Kohler K91 Service Manual page 123

NOTE : The lower balance gear should be installed
after the crankshaft has been installed .
1 . Lubricate the crankshaft rear bearing surfac e .
I nsert the PTO end of crankshaft through rear
bearing . Align the primary timing mark on
crankshaft with the primary timing mark o n
u pper balance gear. Refer t o Figure 1 2- 1 7 .
Press t h e crankshaft into rear bearing until the
cra n kgear just starts to mesh (about 1 / 1 6 " )
with the center ring of balance gear teeth .
Figure 1 2-1 7 . T i m i n g Marks O n Balance Gear
And Crankshaft.
NOTE : If the crankshaft and bearing plate have not
been separated , position the fuel line and wiring
harness between the bearing plate and crankcase
before pressing the crankshaft all the way i n .
2 . A l i g n t h e primary timing mark o n t h e crank­
shaft with the timing mark o n the camshaft
gear. Refer to Figure 1 2-1 5 . Press the crank­
shaft a l l the way into the rear bearing . Make
sure the camshaft and crankshaft gears mesh
and that the timing marks align while pressing .
3 . Position the crankshaft s o i t i s a bout 1 5 0 past
BOC. I nstall 3/8 " spacer, and one . 0 1 0 " shim
spacer. Align the secondary timing mark o n
t h e lower balance g e a r with t h e secondary tim­
ing mark o n the crankshaft . I n stall the lower
balance gear o n the stu b shaft . If properly
timed . the primary timing mark o n the cra n k­
shaft will now be aligned with the secondary
timing mark o n the lower balance gear. Refer
to Figures 1 2-9 and 1 2-1 7 .
4 . I nstall one ( 1 ) . 020 " shim spacer and retaining
ring (rounded edge towards gear) . Check end
1 2 . 6
Crankshaft
Secondary Timing Mark
play o f lower balance gear a s instructed u nder
" INSTALL BALANCE GEARS . " Refer to Figures
1 2-9 and 1 2- 1 0 .
5 . Check the timing o f t h e crankshaft . camshaft,
and balance gears .
•
The primary mark on crankshaft should alig n
with the primary timing mark on u p pe r bal­
ance gear. Refer to Figure 1 2- 1 7 .
•
The primary mark on cran kshaft should align
with the secondary timing m ark o n lower
balance gear. Refer to Figure 1 2- 1 6 .
•
The primary mark on crankshaft should alig n
with timing mark o n camshaft. Refer t o Fig­
ure 1 2- 1 5 . If the marks do not align , the
timing i s i ncorrect and must be corrected .
2A) NEW STYLE BALANCE GEAR ASSEMBLY -
WITH A BALANCE GEAR TIMING TOOL
1 . Count and mark the teeth on the crankshaft
gear . and the lands (notches between teeth)
o n the camshaft gear as follows:
Crankshaft - Locate the primary timing mark
o n crankshaft . While looking at the PTO end of
crankshaft , start with the tooth directly below
timing mark and count
counterclockwise directio n . Mark the fifth
toot h . Refer to Figure 1 2- 1 8 .
Figure 1 2- 1 8 . Marking Tooth O n Crankshaft
Gear.
Camshaft - Locate the timing mark o n cam­
shaft . Starting with the land next to the timing
five (5)
mark, count
wise d irection . Mark the fifth lan d . Refer to
Figure 1 2-1 9 .
f ive (5) teeth in a
counterclock­
lands i n a