Yanmar 1GM User Manual page 98

92
B
A
d. Position the new seal in the housing recess with its
open end facing the inside of the bearing hous ing .
Drive the seal into place with a suitably sized sea l
driver.
II. Refer to Main Bearings for info
rmation con cern ing
inspection of the main bearings and thrust bear ings .
12. Reinstall the crankshaft by reve rsing the remo val
procedure white noting the followi ng:
a. Thoroughly lubricate the main bearings and thrust
bearings.
b. Install the inner, front thrust bearing so the oil
grooves arc toward the inside of the crankcase and
the tab fils into the recess (F igure 75) in the cran k-
case. Apply a light coating of grease to hold the
thrust bearing in place.
c. Install a new O-ring (A, Figure 76) on the main
bearing housing.
d. Tighten the main bearing housing bolts to the to rque
specified in Table 2.
e. Install the outer front thrust bearing so the oi l
grooves (A, Figure 77) are toward the outside ofthe
crankcase and the tab (B) fits onto the pin in the
crankcase.
f. Install the thrust washer
(F igu re 73) so the beveled
side of the inner hole is toward the crankcase.
- - - - -
CHAPTER FIVE
Cam sh aft
gear
g. Measure cra nkshaft end play by inserting a feeler
gauge betw een the crankshaft ma in jo urna l and the
inn er thrust bearing, or by insta lling a dial gauge
that me asures fore and aft movement of the fly-
wheel or cra nkshaft. Using a large screwdriver,
force the crankshaft back and forth . Measure crank-
shaft end play and co mpa re the measurement with
the specificat ion in Ta ble 1. Replace the inner thrust
bea ring to obta in the des ired end play.
h. Align the timing marks (Figu re 78) on the cams haft
and crankshaft gears when installing the cra nkshaft
gear.
l.
Chec k gea r backlash by insta lling a dial indicator as
show n in Figu re 79 or by rotating the gear tee th
with soft solder between the gear teeth. Compare
the measureme nt with the specificat ion in Ta b le
I.