CYLINDER BLOCK HEAD TO BLOCK ALIGNMENT The cylinder block is made of cast iron. For increased cylinder block rigidity and noise and vibration reduction, a steel stiffener plate attaches to the bottom. 9 The main and piston lubricating channels are drilled longitudinally through the block. These are plugged at the front of the block. The main channel opens into a cast-in channel that supplies oil to the timing gears. The piston cooling channel is covered by the timing gear cover. 8 Figure 9 — Head to Block Alignment Screws and Washers Three screws and washers installed at the side (two in the block and one in the head) align the head from side to side at assembly.
Fore and aft, the head is aligned by contact with the timing gear mounting plate. Figure 8 — Cylinder Block and Stiffener Plate 1. Cylinder Block 2. Block Stiffener Plate Main bearing caps are made of nodular cast iron machined together with the cylinder block. Cast alignment slots in the block and tabs on the caps ensure proper alignment at installation. Each cap is marked with its location beginning with No. 1 at the front. Cap Nos. 4 and 7 are unique and are not numbered. The head is aligned with the timing gear plate by screws passed through the plate into the head and tightened securely.
It is extremely important to remove these screws before attempting to remove the cylinder head from the block. Failure to heed this caution may result in severe damage to the timing gear plate and other engine components. The block includes cylinder liners that contact the coolant directly (wet liners). The casting shape follows the contours of the cylinders to increase rigidity and reduce noise. Page 18 DESCRIPTION AND OPERATION 1. Cylinder Head 2. Alignment Screws and Washers 3. Cylinder Block