莱康明发动机大修手册 OVERHAUL MANUAL LYCOMING 76 SERIES AIRCRAFT ENGINES(41)

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7-53. Connecting Rods. (Figure 5-2). Assemble two new connecting rod bolts (4) in each connecting rod (5). Install new bearing inserts (3) in the connecting rod and cap (2), making sure the tang of each bearing insert enters the locating slot. Assemble each connecting rod and cap, tighten the nuts (1) moderately. Measure the inside diameter of each bearing and check for clearance against the measurements taken previously on the diameter of the crankpin journals.
MING 76 SERIES AIRCRAFT ENGINES Section7 Crankcase,Crankshaft and Reciprocating Parts
"A"DIM. MINIMUM FROM
DISTANCE
BOTTOM TO OPPOSITE

OF GROOVE EDGEOF CIRCLIP. GAP
"B"DIM. MINIMUM

Figure 7-11. Location of Gap When Installing Retaining Rings
NOTE

Do not take measurements of connecting rod bearing across the parting of the rod and cap. Take all measurements at 60° from the parting of connecting rod and cap.
7-54. Place the crankshaft on a suitable support on the bench so that all crankpins are free for installation of con-necting rods. Disassemble connecting rods after checking bearing ID, thoroughly coat both inserts and the crankpin journals with preservative oil and assemble rods on their respective crankpins. The order of assembly should be such that the numbers stamped on the caps and rods will be down (toward the sump).
NOTE

Connecting rods are marked at manufacture with the part number followed by a letter (A through E) designating weight groups. It is recommended that replacement sets of rods be of the same weight classification. Individual rods may be replaced by a service rod bearing the letter
"S".
7-55. The connecting rod bolts are tightened to a specified torque of 480 inch pounds (40 foot pounds).
7-56. Camshaft. See figure 7-3. Secure the tachometer shaft (6) to the end of the camshaft with pin (13). Assem-ble the camshaft gear (3) over stepped dowel (2) and secure gear to camshaft with lockplate (4) and hex head screws (5). On engine employing the propeller governor, install woodruff key (31) and governor drive gear (27)figure 7-3.
Section 7 OVERHAUL MANUAL
LYCOMING

Crankcase,Crankshaft and Reciprocating Parts 7-57. Crankcase. Place both crankcase halves on a s suitable support with the interior of each half facing upward.d. Place
new bearing inserts in the crankcase making certaain that the tang of each insert is fitted into the recess provvided in the crankcase.
Figure 7-12. Showing Timing Marks Positio n on Camshaft Gear and Crankshaft Gear
7-58. Place the left crankcase half on a suitable sup port on the bench with the cylinder pads down. This supports should be so constructed as to give approximately six in-ches clearance between the crankcase and bench.
7-59. Lay the right crankcase half on the bench with the cylinder pads down. Install the governor drive shaft gear where applicable.
7-60. A counterbored recess is provided for an oil seal ring at each bolt and stud location. Install a new oil seal ring (4, figure 7-2) at the base of each stud.
　
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