Engine Mechanical; In-Line Engine; Engine Assembly - Chevrolet CHEVY VAN G10 SERIES Service Manual

G eneral D e sc rip tio n .....................................................................6-13
C om ponent R eplacem ent and A djustm ent .........................6-13

Engine Assembly .................................................................. 6-13

R e m o v a l...............................................................................6-13
In s ta lla tio n ..........................................................................6-15
M anifold A sse m b ly ................................................................6-16
R e m o v a l...............................................................................6-16
I n s ta lla tio n ..........................................................................6-16
R ocker Arm C o v e r ................................................................ 6-16
R e m o v a l...............................................................................6-16
In s ta lla tio n ..........................................................................6-16
Valve M echanism .................................................................. 6-16
R e m o v a l...............................................................................6-16
Installation and A d ju s tm e n t..........................................6-16
Valve L if te r s ............................................................................ 6-17
Locating Noisy L i f t e r s ....................................................6-17
R e m o v a l...............................................................................6-17
In s ta lla tio n ..........................................................................6-17
Valve Stem Oil Seal an d /o r Valve Spring ...................... 6-18
R eplacem ent .....................................................................6-18
C ylinder H ead A sse m b ly ...................................................... 6-18
R e m o v a l.............................................................................. 6-18
I n s ta lla tio n ..........................................................................6-18
Oil P a n ...................................................................................... 6-19
R e m o v a l........................................................... ................... 6-19
I n s ta lla tio n ..........................................................................6-19
The In-Line engine covered in this section is the 250 cu. in.
6
L engine used in 10, 20 and 30G-Series truck.
This section covers the removal and installation o f engine
assemblies, th e rem oval, installation and adjustm ent o f some
sub-assemblies and replacem ent o f some com ponents. For
service to all com ponents and sub-assemblies (after removal)
and removal o f some sub-assemblies, refer to Section
Chassis Overhaul Manual.
COMPONENT REPLACEMENT AND ADJUSTMENT
ENGINE ASSEMBLY
Removal
1. Remove engine cover and position it o ut o f way.
2. Disconnect b attery ground cable at engine block and at
battery.
3. Drain cooling system and disconnect heater hoses at
engine; disconnect radiator hoses at radiator.
4. Disconnect autom atic transm ission cooler lines at radi­
ator.
' "
ENGINE M ECHANICAL

IN-LINE ENGINE

INDEX
Page
GENERAL DESCRIPTION
engine sub-assemblies and parts, typical illustrations and
procedures are used (except where specific illustrations or
procedures are necessary to clarify th e operation). A lthough
illustrations showing bench operations are used, m ost single
operations, w hen n o t p art o f a general overhaul, should be
6
o f this perform ed (if practical) w ith th e engine in th e vehicle.
5.
6
. D isconnect oil pressure gauge, if so equipped.
7.
8
9.
10.
t 4
Oil Pum p .................................................................................6-19
R e m o v a l.............................................................................. 6-19
I n s ta lla tio n ......................................................................... 6-19
Oil Seal (Rear M a in ) ............................................................. 6-20
Replacem ent .....................................................................6-20
Torsional D a m p e r ................................................................6-21
R e m o v a l.............................................................................. 6-21
In s ta lla tio n ......................................................................... 6-21
Crankcase F ro n t C o v e r ........................................................ 6-21
R e m o v a l.............................................................................. 6-21
I n s ta lla tio n ......................................................................... 6-22
Oil Seal (F ro n t Cover) ........................................................ 6-22
Replacem ent ................................ ....................................6-22
Cam shaft .................................................................................6-22
Measuring Lobe L i f t ...................... ..................... ............6-22
R e m o v a l............................................................................ .. 6-23
In s ta lla tio n ......................................................................... 6-23
Timing Gears ......................................................................... 6-23
R eplacem ent .....................................................................6-23
F ly w h eel................................................................................... 6-23
R e m o v a l.............................................................................. 6-23
In s ta lla tio n ..........................................................................6-23
Engine M o u n ts ..........................................................................6-24
Checking Engine M o u n ts ................................................. 6-24
R eplacem ent (F ro n t) ...................................................... 6-24
Replacem ent (R ear) ........................................................ 6-25
Because o f the interchangeability and sim ilarity o f m any
Remove fan guard and radiator.
Disconnect engine wiring harness at dash panel junction
block.
. D isconnect D elcotron wires at rear o f D elcotron.
D isconnect TCS system electrical leads at carburetor
m ounted CEC valve and at tem p erature sw itch-rem ove
harness from clips and position it to one side.
Disconnect Evaporation C ontrol System lines a t rocker
arm cover and at c a rb u re to r-p o sitio n lines to one side.
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ENG INE 6-13
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C H E V Y V A N SHOP M A N U A L