Crankshaft Inspection; Measuring Crankshaft Alignment; Measuring Axial Clearances; Timing Sprocket Teeth Root Contour - Honda C50 Shop Manual

32
3. EN Gl
N E
-
Figure
3- 74.
Measur• g c-r:-
,.,,.,__
0.:::"' 1 · f/t=""'=~
-
/
C rankshaft
Figure 3- 75. Meas ,· g
C>t:O
= =-=-=-==
Figure
3- 76.
Timing sprocket teeth -ro9t con our
13¢ +0.043
+ 0.016
1--- - - - - L- - - - -- (
0512
+o.oo2 . )
-~----
- - -- · +0.001
1
"
G
Reciprocating mass= -[
b
Gyrating mass = L
W here m = Total m ass
G = Ce•ter of gravity
fi9ure
3- 77,
Connec tin9 rod
with the piston con b e r emoved as a unit from
the left crankcase.
b . Inspection
11 I Support the crankshaft on V blocks at both bear-
ings and measure the amount o f runout. (Fig. 3- 7 4)
Standard Va lue Serviceable limit
Left
bearing
0.015
Replace if ove r
To tal web sid e
10.0006
in.)
0.05 10.0020
in.)
runout
Right bearing
0.015 Replace if over
web side
10.0006
in.l
0.05 10.0020
in.l
1 21 The clearance in th e bearing is measured by
fixing the crankshaft on centers and moving the
bearing in the axial and vertical direction.
(Fig. 3- 75)
Standa rd Va lue Se rviceable limit
Axi al
0.004-0.036
Replace if over
cl ea rance
10 .0002~0.001
in.)
0. 1 10.004
in.l
Clea ra nc e
0.010- 0.025 Replace if over
no rma l t o
a xis
10.0004~0. 00 1
in.l
0.05 10.002
[n.l
W hen the clearance in the axial direction becomes
excessive, the crankshaft wi ll move from side to sid e
when engine is running and produce undesirable noises
as wel l as causing uneven wear to the cylinde r, piston
and the t iming gear. It will also shorten the life of
he cl utch.
If th e clearance is too sma ll, it .;,.ill cause a
decrease in the power output and shorten the life of
he crankshaft.
'31 Cronk pin
0
·sde dia
Standard Value
23.1
mm
10.91
in.)
+0.012 10.0005
in.l
-0.002 10.0001
i n.l
0 .052~0 .087
1 0.0020~0. 0034
in.)
Serviceable limit
Replace if under
23.045 10.908
in.l
t left crankshaft sp ro cket root diameter. (Fig. 3.76)
S ondard vo\ue-+25.24±0.025 (0.994±0.0011
Servi ceable J imit-+Replace if under 25.1910.991 in)
1 51 Right crankshaft spline ploy
Standard vo lue-+0.0 1 0-0.040 (0 0004-0.0020 in!
Serviceable \i mit-+Reploce if over 0.08 10.0032 in)
1 61 M aximum crankshaft assembly runo ut
Standard vo lue-+runout at web outer surface
0.05 TIR 10.002 in!
Servi ceable limit->Reploce if ove r 0.2 (0.008 i n)
IZJ,. Connecting rod sma ll end
I.
D. (Fig. 3-77)
+0.043
Standa rd vol ue-+ 13mm+0.0
16
(0
512 +0.002. )
· + 0.001
rn
Serviceable limit-+Rep loce if over 1 3.1 10.52 inl
181 Connecting rod sma ll . e nd to piston pin clearance
Standa rd vo\ue-+0.01 6-0.043 (0.001 -0.002 in)
Servicoble limit-+Reploce if over 0.08 10.0032 ;n)
191 Connecting rod sma ll end deflection.
Standard va lue-+ 1 .5 (0.060 in)
Serviceable limit-+Reploce if o ver 3.0 (Q. 120 i n)