莱康明发动机大修手册 OVERHAUL MANUAL LYCOMING 76 SERIES AIRCRAFT ENGINES(17)

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5-18. Hydraulic Lifters. Place the hydraulic lifter assembly in the fixture (ST-233). Compress the plunger assembly until the spring clip is loose. Remove the spring clip from the lifter body. Remove the socket and plunger assembly from the body. In the event that the fixture is not available, the hydraulic lifter may be disassembled as follows: Insert a suitable tool into the socket and push the plunger assembly until oil is forced out of the vent hole and the pressure is released from the spring clip. Using a pair of needle nose pliers remove the spring clip from the lifter assembly. Remove the socket and plunger assembly from the lifter body.
NOTE

Some hydraulic lifters employ a circlip retaining ring in place of the spring clip as stated in paragraph 5-18.
CLEANING

5-19. Clean all cylinder, piston and valve train parts in ac-Figure 5-3. Two Methods of Supporting cordance with the general instructions described in Sec-Connecting Rodstion 3. Specific instructions follow:
Section5  OVERHAUL  MANUAL  LYCOMING  76  SERIES  AIRCRAFT  ENGINES 
Cylinder,Piston 
and Valve Train 
bb.  Maximum  removal  in  accordance  with 
figure 5-4. 

MAX. FIN REMOVAL
TO THIS LINE ONLY/
NEVER ENTER-
BASE METAL.
Figure 5-4. Maximum Fin Removal

5-20. Hydraulic Lifters. Use the cleaning basket in order to keep the valve operating mechanism parts separate. Dip the basket, with all parts contained in their proper compartment, in petroleum solvent.
CAUTION

It is imperative that various parts of each lifter assembly be kept together during the overhaul operations, in order that all component parts may be reassembled with their original mating parts and each completed assembly in-serted in its original location in the crankcase. In the event parts are intermixed, discard, and install new assemblies.
INSPECTION

5-21. Inspect all cylinder, piston and valve train parts in accordance with the general instructions described in Sec-tion 3. Specific instructions will be found in the following paragraphs, possible revisions will be found later in the section.
5-22. Cylinder Head (Visual Inspection). Examine the cylinder head thoroughly, checking for the following possible defects.
a.
Loose, scored, pitted or otherwise damaged valve seats. (Mark for replacement).

b.
Loose or damaged studs. (Replace with 0.003, 0.007 or 0.012 oversize studs).

c.
Loose or damaged spark plug heli-coil inserts. (Mark for replacement with oversize insert.

d.
Loose, cracked or scored valve guides. (Mark for replacement).

e.
Nicked, scored or dented mounting pads. (Intake and exhaust ports, rocker box covers.)

f.
Cooling fins. The following standards shall prevail insofar as acceptance or rejection of cylinder heads are concerned.

　
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