GMC S Series 1994, Руководство по ремонту

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DISASSEMBLY OF THE ENGINE
TOOLS AND SHOP EQ UIPM ENT
A clean well-lit work area should be available. Other
necessary equipment includes: a suitable parts cleaning
tank, compressed air supply, trays to keep parts and
fasteners organized, and an adequate set of hand tools.
An approved engine repair stand will aid the work and
help prevent personal injury or component damage.
Special tools are listed and illustrated throughout this
section with a complete listing at the end of the section.
These tools (or their equivalents) are specially designed
to quickly and safely accomplish the operations for
which they are intended. The use of these special tools
will also minimize possible damage to engine compo­
nents.
Some precision measuring tools are required for
in sp e ctio n of ce rta in c ritic a l com ponen ts. Torque
wrenches are necessary for the correct assembly of
various parts.
ACCESSORY REMOVAL
The various procedures in this manual assume that
the engine accessories have been removed. These
accessories may include one or more of the following:
• Hydraulic Pump
• Generator
• Air Conditioning Compressor
• Cooling Fan
• Distributor
• TBI Unit
It is beyond the scope of this section to cover in detail
the many different accessory installations. Refer to the
appropriate Truck Service Manual for this information.
Diagrams of emissions and vacuum hose routings,
wiring harness routing, accessory drive belt layout, etc.
should be found before removing accessories.
CLEANING
Remove the engine accessories before cleaning, to
provide better access to the engines exterior surfaces.
After removing the TBI unit, distributor, etc., cover the
openings with tape to prevent the entry of contami­
nants.
Methods used to clean the engine will depend on the
means which are available. Steam cleaning, pressure
washing, or solvent cleaning are some of the accept­
able methods. Allow the engine to dry thoroughly before
beginning any work.
It is important that the engine be as clean as possible
to prevent dirt, coolant, or any other contaminants from
entering critical areas during disassembly.
D RA IN ING TH E ENGINE
++
Remove or Disconnect
1. Oil pan drain plug and washer.
• Allow the oil to drain into a proper container.
2. Oil filter.
3. Coolant drain plug and or knock sensor from the
block.
• Allow the coolant to drain from the block into a
proper container.
-►4-
Install or Connect
NOTICE: For step s 1 and 2 refer to “Notice’
on page 6A3-1.
1. Oil pan drain plug and washer.
• Drain plug to 25 N-m (18 lbs. ft.).
2. Coolant drain plug and or knock sensor into the
block.
Tighten
• Coolant drain plugs or knock sensor to 14 N-m
(124 lbs. in.).
EGR VALVE REMOVAL
Remove or Disconnect
1. Bolts or nuts.
2. EGR valve
3. Gasket
EXHAUST M ANIFOLD REMOVAL
Remove or Disconnect
1. Exhaust manifold bolts, washers, and tab washers.
2. Heat shields.
3. Exhaust manifold.
ROCKER ARM COVER REMOVAL
|<--»| Remove or Disconnect (Figure 11)
1. Rocker arm cover bolts (700).
2. Rocker arm covers (701).
3. Gaskets (702).
INTAKE M ANIFOLD REMOVAL
0
Remove or Disconnect
1. Intake manifold bolts.
2. Intake manifold.
3. Gaskets.
VALVE TRA IN COM PONENT
REMOVAL
Important