Chevrolet 70 1969 Series, Shop Manual

Page: 670 / 913

POW ER BRAKE 5-61
SPEC IFIC A TIO N S (CONT.)
AIR COMPRESSOR SPECIFICATIONS
( 7 1 / 4 - CUBIC FOOT)
R ing G a p .................................................................................................................................... 0 .0 0 2 "-0 .0 1 0 "
P isto n R in g C le a ra n ce (In G ro o v e )....................................................................................0 .0 0 3 0 "-0 .0 0 1 5 "
C o n n e ctin g Rod In se rts (In s id e D ia m e te r):
S ta n d a r d .................................................................................................................................. 1 .1 2 5 8 "-1 .1 2 6 3 "
.010 U n d e rsiz e ( R ) * .............................................................................................................1 .1 1 5 8 "-1 .1 1 6 3 "
.020 U n d e rsiz e ( Y ) * .....................................................................
1 .1 05 8 "-1.10 6 3"
.030 U n d e rsize ( G ) * .......................................................................................................... 1.095 8 "-1.09 6 3"
C le a ra n c e B e tw e en C o n n e ctin g Rod In se rt and C ra n k sh a ft Jo u rn a l 0.0021"
C ra n k s h a ft:
C o nn ectin g Rod Jo u rn a l D ia m e te r 1.124 2 "-1.12 5 0"
M ain B e a rin g Jo u rn a l D ia m e te r......................................................................... 1.377 9 "-1.37 8 3"
M ain B e a rin g O u tsid e D i a m e t e r ..................................................................... .2 8 34 1 "-2.83 4 6"
M ain B e a rin g In sid e D i a m e t e r ........................................................................................ 1 .3 77 5 "-1.33 8 0"
M ain B u sh in g Jo u rn a l D ia m e te r .............................................. —
M ain B u sh in g (F ro n t) In sid e D ia m e te r —
C ra n k sh a ft B e a rin g In se rt ( R e a r ):
In sid e D ia m e te r 1.3 80 "-1 .3 82 "
C ra n k sh a ft Jo u rn a l M a xim u m O ut-of-Round . 0 .001"
U n lo ad er V a lv e S p rin g :
Free H eig ht ............................................................................................ 3/4 " . .
H eight U nd er a Load of 5 lb s. 9 1/? oz. to 6 lb s. 131/? oz. 15/ 32" .
♦Color Id e n tifica tio n M a rk s R -R ed , Y - Y e llo w , B - B lu e , G -G reen
0
.
002
" -
0
.
010
"
0.0 03 0 "- 0.0015'
1.1258"- 1.1263'
1.1158"- 1.1163'
1.1058"- 1.1063'
1.0958"- 1.0963'
0 .0 02 1 "
1.1242"- 1.1250'
1 .3 77 9 "-1.37 8 3"
1 .3 77 5 "-1.37 8 0"
1 .3 8 0 "-1 .382"
0
.
001
"
* % 2 "
AIR COMPRESSOR SPECIFICATIONS
(12 - CUBIC FOOT)
M O D E L N O .
C a p a city (A t 1250 R P M ) ..........................................
C y lin d e r B o r e ...............................................................
S t r o k e ...............................................................................
In le t V a lv e S e a t— W orn G roove Not to Exceed
Inlet Valve Spring:
Free H e ig h t .........................................................
Under a Load of (3.3 oz. to 2.7 oz.)..................................
Discharge Valve Seat— Worn Groove Not to Exceed....................
Discharge Valve Spring:
Free H e ig h t .........................................................
Under a Load of
(%
lbs. to
%
lbs.)........................................ 1.072".........
Piston Diameter:
Standard................................................................... 2.4980"-2.4985"
.010
Oversize............................................................... 2.5080" 2.5085"
.020 Oversize............................................................... 2.5180"-2.5185"
.030
Oversize............................................................... 2.5280"-2.5285"
Piston Pin Bore...............................................................0.5311"-0.5130"
Piston Pin:
Diam eter................................................................... 0.5310"-0.5312"
Length.....................................................................
25/w"
..........
Piston Rings:
Standard................................................................... 2.4995"-2.5000"
.010
Oversize ( Y ) * ............................................................. 2.5095" 2.5100"
.020 Oversize ( B ) * ......................................................... 2.5195"-2.5200"
.030
Oversize (G ) * ......................................................... 2.5295 ' 2.5300"
Ring G ap..................................................................... 0.002"-0.010"
Piston Ring Clearance (In Groove):
Wide R in g .................................................................. 0.0035"-0.0055"
Narrow R in g ............................................................... 0.002"-0.004"
B E L T D R I V E N
G E A R D R I V E N
276113 279651
276111 280095
276840 280267
276915
279580 280500
279921
12 C u. F t................................
..................... 12 C u . Ft.
2 .5 0 0 " .....................................
. . 2 .5 0 0 "
1 % "
.................
............. I n/l6"
0 .0 0 3 " ........................................ .................. 0 .0 03 "
0 6 3 7 0 "-0 .6 4 3 0 ".....................
................ 0 .6 3 7 0 "-0 .6 4 3 0 "
W u "
..................
.................... a / 6 4 "
% "
.................... .........
3 / s "
0 .0 0 3 " ..................................... 0 .0 03 "
l 7 / 6 4 "
l 7/6 4 "
1.072"
2 .4 9 8 0 "-2 .4 9 8 5 "
2 .5 0 8 0 "-2 .5 0 8 5 "
2 .5 1 8 0 "-2 .5 1 8 5 "
2 .5 2 8 0 "-2 .5 2 8 5 "
0 .5 3 1 1 "-0 .5 1 3 0 "
0 .5 3 1 0 "
25
/
16
"
0 .5 3 1 2 "
2 .4 9 9 5 "-2 .5 0 0 0 "
2 .5 0 9 5 "-2 .5 1 0 0 "
2 .5 1 9 5 "-2 .5 2 0 0 "
2 .5 2 9 5 "-2 .5 3 0 0 "
0 . 002 " - 0 . 010 "
0 .0 0 3 5 "-0 .0 0 5 5 "
0 .0 0 2 "-0 .0 0 4 "
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L