GMC 1989 Light Duty Truck, Руководство по ремонту, Страница: 399 / 998

2.8 LITER V-6 6A2-7
Figure 5— Air Injection Tube
CLEANING
Remove the engine accessories before cleaning, to
provide better access to engine exterior surfaces. After
removing the TBI unit, distributor, etc., cover the openings
with tape to prevent the entry of water, solvent, and dirt.
Methods used to clean the engine will depend on the
aids w hich are available. Steam cleaning, pressure
w ashing, or so lve nt c le a n in g are som e a ccep tab le
methods. Allow the engine to dry before beginning the
work.
It is important that the engine be as clean as possible to
p re v e n t d ir t fro m e n te rin g c r it ic a l a re a s d u rin g
disassembly.
DRAINING THE ENGINE
R em ove or D isconnect
1. Oil pan plug and allow the oil pan to drain.
2. Oil filter.
3. Block drains and allow the coolant to drain.
0
Install or Connect
1. Oil pan drain plug and washer.
2. Block drain plugs.
T ighten
Block drain plug to 12 N-m (9 ft. lbs.)
AIR INJECTION TUBE REMOVAL
R em ove or D isconnect (Figure 5)
1. Nut (75).
2. Air injection tube from the manifold.
Figure 6— EGR Valve
EGR VALVE REMOVAL
R em ove or D isco n n ect (Figure 6)
1. Bolts (80).
2. EGR valve (81).
3. Gasket (82).
EXHAUST MANIFOLD REMOVAL
R em ove or D isco n n ect (Figure 7)
1. Oil dipstick tube.
2. Bolts or studs.
3. Exhaust manifold.
ROCKER ARM COVER
REMOVAL
R em ove or D isco n n ect (Figure 8)
1. Rocker arm cover nuts (1) and reinforcements (2).
2. Rocker arm cover and gasket.
• If the cover sticks to the head, bump the end
of the cover. If the cover still does not come
loose, c a re fu lly pry until loose. DO NOT
DISTORT THE SEALING FLANGE.
INTAKE MANIFOLD REMOVAL
|+~+| R em ove or Disconnect
1. Intake manifold bolts and nuts.
2. Intake manifold.
• Pull the intake manifold up.
• Do not attempt to loosen the m anifold by
prying under the gasket surface with any tool.
3. Gaskets.