Chevrolet BEAUVILLE SPORTVAN G10 SERIES, Service Manual

Page: 135 / 350

ENG IN E 6-6
Fig. 1 0 —M a n ifo ld H eat C o n tro l V alve (T y p ic a l V 8 )
N O T E : If a com plaint of poor high speed p erform ­
ance exists on the vehicle, fuel pump tests described
in Section 6 M should be perform ed.
SERVICE COOLING SYSTEM
l . Inspect cooling system for leaks, w eak hoses, loose hose
clamps and correct coolant level, and service as required.
N O T E : A cooling system pressure test, as de­
scribed in "A d d itio n a l Checks and Adjustm ents" in
this section, may be perform ed to detect internal or
external leaks w ithin the cooling system.
CHECK A N D ADJUST ACCELERATOR LINKAG E
1. D isconnect accelerator ro d at carb u reto r th ro ttle lever.
2. H old c a rb u re to r th ro ttle lever in wide open position.
3. Pull accelerator rod to wide open position. (O n vehicles
eq uipped w ith Powerglide, pull through deten t.)
4. A djust accelerator ro d to freely en ter h old in carburetor
th ro ttle lever.
N O T E : Accelerator linkage is outlined in detail in
Section 6M .
5. C o n n ect accelerator ro d at th ro ttle lever.
SER VIC E CRANKCASE V E N T IL A T IO N
(FIGS. 11 and 12)
All engines have a “ Closed Positive” v entilation system
utilizing m anifold vacuum to draw fumes and contam inating
vapors in to the co m b u stio n cham ber where they are burned.
Since it affects every part o f the engine, crankcase ventilation
is an im p o rtn a t fun ctio n and should be u n d ersto o d and
serviced properly.
Fig. 11—C rankcase V e n tila tio n System s (In Line )
In a “ Closed Positive” ventilation system , air is drawn
through the engine, (th ro u g h a regulating valve Fig. 13) into
the m anifold, draw ing crankcase vapors and fum es w ith it to
Fig. 1 2 —Crankcase V en tilatio n System (V 8 )
C H E V Y V A N S H O P M A N U A L