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78
CHAPTER FOUR
square. Slight damage may be removed with a
silicon carbide oilstone. Use No. 100- 120 grit
initially, then polish with a No. 280-320 grit.
3.
Inspect the camshaft sprockets for damaged
teeth. Install new sprockets if damaged; note
the following:
a. The intake and exhaust sprockets are
identical; install the sprocket on the
camshaft, using the proper holes for each
cam (Figure 22).
b. The exhaust camshaft has a tachometer
drive gear machined into it
(B,
Figure 20).
c. The marked side of the sprocket faces the
end of the cam with a notch in it (Figure
23).
d. Use a locking agent such as Loctite Lock
N' Seal on the sprocket bolts and torque
them as specified in Table 2.
Camshaft/Bearing Clearance Inspection
To check camshaft journal/bearing surface
clearance with Plastigage, follow the
Camshafr
Installation
procedure, but leave the cam and
bearing surfaces
dry.
It is very important not to
turn the cams while assembled dry. After
checking clearance, remove and lubricate the
cams.
Installation
Whenever a camshaft has been removed, the
camshaft rotation must be retimed in relation
to crankshaft rotation or the engine will not
develop normal power. If the timing is too far
off, the valves could try to open when the
piston is at TDC (top dead center). Bent or
damaged valves and pistons could result.
1.
Remove the cam chain tensioner cross
wedge cap and spring; see
C a m Ch a in
Tensioner Removal
in this chapter.
2. Remove the tachometer bolt and pinion
holder stops at the cylinder head (Figure 24).
Pull the cable guide and tachometer drive gear
from the cylinder head. A gasket and oil seal
may come out with it.
3. Make sure the No. 1 and No. 4 pistons are
still at TDC; the
"T"
mark next to the No. 1 and
No. 4 " F mark should align with the index
mark (Figure 18).
Exhaust
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