installed in the same position as the correct number on the crankshaft mounting pad to prevent damage to the crankshaft when the engine is run.
9. Make sure the dowels are in position and install counterweight (14) on the crankshaft.
Do not use an impact wrench to tighten the bolts 120° 5 of a turn more.
10. Put 2P2506 Thread Lubricant on the counterweight bolts and tighten the bolts to a torque of 50 5 N m (37.5 4.0 lb.ft.). Then tighten the bolts 120° 5° of a turn more.11. Put engine in a vertical position.end by:a) install rocker shafts and push rodsb) install front drive housingc) install front balancer (3508)d) install rear gear groupe) install piston cooling jets