Valve Train Components; Pushrods, Rocker Arms, Balls, And Nuts - GMC T Series 1994 Repair Manual

6. Retaining pin (8).
7. Pressure regulator spring (7)
8. Pressure regulator valve (6).
JJJ* Clean
• All parts in clean solvent and dry them with com­
pressed air.
Inspect (Figure 28)
• Pump body (2) for cracks, wear, or other damage.
• Inside of the cover (5) for cracks and wear that
would permit oil to leak past the ends of the gears.
• Gears (3 and 4) for wear.
• Drive gear and shaft (3) for lack of fit in the pump
body (2).
• The pump gears, cover, and body are not serviced
separately. If any of the parts are damaged or
worn, the entire oil pump assem bly must be
replaced.
• Pickup screen and pipe (10) for damage to the
screen or loose fit of the pipe.
• Pressure regulator valve (6) for fit. The regulator
valve should slide freely in its bore without sticking
or binding.
Install or Connect (Figures 28 and 29)
Tool Required:
J 21882 Pickup Tube and Screen Installer
1. Pressure regulator valve (6) into the pump cover.
2. Pressure regulator spring (7) into the pump cover.
3. Retaining pin (8) into the pump cover.
4. Drive gear and shaft (3) into the pump body.
5. Idler gear (4) into the pump body.
• Match together the index marks on the two
gears made during disassembly.
6. Pump cover (5).
NOTICE: Refer to "Notice" on page 6A3-1.
7. Screws (9).
Tighten
• Screws (9) to 5.0 N-m (84 lbs. in.
• With the shaft extension (1) installed on the pump,
turn the drive shaft by hand to check for smooth
operation.
NOTICE: Be careful of twisting, shearing, or
collapsing the pipe when installing it to the
pump. A damaged pipe can cause lack of
lubrication and engine failure.
8. Pickup screen and pipe.
A. If the pickup screen and pipe assembly 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.
B. Mount the oil pump in a soft-jawed vise.
C. Apply sealer to the end of the pipe.
D. Tap the pickup screen and pipe into place,
using J 21882 and a hammer.
E. The pump screen must be parallel with the bot­
tom of the oil pan when installed.
9. Oil pump drive shaft and connector (1).

VALVE TRAIN COMPONENTS

Important
• Store all reusable components in an exact order,
so they may be reassembled in the same position
from which they were removed.

PUSHRODS, ROCKER ARMS, BALLS, AND NUTS

j y l Clean
All parts in clean solvent and dry them with com­
pressed air.
Make sure the oil passages through the pushrods
are clear.
L*
Inspect
Rocker arms and balls at their mating surfaces.
These surfaces should be free from wear or dam­
age.
F9471