莱康明发动机大修手册 OVERHAUL MANUAL LYCOMING 76 SERIES AIRCRAFT ENGINES(31)

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7-9. On engines equipped with a governor drive, remove the governor drive cover (25), "o" ring (26), and governor drive thrust washer (27), (Figure 7-3) from the nose of the crankcase.
7-10. The crankcase may be separated by first resting on the bottom of crankcase and gently tapping with a soft hammer the thru-studs on the loose ends until the crankcase begins to separate. Place the crankcase on the left side and continue to remove the right half of crankcase. Reach down through the cylinder pads and push the crankshaft bearing insert down on the crankshaft, so they will not fall when crankcase half is removed. Separate the crankcase by hand and remove the bearing inserts and crankshaft assembly.
7-11. Remove the camshaft, tachometer drive adapter and the crankcase breather baffle. Engines equipped with a propeller governor it is necessary to remove the governor drive gear at the time the camshaft is removed. Also remove the governor drive shaftgear from the right half of the crankcase.
10
9
1.
Nut

2.
Lockplate

3.
Gear

4.
Driven Impeller

5.
Key

6.
Oil Pump Shaft

7.
"O" Ring Seal

8.
Oil Pump Body

9.
Seal

10.
Gasket

11.
Cover

12.
Driving Impeller

 

Figure 7-1. Oil Pump Assembly
Section7  OVERHAUL  MANUAL  LYCOMING  76  SERIES AIRCRAFT  ENGINES 
Crankcase,Crankshaft 
and Reciprocating Parts 
1. Gasket 
2. Oil Level Gage 
3. Filler Tube 
4. "O" Ring Seal 
5. Bearing Inserts 
6. Oil Relief Valve Plug 
7. Gasket 
8. Spring 
9. Ball 
10. Crankshaft Seal 

-5

Figure 7-2. Crankcase Assembly
7-13. Camshaft. Remove the camshaft gear and the bearing inserts, bolts and nuts. Reassemble each cap with tachometer shaft. its corresponding rod. Rods and caps are not inter-
changeable.7-14. Remove the oil and vacuum pump drive shaft by removing the nut and lockplate. Use service tool ST-416 7-16. Remove the crankshaft oil seal and the expansion to turn pump shaft while holding nut with open end plug from the crankshaft. Do not remove the propeller
wrench. Remove oil pump drive gear. Remove drive shaft flange bushings from the flange of the crankshaft unless from crankcase. they are damaged and/or loose.
7-15. Crankshaft. With the crankshaft properly supported NOTE at front and rear main bearings, remove the nuts securing the rod caps to the connecting rod. Remove the rods by Engines that are equipped with a propeller governor drive tapping on the rod bolts with a soft hammer. Discard the do not employ an expansion plug in the crankshaft.
OVERHAUL  MANUAL  LYCOMING  76  SERIES  AIRCRAFT  ENGINES  Section 7 
　
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