Chevrolet 70 1969 Series, Shop Manual

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E N G IN E 6-9
S h a ft
(J -2 1 0 9 9 -9 )
A d a p t e r
U - 2 1 0 9 9 -4 ) [ \ ^
C a m s h a ft
Front B e a r in g
E S
C -W a s h e r
(J -2 1 0 9 9 -1 2 )
D r iv in g Button
(J-2 1 0 9 9 -1 1 )
V IE W A - R E M O V I N G N o . 1 B E A R IN G
D r iv in g Button
tsg
D O W EL P IN S
Examine two dowel pins at rear surface of cylinder
block for looseness or damage. Also inspect and check for
looseness, the dowel pins (fig. 9) at crankshaft thrust
bearing cap and at front of cylinder block. Loose or d a m ­
aged dowel pins must be replaced.
CRA N K SH A F T B E A R IN G IN SPECTIO N
Visually inspect each camshaft bearing for scoring,
wear, or looseness. To determine clearance at each bear­
ing, measure camshaft journals and bearing inside diam e­
ters with micrometers.
C A M SH A F T B E A R IN G REPLACEMENT
-4) in camshaft No. 1 (front)
bearing, then with C-washer (J-21099-12) in groove in
shaft (J-21099-9) and driving button (J-21099-11)
screwed into front end of shaft, drive out front bear­
ing (View A, fig. 12). Use h a m m er and chisel to col­
lapse the front bearing to permit removal through
opening in valve lifter compartm ent.
2. Remove No. 2 camshaft bearing with shaft, driving
button, and C-washer in same m anner as described in
step 1 for removing No. 1 bearing except as follows:
Insert front pilot (J-21099-13) into No. 1 bearing
bore as shown in View “ B ‘ of Figure 12, and use
adapter (J - 2 1099-5) to drive No. 2 bearing out to­
ward rear.
3. Remove No. 3 bearing with equipment shown in View
“ B" of Figure 12. Attach adapter (J-21099-6) to end
of shaft with bolt and washer and drive bearing out
toward rear.
Figure 1 2 — R e m o v in g C a m s h a f t B e a r in g s w ith Tool Set (J -2 1 0 9 9 -1 5 )
1. Insert adapter (J-21099
Pre-sized camshaft bearings are available for service re­
placement for all V-6 engines. These bearings provide
proper fit when installed without reaming.
Special tool set (J-21099-15, fig. 10) is required to re­
move camshaft bearings and to install new bearings. Vari­
ous items referred to in text are identified by respective
part numbers in Figure 10.
The procedure which follows is required to replace the
camshaft bearings. Refer to chart on next page which lists
tools for each operation. It is recom m ended that all c a m ­
shaft bearings be removed before installing any of the new
bearings.
C A M S H A F T B E A R IN G R E M O V A L
The plug or plate used to close the camshaft bearing
bore hole at rear of cylinder block must be removed to
permit access to the camshaft rear bearing.
Figure 1 3 — C a m s h a f t B e a r in g In stallation
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L