MCi Crusader II 1989 Maintenance Manual page 498

Date
1-1-89
Page
16-28
MC-9 MAINTENANCE MANUAL
15. Remove six capscrews and remove shaft seal cover
and carbon washer (figure 16-33).
Figure 16-33: Removing Shaft Seal Cover
and Carbon Washer
16. Tap seal end of crankshaft to loosen seal grip on
shaft. Using two long screwdrivers, pry out the shaft seal
(figure 16-34).
CAUTION: Do not allow crankshaft to
drop on connecting rods inside the crank-
case when removing the crankshaft.
Figure 16-34: Carefully Pry Out Shaft Seal
17. Push piston rod assemblies out of the way and
remove the crankshaft and seal end thrust washer.
18. Remove and check operation of the oil return check
valves. The check valves are free-floating and can easily be
checked visually.
19. Remove and check oil pressure relief valve. 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 mechanism can be depressed.
20. Remove the piston rod assemblies.
21. Remove the suction strainer. Clean the strainer screen
with solvent. Inspect the strainer; if damaged, replace it.
OIL PUMP AND BEARING HEAD - If it was determined that
the oil pump was not operating properly, the entire oil
pump and bearing head assembly must be replaced.
Replacement parts for the pump are not available.
If the oil pump was operating properly, disassemble the
pump, clean all parts, and reassemble the pump as follows
(steps 22-32).
22. Remove pump cover and 0-ring (figure 16-35).
23. Remove pin by holding eccentric in, tipping top of pin
slightly outward, and turning pump bottom side up; pin
should fall out.
24. The remainder of the pump components can now be
removed by pushing out the drive segment from the crank-
shaft end of the bearing head.
25. Remove the relief valve assembly by removing the
retainer pin.
26. Clean all parts; coat all moving parts with compressor
oil before proceeding with reassembly.
27. Insert drive segment and five-lobed rotor, ensuring
that the pins on the rotor are inserted into the appropriate
holes in the drive segment drive wheel.
28. Reinstall the four-lobed rotor inside the five-lobed
rotor, ensuring that the end with the counterbore is in-
stalled toward the drive segment.
29. Reinstall the eccentric.
30. Reinstall the pin in the shortest of the two grooves
inside the bearing head.
31. Reinstall the 0-ring and pump cover.
32. Reinstall the relief valve assembly.
PISTONS, PIN, AND CONNECTING RODS - Piston and-
pin, and connecting rod and rod cap are matched sets and
must not be interchanged. 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.
33. Matchmark and disassemble pistons, pins, connect-
ing rods, and caps.
34. Check wear dimensions of disassembled parts to
determine if they are worn beyond limits. Refer to figure
16-25. If parts are worn beyond limits. replace them in
matched sets as specified above.
35. Coat piston pins with compressor oil and reassemble
piston pins, and connecting rods in matched sets.
INSPECTION ,
1. Clean all parts with an approved solvent such as
methyl ethyl ketone (MEK). Use a stiff bristle brush to
remove dirt from grooves and crevices.
2. Inspect all parts for wear and overall condition. Replace
any defective or excessively worn parts.
3. Inspect suction and discharge valve seats on both
sides of valve plate.
4. Inspect operation of unloader bypass piston.
5. Take inventory of all parts to ensure they are complete.
After cleaning, coat all moving parts with compressor oil
before reassembly.