Chevrolet CHEVY VAN G10 SERIES Service Manual page 340

Vehicles
Trucks
All
f With vaccum advance
* W ithout vacuum advance
a. On high step
b. On second step
N O T E : R efer to " A d d itio n a l E x ter n a l S e ttin g s and A d ju s tm e n ts " / or " Id le S to p S o le n o id
A d ju s tm e n t an d " C .E .C . V a lv e A d ju s tm e n t" , as a p p lic a b le , in S e c t io n 6M (S e r v ic e
M an u a l), u n d er c a r b u re to rs b e fo r e u sin g th e f o llo w in g ch arts.
_____________ N O T E : A ll Id le S p e e d s L isted A re T o Be S et W ith A ir C o n d itio n in g O F F .
EQUIPMENT
Transmission
Manual
-6
L
(N eutral)
C.I.D.
-8
V
C.I.D.
-8
V
C.I.D. (LS-9)
A utom atic -6
L
(In Drive)
C.I.D.
Neutral for H/D
-8
V
C.I.D.
-8
V
C.I.D. (LS-9)
(1 ) Idle adjustm ent for vehicles equipped w ith A .I.R . is:
(2 ) With A .I.R . operating (if so equipped).
(3 ) Set low idle, using idle speed screw or solenoid alien head screw adjustm ent (w ith solenoid de-energized), at 4 5 0 RPM.
(4 ) CAUTION: If the C.E.C. valve (solen oid ) on the carburetor is used to set engine idle or is adjusted ou t o f lim its specified
in the Service Manual, decrease in engine braking m ay result.
L/D Light D uty, H /D
ADJUSTMENTS (CONT'D.)
Fast Idle (Running) RPM Adjustment
C a rb u reto rs — R o c h e ste r
MV
Auto. Man.
24001-
a.
NOTE: For vacuum advance for 1 bbl. carburetors - pull lead o f f o f cold override sw itch and ground it —
this w ill energize the C.E.C. valve.
OTHER ADJUSTMENTS
(See N ote Above)
Colum n No. 1
Initial Curb
Idle Speed
Engine
(R.P.M .)
(Use Lean D rop M ethod - E xcept With A .I.R .)
250
800 (1)
775 (3 )
307
1000 (1)
7 0 0 ( 1 )
350 1000
250
6 3 0 ( 1 ) L/D
775 (3) H/D
307
650 (1)
7 0 0 ( 1 )
350
630 (1)
H eavy D u ty - See truck identification.
4 Q J
A uto
Man.
* *
* 1 8 5 0 (1 -1 /4 S A E ) These settings are approximate
1350
1500 * 2 2 0 0 (1 -1 /2 S .A .E ) wjtjj vjscous ciutch fans
b. b.
(See N ote Above)
C olum n No. 2
Final Curb
Idle Speed
L/D
H/D
L/D
H/D
1
( )
L/D
600 (3 ) (1)
H/D
1 /4 turn rich from lean roll (m ixture screw).
S P E C IF IC A T IO N S 9
2G V
A uto and Manual
„ . with low idle at
a. disengaged.
(See N ote Above)
Colum n No. 3
CEC Valve
Engine Speed
(R.P.M .)
(R.P.M.)
700 (3) 1000
900 (3 ) L/D
—
600 (3 ) H/D
900 (3)
—
600 (3) 650
700
-t-
— —
C H E V Y V A N SH O P M A N U A L
450
RPM —
(4)