NOISY VALVE LIFTERS
a.
Check for broken valve springs and replace as
necessary.
b.
Check for worn or sticking rocker arm s and
re p a ir or replace as necessary.
c.
Check for worn or bent push rods and replace as
necessary.
d.
Check for valve lifters incorrectly fitted to bore
size and correct as necessary.
e.
Check faulty valve lifter plunger or push rod
seat an d replace lifters as necessary.
f.
Check for plungers excessively w orn causing fast
leakdown und er pressure and replace as necessary.
g.
Check for excessively w orn cam sh aft lobes and
replace if necessary.
h.
Check valve lifter oil feed holes plugged causing
internal breakdow n and correct as necessary.
i.
Check faulty valve lifter check ball, (nicked, flat
spot, or out o f round) and replace as necessary.
j.
Check rocker arm retaining nut to be installed
upside dow'n and correct as necessary.
k.
Check for end o f push rod excessively worn or
flaked and replace as necessary.
6 C y lin d er Engine
Contents
G e n e ra l D e s c r ip tio n ....................................................... 6A-7
Engine L u b r ic a tio n ......................................................... 6A-8
O n Vehicle S e rv ic e ......................................................... 6A-15
E ngine M o u n t s .............................................................. 6A-15
M a n ifo ld A ssem bly-N on-Integrated H e a d ........... 6A-16
Exhaust M anifold-Integrated H e a d ........................ 6A-16
Rocker A rm C o v e r ....................................................... 6A-17
Valve M e c h a n is m .......................................................... 6A-17
Valve Stem Oil Seal a n d / o r Valve S p r in g ........ 6A-17
Valve L i f t e r s ................................................................... 6A-18
C ylinder H e a d ............................................................... 6A-20
Rocker Arm S t u d s ........................................................ 6A-22
Valves................................................................................ .6A-24
Torsional D a m p e r ......................................................... .6A-24
Crankcase F ro n t C o v e r .............................................. .6A-25
Oil Seal (F ront C o v e r)............................................... .6A-26
C a m s h a f t .......................................................................... .6A-27
C a m sh a ft Bearings.........................................................6A-29
Oil P a n ............................................................................. .6A-30
Oil P u m p ........................................................................... 6A-30
Connecting Rod B e a rin g s.......................................... .6A-31
C ran k sh aft M ain B e a rin g s .........................................6A-32
Oil Seal (R ear M a i n ) ................................................. .6A-35
Piston and C onnecting Rod A ssem blies.............. .6A-36
Engine A ssem bly........................................................... .6A-40
C r a n k s h a f t .........................................................................6A-41
GENERAL DESCRIPTION
CYLINDER BLOCK
The cylinder block is m ade o f cast iron and has 6
cylinders a rra nge d "In -L in e " . Seven main bearings
support the cra n k sh a ft which is retained by recessed
b earing caps that are m achined with the block for
p ro p e r alignm ent and clearances. Cylinders are com
pletely encircled by coolant jackets.
CYLINDER HEAD
T he cast iron cylinder head provides a compression
ratio o f 8.3:1. It is cast with individual intake and
exhaust ports for each cylinder. Valve guides are integral
an d rocker a rm s are retained on individual threaded
studs pressed into head. Most 250 heads have integrated
inlet m anifold while the 292
uses separate inlet
manifolds.
CRANKSHAFT AND BEARINGS
The crankshaft is cast nodular iron and is supported
by seven m ain bearings. N u m b e r seven bearing is the
end thrust bearing. M ain bearings are lubricated from
oil holes which intersect the main oil gallery located on
the right side o f the block. The cam bearings are also fed
oil by intersecting holes with m ain oil gallery. The lifters
are located in the m ain oil gallery.
A d a m p e r assembly, on the forward end o f the
crakshaft, dam pens any engine torsional vibrations. The
Summary of Contents for 1977 light duty truck
Page 1: ......
Page 28: ......
Page 70: ...Fig IB 24 Four Season System Vacuum Diagram C K Models 1B 24 LIGHT TRUCK SERVICE M A N U A L...
Page 71: ...Fig lB 25 Overhead System Wiring Diagram C K Models AIR C O N D ITIO N IN G 1 B 2 5...
Page 72: ...Fig IB 26 C60 System Wiring Diagram G Models...
Page 74: ......
Page 75: ...Fig lB 29 Motor Home Chassis Wiring Diagram THERMOSTATIC SWITCH AIR C O N D ITIO N IN G IB 2 9...
Page 106: ......
Page 128: ......
Page 129: ...Fig 2D 5 Typical 05 and 0 6 Vans...
Page 136: ......
Page 148: ...Fig 2D 51 Rear Door Controls...
Page 158: ...Fig 2D 79 Folding Top Assembly...
Page 159: ...Fig 2D 80 Folding Top Side Moldings and Header...
Page 161: ...Fig 2D 85 Dnver s Bucket Seat 14 Fig 2D 86 Passenger s Bucket Seat 14...
Page 162: ...Fig 2D 89 Rear Folding Seat 06 Fig 2D 9 0 Rear Bench Seat 14...
Page 163: ......
Page 164: ......
Page 165: ......
Page 185: ......
Page 186: ......
Page 190: ......
Page 225: ......
Page 226: ......
Page 248: ...Fig 3B 77 Removing Bearing Housing Pivot Pins Fig 3B 79 Replacing Lock Bolt Spring...
Page 278: ...C 10 G 10 20 C 20 30 G 30 P 10 30 9 Fig 3C l Front Suspension C P Series...
Page 284: ...BALL JOINT DIAGNOSTIC PROCEDURE...
Page 316: ......
Page 321: ...Fig 3D 12 Rear Spring Installation G Models...
Page 322: ......
Page 325: ......
Page 326: ......
Page 336: ......
Page 352: ......
Page 378: ......
Page 395: ...Fig 5 2 Front Brake Pipes and Hoses C K Models...
Page 396: ......
Page 397: ...Fig 5 4 Front Brake Pipes and Hoses P Models BRAKES 5 1 3...
Page 400: ......
Page 401: ...V 8 N 4 0 L 6 N 4 0...
Page 402: ......
Page 404: ......
Page 405: ...P300 42 M40 JB9...
Page 438: ......
Page 448: ...Fig 6A 4 P Series Engine Rear Mount...
Page 451: ...Fig 6A 8 K Series Engine Rear Mount...
Page 452: ...ENGINE M O U N T BRACKET ALL K SERIES W ITH L 6 ENGINE 6A14 LIGHT TRUCK SERVICE M A N U A L...
Page 483: ...FUEL PUMP PUSH ROD OILING OIL F LTER AND BY PASS VALVE...
Page 484: ...FUEL PUMP PUSH ROD OILING CRANKCASE AND CRANKSHAFT OILING VALVE MECHANISM OILING...
Page 487: ......
Page 488: ...MOUNT VIEW A V AUTOMATIC TRANSMISSION FRONT MANUAL TRANSMISSION...
Page 489: ......
Page 490: ......
Page 568: ......
Page 602: ......
Page 605: ......
Page 612: ...Fig 6D 3i High Energy Ignition Basic W iring...
Page 644: ......
Page 648: ...DISTRIBUTOR VALVE Fig 6E 3 Vacuum Hose Schematic L6 292 CID Calif HD Emissions...
Page 649: ...V A LV E Fig 6E 5 Vacuum Hose Schematic V8 305 CID HD Emissions...
Page 650: ...Fig 6E 7 Vacuum Hose Schematic V8 350 CID High Altitude Calif LD Emissions...
Page 651: ...VALVE Fig 6E 9 Vacuum Hose Schematic V8 350 400 CID Except Calif HD Emissions...
Page 652: ...CANISTER...
Page 653: ...PCV V AL VE Fig 6E 13 Vacuum Hose Schematic V8 454 CID Except Calif HD Emissions...
Page 672: ...Fig 6E 29 Air Cleaner 305 350 400 V8 CK...
Page 682: ......
Page 692: ......
Page 700: ...Fig 7A 6B Detent Downshift Cable C K and P Series...
Page 709: ...Fig 7 A 12B CBC 350 Hydraulic Circuit A U TO M A T IC T R A N S M IS S IO N 7 A 1 7...
Page 743: ...VIEW B FLAT IvEwfDl l6 G tO 2 GAGE...
Page 744: ......
Page 755: ...V I E W B WITH AUTOMATIC TRANSMISSION WITH MANUAL TRANSMISSION V I E W A...
Page 760: ...r...
Page 766: ......
Page 767: ...V I E W D 1 6 ENGINE VIEW V 8 ENGINE...
Page 768: ......
Page 775: ......
Page 788: ......
Page 794: ...G A S G A U G E...
Page 805: ......
Page 836: ...Fig 8 58 Seat Belt Reminder System Schematic...
Page 844: ...C H E C K n...
Page 852: ......
Page 853: ...SPECIAL TOOLS J 2 3 5 2 0...