Honda C65 - Crankshaft Inspection; Measuring Crankshaft Alignment; Measuring Axial Clearances; Timing Sprocket Teeth Root Contour

32
3. EN Gl N E
-
Figure 3- 74. Measu r• g c-r:-
,.,,.,__
0.::: "'1 · f/t=""'= ~
-
/
C ra nksh aft
Figure 3- 75. Meas ,· g C>t:O = =-=-=-==
Fig u re 3- 76 . Timing sprocket teeth - ro 9t co n our
13¢ +0.04 3
+ 0.016
1-- - ---- L ----- - (
0512
+o.oo2 .)
-~ -- - - --- - · +0.001
1
"
G
Rec ipro c atin g mas s= -[
b
Gy rat ing ma ss = L
W her e m= Total mass
G=
Ce•ter of g ravity
fi9ure 3- 77 , Connec tin9 rod
with the piston con be removed as a unit from
the left crankcase.
b .
Inspection
11 I Suppo rt the crankshaft on V blocks at bo th bear-
ings and measure the amount of runout. (Fig. 3- 7 4)
Standard Value Servi ceab le limit
L eft bearing
0.015 Rep la ce if ove r
To
tal web si de 10.0006 i n.) 0. 05 10.0020 in.)
r
unout
Right b earing 0.015
Replace if over
web side
10.0006 in .l 0. 05 10.0020 in.l
1 21 The clearance in the bearing is measured by
fixing the cranks haft on centers and moving the
bearing in the axial and vertical direction .
(Fig. 3-
75)
Standard Value Se r viceab le limit
Axi al 0.004-0.036 Replace if over
clearance 10 . 0002~0.001 in.) 0.1 10.004 in.l
Clea rance
0.010- 0.025 Replace if over
no rmal to
axis
10.0004~0. 00 1 in.l
0.05 10.002 [n.l
W hen the clearance in the axial direction becomes
excessive, the cranks
haft wi ll move from side to si de
when engine
is running and produ ce undesirable noises
as
wel l as causing un even wear to the cylinder, piston
and the timing gear. It will also sh orten the lif e of
he clutch.
If the clearance is too sma ll, it .;,.i ll cause a
decre as e in the power output and shorten the life of
he cranks haft .
'31 Cron k pin
0 · sd e dia
Stan dard Value
23.1 mm 10.91 in.)
+0.012 10.0005 in.l
-0 .002 10 .0001 in.l
0 .052~0 . 087
1 0.0020~0 . 0034 in.)
Serviceab le limit
Replace if und er
23.045 10.908 in.l
t lef t crankshaft sp ro cket root diameter. (Fig. 3.76)
S ond ard vo\ue-+25 . 24±0 . 025 (0.994±0.0011
Servic eab le Jimit -+ Replace if under 25.1910.991 in)
1 51 Right crankshaft sp li ne ploy
Stand ard vo lu e-+0.0 1 0-0.040 (0 0004-0 . 0020 in!
Ser
vic eable \i mit -+ Reploce if over 0.08 10 . 0032 in)
161 M ax imum cranks haft assembly r un out
S
tandard vo lu e -+ runout at web outer surface
0.05 TIR 10 .002 in!
Servic
eable limit->Reploce if ove r 0.2 (0.008 in)
IZ J,. Connecting rod sma ll end I. D. (Fig. 3-77)
+0 . 043
Standa rd volu e-+ 13mm+0 .0
16
(0
512
+0.002. )
· + 0.001 rn
S erviceab le limit -+ Rep loce if over 1 3.1 10.52 inl
181 Connecting rod sma ll .end to piston pin clearance
Standard vo\ue-+0.01 6-0 . 043 (0.001 -0 . 002 in)
Servicoble
limit -+ Reploce if over 0.08 10.0032 ;n)
191 Connecting r od sma ll end deflection.
Standard va lu e-+ 1 .5 (0.060 in)
S ervi c eab le limit -+ Reploce if o ver 3.0 (Q. 120 i n)