3-6
4.
Push the piston rods down so that the piston
rings extend below the cylinders. Remove and discard
piston rings. Use only new rings when reassembling the
compressor. (See Figure 3-12.)
1
2
3
4
1. Oil Pressure Relief Valve
2. Connecting Rod and Cap
3. Capscrew
4. Check Valves
Figure 3-11. Bottom Plate and Oil Strainer Removed
Figure 3-12. Piston Rings Removed
b. Crankshaft and Seal End Thrust Washer
CAUTION
Do not allow crankshaft to drop on connecting
rods inside the crankcase when removing the
crankshaft.
1.
Push piston rod assemblies out of the way and
remove crankshaft and seal end thrust washer.
2.
Remove and check operation of oil return check
valves (See Figure 3-11).
The check valves are free
floating devices and can easily be checked visually.
3.
Remove and check oil pressure relief valve (See
Figure 3-11). The oil pressure relief valve is a spring
loaded device which can be checked by using a small piece
of stiff wire to ensure that the spring can be depressed.
4. Remove piston rod assemblies.
c. Pistons, Rods, and Rings
1.
Piston and pin, and connecting rod and rod cap
are matched sets and must not be interchanged. That is, if
either the piston or piston pin is to be replaced, you must
replace both of them. Likewise, if a connecting rod or rod
cap must be replaced, both must be replaced.
2.
Match mark and disassembly pistons, pins,
connecting rods, and caps. (See Figure 3-13)
3.
Check wear dimensions of disassembled parts to
determine if they are worn beyond limits given in
Table 3-2.
4.
If parts are worn beyond limits, replace them in
matched sets as specified above.
5.
Coat piston pins with compressor oil and
reassembly pistons, pins, and connecting rods in matched
sets.
1
2
3
4
5
6
1. Lock Ring
2. Connecting Rod
3. Connecting Rod and Cap
4. Capscrew
5. Piston Pin
6. Piston
Figure 3-13. Connecting Rod, Piston, and Pin
d. Seal End Main Bearings
1.
Inspect seal end main bearings. Check wear
dimensions to determine if they are worn beyond limits
given in Table 3-2.
2.
If worn beyond limits remove seal end main
bearings.
