Chevrolet 70 1969 Series, Shop Manual

Page: 669 / 913

POWER BRAKE 5-60
COMPRESSOR TESTS AFTER OVERHAUL
NOTE:
The fo llo w in g a p p lie s to m a k in g test
w ith s h o p e q u ip m e n t, but it can be readily
a d a p t e d to te stin g in vehicle:
A com paratively simple com pressor efficiency or built-
up test can be run. The com pressor must be connected to
an oil supply line of at least 15 pounds pressure during
the test and an oil return line m ust be installed to keep
crankcase drained. The com pressor (when tested) should
be tested without a strainer.
T o the discharge port of the com pressor connect a res­
ervoir whose volume, plus the volume of the connecting
line, equals 1300 cubic inches. R un the com pressor be­
tween 1700 and 1750 rpm . Elapsed tim e that the com pres­
sor takes to build up from 0 to 100 psi depends on the
type com pressor as follows:
During the above test the com pressor should be checked
for oil leakage and noisy operation.
SPECIFICATIONS
M ake
M odel
T a g No.
C ut-O u t P re s s u re
C u t-in P re s s u re .
E x h a u s t S te m S p rin g
Free Leng th
P re s s u re S e ttin g
S p rin g :
F re e Leng th
In le t V a lv e S p rin g :
Fre e Length
GOVERNOR SPECIFICATIONS
B e n d ix -W e s tin g h o u s e ....................... B e n d ix -W e s tin g h o u s e ................ B e n d ix -W e stin g h o u se
D -2 ..........................................................
243106, 244874, 243710, 244814,
244609, 243 1 11 , 243123
103-111 psi .....................................
.8 6 -9 0 p s i..............................................
..................................
-
123
/
32
"
D-2
243126 . .
118-126 psi
98-104 psi
.
.1 % ".
D-2
243104
.123-131 psi
105-108 psi
■
1 % "
, . 53/64"
AIR COMPRESSOR SPECIFICATIONS
(7 1/4 - CUBIC FOOT)
BELT DRIVEN GEAR DRIVEN
MODEL NO. 278646 279318 280094
279589
C a p a city (A t 1250 R P M ) 7>/i C u . F t. 1 % C u . Ft.
C y lin d e r B o re 2 l/m " Z V u "
S tro k e I 1/ / ' .......................................................... ................ V / 2 "
In le t V a lv e S e a t— W orn G roove Not to E xce e d 0 .0 0 3 “ 0 .0 0 3 "
In le t V a lv e D ia m e te r 0 .6 3 7 " - 0 .6 4 3 0 ''............................................................. 0 .6 3 7 "-0 .6 4 3 0 "
In le t V a lv e S p rin g :
Fre e H eight . . . ....................................................... 2% 4 "
U n d e r a Load of (3 .3 oz. to 2 .7 o z .) % "
D isch a rg e V a lv e S e a t - W o r n Groove Not to Exceed ....................... 0 .0 0 3 " 0 .0 0 3 "
D isch a rg e V a lv e S p rin g :
F re e H eig h t ' 1 % 4" ....................................................... i y 64"
U n d e r a Lo ad of ( lA lb s. to 3/ i lb s .) 1 .072" 1 .072"
Piston D ia m e te r:
S ta n d a rd ................................ 2 .0 6 1 0 "-2 .0 6 1 5 " 2 .0 6 1 0 "-2 .0 6 1 5 "
.010 O v e rsize 2 .0 7 1 0 "-2 .0 7 1 5 " 2 .0 7 1 0 "-2 .0 7 1 5 "
.020 O v e rsize 2 .0 8 1 0 "-2 .0 8 1 5 " 2 .0 8 1 0 "-2 .0 8 1 5 "
.030 O v e rsize 2 .0 9 1 0 "-2 .0 9 1 5 " 2 .0 9 1 0 "-2 .0 9 1 5 "
P isto n Pin B o re 0 .5 0 0 1 "-0 .5 0 0 3 " 0 .5 0 0 1 "-0 .5 0 0 3 "
Pisto n P in :
D ia m e te r 0 ,5 00 0 "-0-5 0 02 ” 0 .5 0 0 0 "-0 .5 0 0 2 "
Length . 1 % " 1 % "
Pisto n R in g s :
S ta n d a rd 2 .0 6 2 0 "-2 .0 6 2 5 " 2 .0 6 2 0 "-2 .0 6 2 5 "
.010 O v e rsize ( Y ) * 2 .0 7 2 0 "-2 .0 7 2 5 " 2 .0 7 2 0 "-2 .0 7 2 5 "
.020 O v e rsize ( B ) * 2 .0 82 0 "-2 0 825" 2 .0 8 2 0 "-2 .0 8 2 5 "
.030 O v e rsize (G )* 2 .0 9 2 0 "-2 .0 9 2 5 " 2 .0 9 2 0 "-2 .0 9 2 5 "
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SHO P M A N U A L