Chevrolet 70 1969 Series, Shop Manual

Page: 697 / 913

E N G IN E 6-26
Figure 3 9 — T im in g G e a r s a n d Fuel P u m p Eccentric Installed ( 4 0 1 M a n d
4 7 8 M E n gin e s)
NOTE: When side seals are fully inserted, ex­
posed end will protrude approximately 0.030
inch beyond surface of bearing cap. DO NOT
CUT OFF SIDE SEALS.
8. Install the two bolt hole plugs in rear bearing cap to
seal holes and prevent leakage. Figure 37 shows seal­
ing arrangement at crankshaft rear bearing and cap.
TIMING IDLER GEAR AND SHAFT
INSTALLATION (401M and 478M Engines)
NOTE: Refer to Figure 7.
1. Locate idler gear shaft (2) at cylinder block with
mounting bolt holes aligned.
2. Start bolts (4) with lockwashers, then with soft h a m ­
mer drive the shaft squarely into place. Shaft pilot is
light press fit in block.
3. Tighten shaft mounting bolts.
4. Turn camshaft and crankshaft so timing marks on
gears are toward idler gear shaft, then install timing
idler gear with timing marks on idler gear indexed
with m arks on mating gears as shown in Figure 39.
Install idler gear retainer plate and secure with two
bolts and lock plate. Tighten bolts and bend corner of
lock plate against one flat at each bolt head.
Block crankshaft to prevent turning, then with torque
wrench, tighten fuel pum p eccentric bolt to 50 to 60
foot-pounds.
5
6.
Figure 4 0 — C ross Section at C a m s h a f t a n d Fuel P u m p Eccentric
1. Front Cover
2. Cylinder Block Cap
3. Cap Gasket
4. Camshaft
5. Camshaft Thrust Plate
6
. Spacer
7. Washer
8
. Fuel Pump Eccentric
9. Bolt
10. Woodruff Key
Figure 4 1 — Tool for In sta llin g Pulley or Pulley H u b on C r a n k s h a ft
FRONT COVER INSTALLATION
1. Place oil slinger (6, fig. 27) on crankshaft (if slinger
was removed) and install pulley key.
2. Install cylinder block cap (2, fig. 40) on top of cylin­
der block in front of valve lifter com partm ent, using
gasket between cap and block. Use flat steel washer
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M A N U A L