Chevrolet CAMARO 1979 Service Manual page 734

6E-24 ENGINE EMISSION CONTROLS
4. Remove pulley to hub bolts ând remove pulley.
5. Remove pump.
lnstallation
1. Position pump assembly on mounting brâcket with
holes lin€d up ând instâll bolts loosely.
2. Place pulley on hub and tighten pulley to hub bolts
to 72-108 Ib. in.
3. Instâll pump belt over Pulley.
4. Move pump until belt is tightened to 60-85 lbs. and
tighten bracket bolts.
5. Connect âll hoses to pump.
T R A P P E D V A C U U M S P A R K A D V A N C E
ODeralion of this system improves engrne wârm-up on
heavv àcceleration. A vacuum delav unil is located in lhe
vâcuum âdvance line ând connected to the distributor
Thermal Vacuum Switch (TVS) by two short hoses When
ensine coolânr temperâIure is below 100'F {J8'Ct. lull
uaèuum signal is supplied through a delay valve lo the
distributor when manifold vacuùm is increasina:. À smâll
odfice is orcvided iû the delay vâlve to allow for a leakdown
V A C U U M A D V A N C E D E L A Y
E M I S S I O N H O S E R O U T I N G
Emission hose routing Figs. 6E-34 through 6E-36 âre
shown for reference information only Use the Vehicle
Emission Control Informâtion Label for the most up to date
infornâtion concerning hose routings and tune up data.
rate when marifold vacuum is decreâsing When coolant
temDerâture is above lOo'F (38'C), the TVS will op€n ports
I a;d 2 ofthe TVS and full vacuum will bv-pass the delav
valve through the TvS to the distributor'