Onan NHC Series Operator's/Service Manual And Parts Catalog page 244

R E A R B E A R I N G E N O P L A T E
L O C K P I N
A L I G N B E A R I N G O I L H O L E S
W I T H O I L H O L E S IN B E A R
I N G B O R E
T H R U S T
W A S H E R
S H I M
B E A R I N G
P R E C I S I O N T Y P E - O O N O T L I N E R E A M O R B O R E
F I G U R E 5 4 . B E A R I N G S F O R R E A R B E A R I N G P L A T E
NOTE: If the special combination tool isn't available,
it's necessary to remove the lock pins with side cutters
or Easy Out tool. After the new bearings are installed,
insert new lock pins.
Before installing the front bearing (Figure 55), use the
Locktite Bearing Mount furnished in the bearing kit.
Use the towelette in the package to clean the outside
of the bearing and the bearing bore in the block.
the bearing flush with the block using the combination
driver just used for the rear bearing. Wipe off any,-^
excess Locktite around the bearing. Allow at least om
hour for hardening at room temperature.
Lubricate the front main bearing lightly with oil and
insert the crankshaft. With the rear bearing plate gasket
in place and the rear plate bearing lubricated, slide
the thrust washer (grooves toward crankshaft) and plate
over the end of the crankshaft. Line up the notches of
the thrust washer with the lock pins before tightening
the end plate or the lock pins will be damaged.
NOTE: A light film ol oil on the thrust washer may hold
it in place while installing the crankshaft.
CRANKSHAFT ENDPLAY
After the rear bearing end plate has been tightened
using the torque recommended in Assembly Torques
and Special Tools, check the crankshaft endplay as
shown in Figure 56. If there is too much endplay (see
Dimensions and Clearances for minimum and maximum
endplay), remove the rear bearing end plate and add a
shim (Figure 54) between the thrust washer and plate.
Reinstall the end plate making sure the thrust washer
and shim notches line up with the lock pins. Torque
and recheck endplay of the crankshaft.
N O T E : Do not add a d d i t i o n a l
t h r u s t w a s h e r w h e n r e p l a c -
i n g f r o n t b e a r i n g .
F R O N T M A I N
B E A R I N G S O R E
A L I G N B E A R I N G v
N O T C H E S W I T H
L O C K P I N S
A N D M A T C H
O I L H O L E S
B 4 9
F R O N T
M A I N B E A R I N G
P R E C I S I O N T Y P E -
D O N O T L I N E B O R E O R R E A M O R B O R E
R E A R
nillini
M E A S U R E E N D P L A Y H E R E •
( R E F E R T O D I M E N S I O N S
A N D C L E A R A N C E S )
FIGURE 55. FRONT BEARING I N S T A L L A T I O N
FIGURE 56. CRANKSHAFT E N D P L A Y
j WARNING } Breathing vapor from towelette and
^•^^"•••^^"J prolonged contact with skin can be
harmful. Be sure area is well ventilated.
After allowing three to four minutes for drying, apply
the Locktite Bearing Mount from the small tube to the
mating surfaces of the bearing and bearing bore. Install
OIL SEALS
The bearing plate must be removed to replace its oil
seal. Drive the oil seal out from the inside using
bearing plate driver 420B181 and gear cover driver
420B313.
36
902521