Inspection Of Cam Shaft - TOHATSU MFS25 Service Manual

Power Unit

15) Inspection of Cam Shaft

1. Measure cam height. Replace if the height is less than
specified value.
Cam Height at Both Intake and Exhaust Sides a : Standard Value
25 : 23.87 mm ( 0.9498 in )
30 : 24.28 mm ( 0.9559 in )
Functional Limit : Cam Height at Both Intake and Exhaust Sides a
25 : 23.60 mm ( 0.9291 in )
30 : 24.00 mm ( 0.9449 in )
2. Measure cam shaft runout. Replace if the runout is over
specified value.
Cam Shaft Runout Limit :
0.05mm ( 0.0020 in )
Measure cam shaft journal outer diameters c and d.
3.
Replace cam shaft or cylinder head if either of the diameters
is less than specified value.
Cam Shaft Journal Outer Diameter c : Standard Value
17.98 mm ( 0.7079 in )
Cam Shaft Journal Outer Diameter d : Standard Value
15.97 mm ( 0.6287 in )
Cylinder Head Journal Inner Diameter e (Upper) :
18.010 to 18.025 mm ( 0.7091 to 0.7096 in )
Pulley Side Bearing Outer Diameter c :
17.95 mm ( 0.7067 in )
Oil Pump Side Bearing Outer Diameter d :
15.95 mm ( 0.6280 in )
Measure cylinder head journal inner diameter e and oil
4.
pump journal inner diameter f. Obtain oil clearances. They
are calculated as e – c and f – d respectively. Replace
cam shaft, cylinder head or oil pump if either of the
clearances is over specified value.
Oil Clearance : Standard Value
0.02 to 0.05 mm ( 0.0008 to 0.0020 in )
Functional Limit :
0.09 mm ( 0.0035 in )
If oil clearance is over functional limit, replace
any of cylinder head, cam shaft and oil pump or
all of them as a set, and check that the
clearance is within specified range.
5-38
d
e
f
a
c
e
25/30 2006