815930A 5 Mercruiser HOUSING ASSEMBLY, Driveshaft (1.65)

1. Remove bolts (1) and the washers that hold rocker shaft assembly (2) in position.2. Remove rocker shaft assembly (2). Remove the O-ring seal from the rear rocker arm support bracket.3. Put identification marks on push rods (3) as to their location in the engine. Remove the push rods.Install Rocker Shaft Assembly & Push Rods
1. Install push rods (1). Make sure they are in their original location in the engine and in position in the valve lifters.
Loosen the adjusting screws on the rocker arms. This will prevent a bent valve or push rod during installation of the rocker shaft assembly.
2. Install a new O-ring seal in the rear rocker arm support bracket. Apply 2P-2506 Thread Lubricant on all of the bolts that hold the rocker shaft assembly in position except for the bolt that goes through the rear rocker arm support bracket.3. Put rocker shaft assembly (2) in position on the engine. Make sure the dowels in the support bracket are in alignment with the dowel holes in the cylinder head. Make sure the rocker arms are engaged with the push rods.4. Install the bolts and washers that hold the rocker shaft assembly in position, and tighten them until they are finger tight.
3304 Engine Sequence
3306 Engine Sequence5. Tighten the bolts that hold the rocker shaft as follows: a. Tighten the bolts in number sequence to a torque of 156 N m (115 lb ft).b. Tighten the bolts in number sequence to a torque of 250 17 N m (185 13 lb ft).c. Tighten the bolts again in number sequence to a torque of 250 17 N m (185 13 lb ft).6. See the topic "Valve Clearance Setting" in the Testing & Adjusting Manual. Make an adjustment to the valves so the inlet valves have 0.38 mm (.015 in) clearance and the exhaust valves have 0.64 mm (.025 in) clearance.End By:a. install valve coverDisassemble Rocker Shaft Assembly
Start By:a. remove rocker shaft assembly and push rods 1. Remove O-ring seal (1) from the rear support bracket. A replacement of the O-ring seal must be made each time the head bolt is removed from the rear support bracket. 2. Remove retainer ring (6), washer (5), spring (4) and washers (3) from each end of the rocker shaft. Make a note of the number of washers (3) used at each end of the shaft. Remove rocker arms (2) from each end of the rocker shaft. All the rocker arms, springs, washers and brackets, except the rear support bracket, can be removed from the shaft. 3. Remove the pin from the rear support bracket with a hammer and punch. Remove rear support bracket (7) from the shaft.4. Remove the plugs from each end of the shaft if necessary.Assemble Rocker Shaft Assembly
1. Install rocker arms (5), brackets (1), washers (4) and springs (2) on the rocker shaft.2. Install rear support bracket (6) on the rocker shaft. Make sure the hole in the rear support bracket is in alignment with the hole in the rocker shaft.3. Put pin (3) in position in the bracket. 4. Install pin (3) through the bracket and shaft with a hammer.5. Pin (3) must extend 9.60 mm (.378 in) above the bracket. 6. Install O-ring seal (7) in the rear support bracket. Install rocker arm (8), the original number of washers, spring, washer and the retainer ring on the rocker shaft.7. Install the front support, rocker arm, original number of washers, spring, washer and the retainer ring on the rocker shaft.8. Install the plugs in each end of the rocker shaft if they were removed.End By:a. install rocker shaft assembly and push rods