Draining The Engine; Air Manifold And Injection Tube Removal; Manifold Removal - Chevrolet 1988 Light Duty Truck Repair Manual

6A4-8 4.8 LITER L6

DRAINING THE ENGINE

□ R em o ve or D is c o n n e c t (F ig u re 5)
— Oil pan drain plug (144). Allow the oil to drain.
— Oil filter (174).
— Block drain plug (131). Allow the coolant to drain.
Install or C o n n e c t (F ig u re 5)
— Oil pan drain plug (144) and washer (143).
T ig h ten
• Oil pan drain plug (144) to 24 N m (18 ft. lbs.).
— Block drain plug (31).
&
T ig h ten
• Block drain plug (131) to 12.7 N m (112 in. lbs.).
AIR MANIFOLD AND
INJECTION TUBE REMOVAL
R em o ve or D isc o n n e c t (F ig u re s 7 and 8)
1. Air manifold (182).
• Unscrew the fittings.
• Remove the air manifold.
2. Air injection tubes (183).
• The air injection tubes are a push fit.
• If the air injection tubes will not come out, they
may be easier to remove after the manifolds
(31 and 37) are removed, as described later.

MANIFOLD REMOVAL

The intake and exhaust manifolds are removed as an
assembly. Instructions for separating and replacing the
m anifolds are outlined later in this section.
R em o ve or D is c o n n e c t (F ig u res 4, 9, and 10)
1. Heat stove (191) if used (figure 9).
• Remove the bolt (190).