9427 Mercruiser CYLINDER HEAD ASSEMBLY

1. Turn the crankshaft until the timing mark on the crankshaft gear (2) is in alignment with the timing mark on the camshaft gear (1). Check the bearing caps for a number as to their location. If a number can not be seen, put a number on the left side of cap and cylinder block.
TYPICAL EXAMPLE2. Fasten a hoist to the crankshaft.3. Remove the caps for the main bearings.4. Remove the crankshaft. Weight is 145 lb. (66 kg).5. Remove the crankshaft main bearings from the cylinder block and caps. 6. Remove the crankshaft gear (3) with tooling (A).Install Crankshaft
1. Heat the crankshaft drive gear and install it on the crankshaft. Maximum temperature to be used on crankshaft gear is 600°F (315°C).2. Clean the surfaces on the cylinder block for the bearings. Install the upper halves of the main bearings in the block. Put clean oil on the bearings. 3. Fasten a hoist to the crankshaft and put it into position in the cylinder block. The timing marks (1) on the crankshaft gear and camshaft gear must be in alignment as shown. 4. Clean the main bearing caps. Install the lower halves of the main bearings in caps. 5. Check the main bearing clearance with wire (A). Install the wire between the crankshaft and bearing. Install the caps in their correct places. Be sure the number on the cap is toward the number on the pan surface of the left side of the cylinder block.6. Put clean oil on the threads of the bolts and on the faces of the washers that hold the main bearing caps. Install the bolts and washers. Tighten both bolts to 30 3 lb.ft. (4.1 0.4 mkg). Put a mark on the bolt heads and bearing caps. Tighten the bolts 90° from the mark as shown. Remove bearing caps and measure the thickness of the wire (A). Main bearing clearance (wire thickness) with new bearings must be .0030 to .0059 in. (0.076 to 0.150 mm). Maximum permissible clearance with used bearings is .010 in. (0.25 mm).7. Put clean oil on the lower halves of main bearings. Install the caps in their correct places. Install the bolts and washers. Tighten bolts to 30 3 lb.ft. (4.1 0.4 mkg). Put a mark on the bolt heads and caps. Tighten each bolt 90° from the mark. 8. Check the crankshaft end clearance with tool group (B). End clearance is controlled by the thrust bearing (2) on the rear main. End clearance with new bearings must be .0025 to .0145 in. (0.064 to 0.368 mm). Maximum permissible end clearance with used bearings is .025 in. (0.64 mm). Install thrust bearing with side marked "BLOCK SIDE" toward the cylinder block.9. If the accessory drive gear, idler gear or camshaft gear has been removed or a replacement has been made, it is necessary to put the fuel injection pump into correct time after the engine is assembled. See REMOVE AND INSTALL FUEL INJECTION PUMP HOUSING AND GOVERNOR.end by: a) install pistonsb) install timing gear coverc) install flywheel housingd) install engine