Valve Train Components; Hydraulic Lifters; Cylinder H E A - Chevrolet 1988 Light Duty Truck Repair Manual

1. S haft E xtension
2. Pump Body
3. Drive Gear and Shaft
4. Id ler Gear
5. Pum p Cover
6. Pressure R egulator Valve
7. Pressure R egulator S pring
8. R etaining Pin
9. Screw s
10. P ickup Screen and Pipe
Figure 17— Oil Pump Com ponents
• The pickup pipe is a press fit in the pump
body.
• Do not try to remove the screen from the pipe.
The pickup screen and pipe is serviced as an
assem bly only.
C lean
A ll p a rts in cle a n s o lv e n t and b lo w d ry w ith
com pressed air.
i ? In sp ect (F ig u re 17)
Pump body (2) and cover (5) for cracks or other
damage.
Gears (3 and 4) for wear.
Drive gear and shaft (3) for lack of fit in the pump
body (2).
Inside of the cover (5) for wear that would perm it oil
to leak past the ends of the gears. The pump gears,
cover, and body are not serviced separately. If the
parts are damaged or worn, replace the entire oil
pum p assembly.
Pickup screen and pipe (10) for dam age to the
screen, pipe or relief grommet.
Pressure relief valve (6) for fit. The regulator valve
should slide freely in its bore w ithout sticking or
binding.
0
Install or C o n n ect (F ig u re 17)
Tool Required:
J 21882, Pickup Tube and Screen Installer
1. Pressure regulator valve.
2. Spring.
3. Spring retaining pin.
4. Drive gear and shaft.
5. Idler gear.
• Index the marks made during disassembly.
6. Cover and screws.
T ig h te n
• Screws to 5.0 N m (84 in. lbs.).
Turn the drive shaft by hand to check for smooth
operation.
NOTICE: Be c a re fu l o f tw is tin g , s h e a rin g o r
c o lla p s in g the p ip e w h ile in s ta llin g the p u m p .
7. Pickup screen and pipe (if removed) (figure 18).
• If the pickup screen and pipe assem bly was
removed, it should be replaced with a new
part. Loss of press fit condition could result in
an air leak and loss of oil pressure.
• Mount the oil pum p in a soft jawed vise.
• Apply sealer to the end of the pipe.
• Tap the pickup screen and pipe into place,
using J 21882 and a hammer.
• The pum p screen must be parallel with the
bottom of the oil pan when installed.
8. Oil pump drive shaft and connector (1).

VALVE TRAIN COMPONENTS

B-09445
PUSHRODS, ROCKER ARMS, BALLS, AND NUTS
131
Clean
Parts in solvent. Blow dry with com pressed air.
Make sure the oil passages in the pushrods are
clear.
1?
Inspect
Rocker arms and balls at their m ating surfaces.
These surfaces should be smooth and free from
scoring or other damage.
Rocker arm areas which contact the valve stems
and the sockets which contact the pushrods. These
areas should be smooth and free of dam age and
wear.
Rocker arm nuts.
Pushrods for bending. Roll the pushrod on a flat
s u rfa ce to d e te rm in e if it is bent. R e pla ce if
necessary.
Pushrod ends for scoring or roughness.

HYDRAULIC LIFTERS

Refer to GENERAL ENGINE MECHANICAL (SEC. 6A).
R em o ve or D isco n n ec t (F ig u res 19 and 20)
Tool Required:
J 8062, Valve Spring C om pressor
1. Valve keepers (20).
• Com press the springs with J 8062 (figure 20).
• Remove the keepers.
• Remove J 8062.
2. Cap (21), shield (22), seal (24), and dam per (25),
and spring (26) (intake valve).
3. Rotator (28), shield (22), seal (24), and dam per (25),
and spring (26) (exhaust valve).
4. O-ring seals (23).
5. Valves (27 and 29).
• Place the valves in a rack so they can be
returned to their original position at assembly.
4.3 LITER V
-6
CYLINDER HEAD
6A3-13