Timing Belt And Water Pump; Checking Timing Belt Tension; Timing Belt Adjustment; Camshaft Timing Sprocket - Pontiac TRANS AM 1977 Service Manual

140 ENGINE 6A 1-5
4. Connect battery negative cable and close hood.
TIMING BELT AND WATER PUMP
Removal
Installation
1. Clean gasket surfaces and loosely install water pump,
using a new gasket.
NOTE: Apply an approved anti-seize compound to the
water pump retaining bolts before installing.
Fig. 6A1-5 Sprocket Alignment Marks
I
C U N K S W F l
VULICY
4533
Fig. 6A1-6 Timing Sprocket Alignment Marks
1. Remove engine front cover and accessory drive pulley
as previously outlined.
2. Drain engine coolant and loosen water pump bolts to
relieve tension in timing belt.
3. Remove the timing belt lower cover; then remove
timing belt from camshaft and crankshaft sprockets.
4. Disconnect water pump outlet hose, remove water
pump retaining bolts and remove water pump.
2. Align timing mark on cam sprocket with notch on
timing belt upper cover (Fig. 6A1-5)
3. Align crankshaft sprocket timing mark with cast tag
on oil pump cover. (Fig. 6A1-6).
4. Install timing belt on crankshaft sprocket; position
back of belt in water pump track; then install belt to camshaft
sprocket, making sure that both timing sprockets maintain
their indexed positions.
5. Install timing belt lower cover. Adjust belt tension as
described under "Timing Belt Adjustment".
6. Fill engine cooling system, install accessory drive
pulley, adjust accessory drive belts to specifications and
install engine front cover.
Checking Timing Belt Tension
Check timing belt for correct tension, using timing belt
tension gage Tool J 26486 as follows:
1. Loosen (but do not remove) the two engine front cover
lower screws; cover is slotted.
2. Remove the two cover upper retaining screws and
position cover to one side to permit access to timing belt.
3. Position timing belt tension gage onto timing belt so
that center prong is between cogs and feet of the gage are on
grooved side of belt.
4. Press and release the gage rapidly while positioned on
the belt until indicated tension value reading is constant.
NOTE: If gage reading does not fall within the listed
operating range then readjust the timing belt to the
adjustment specification.
5. Reinstall engine front cover.
TIMING BELT ADJUSTMENT
Proper belt tensioning is accomplished by use of a foot
pound torque wrench and belt tension adapter Tool J 23654.
1. Drain cooling system to prevent loss of coolant as
water pump is loosened in Step 4.
2. Remove engine fan and extension.
3. Remove engine front cover.
4. Loosen water pump retaining bolts.
5. Position Tool J 23654 in gage hole adjacent to left side
of water pump (Fig. 6A1-8).
6. Apply 15 Ibs. ft. of torque to water pump as shown
in Figure 6A1-9. Tighten water pump bolts to 15 lbs. ft. while
maintaining torque on side of pump.
7. Reinstall engine front cover, fan and extension, and
fill cooling system.
CAMSHAFT TIMING SPROCKET
Removal
1. Disconnect negative cable at battery.