MCi Crusader II 1989 Maintenance Manual page 499

Date
1-1-89
Page
16-29
MC-9 MAINTENANCE MANUAL
OIL
PUMP
ANO
BEARING HEAD
.-:'-'--- ! RELIEF VALVE ASSEMBLY
Y
I
{VALVE, SPRING, AND RETAINER PIN)
DRIVE SEGMENT
FIVE-LOBED ROTOR
------FOUR-LOBED ROTOR
W
~~ECCENTRIC
( ~ PIN
~:7
L
0-RING
·if-______.coV£R
,,
Figure 16-35: Oil Pump Parts
6. Use only new gaskets during reassembly. Ensure all
metal gaskets (includes cylinder head, valve plate, and
unloader by bypass plug gaskets) are installed dry. All fiber
gaskets should be finger wiped with compressor oil before
installing.
REASSEMBLY
PISTON
\
\
LOCK\ RING
EPOXY
ENCAPSULATED
CAPSCREWS
~
........,
CONNECTING
ROD CAP
1. Prior to installing new piston rings, it is necessary to
break the hard glazed surface of the cylinder in order to
reduce the wearing-in period of the new rings. Break the
glaze by rehoning lightly in an up-and-down rotating
motion. Clean thoroughly after breaking glaze.
Figure 16-36: Piston and Connecting Rod Assembly
2. The gap between the ends of the piston rings can be
checked with a feeler gauge by inserting the ring into the
piston bore about one inch below the top of the bore. Align
the ring in the bore by pushing it slightly with a piston. The
maximum and minimum allowable ring gaps are 0.013 and
0.005 inches (0.33 and 0.127 mm).
3. Install the piston and rod assemblies (figure 16-36) up
through the bottom of the crankcase and into the cylinders.
Allow pistons to extend beyond the top of the cylinder to
enable installation of piston rings. Pistons should be
· ,stalled so that the chamfer on the connecting rod faces
Jward the crankshaft journals. Center rods on each crank-
shaft throw may be installed in either direction (figure 16-
37}.
NOTE:
Do not push pistons back Into
cylinder until after crankshaft is installed.
CHAMFERED
EDGE
(
'
•
. . • •
◄
...
•
...
~
CHAMFERED
EDGE
:I
LEND
-THRUST
WASHER
. .
...
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