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7-61. Oil and Vacuum Pump Drive. See figure 7-1. Install key (5) in keyway on the oil and vacuum pump shaft (6). Install shaft in left half of crankcase. Place oil pump drive gear (3) on shaft and secure with lockplate (2) and nut (1). Use service tool ST-416 to tighten pump nut. Torque to 55 foot pounds. Secure nut with lockplate.
7-62. Prelubricate the camshaft lobes and bearings with Lubi-Bond or equivalent. Place the camshaft assembly in the left half of crankcase. As the camshaft assembly is place in the crankcase, the breather baffle must be install-ed at the same time. The baffel is marked on one side "toward rear of engine" and must be installed with the flat edge toward the sump. The timing mark on the cam-shaft gear must be in a plane with the parting surface of the crankcase. The mark must be located between the camshaft and the crankshaft gear as shown in figure 7-12.
NOTE

The timing mark on the camshaft gear and crankshaft gear may be a etched straight line, circle or a dot.
7-63. Install new oil seal in tachometer drive adapter. Slide adapter over tachometer shaft so the adapter will be at the proper location on the dowel of crankcase.
76 SERIES AIRCRAFT ENGINES
7-64. Prelubricate the main bearing inserts of the left half of the crankcase. Pick up the crankshaft assembly by the odd number connecting rods and lower into the left half of crankcase, being careful not to move the timing mark on the camshaft gear. The timing mark on the crankshaft gear and camshaft gear must be in a plane with the par-ting surface of the crankcase as shown in figure 7-12.
NOTE

If the timing marks are not in the proper plane after the crankshaft is in place, rotate the crankshaft until the tim-ing mark is in the correct position. Raise the camshaft un-til the camshaft gear is disengaged from the oil pump drive gear and rotate the camshaft until timing mark is the correct plan with the crankcase parting surface. See
figure 7-12.
7-65. See figure 7-13. If either the crankcase or crankshaft has been replaced, the crankshaft end clearance must be checked. When crankshaft is located in the left crankcase half push the crankshaft forward as far as possible. Check the clearance, at the rear of the front main bearing sur-face, between the crankcase and crankshaft shoulder. (Point "A"). If clearance exists between crankcase and crankshaft thrust surface (Point A) regrind the front face of the crankshaft slinger (Point "B") to remove the clearance. Grind only that amount, from the face of the sl-inger, necessary to remove clearance. Push the crankshaft as far as possible to the rear of crankcase. Check the clearance between the thrust surface of crankshaft and
crankcase.
7-66. Prelubricate the main bearing crankcase half.
7-67. Apply a film of non-hardening the outside mating surfaces of each compound must not be applied to mating surfaces such as the bearing imbed a length of "oo" silk thread
　
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