Chevrolet 1980 Light Duty Truck Service Manual page 438

6A 1-20 IN-LINE 6
1.
Pressure Re gulato r
V a lv e
2.
Pressure R e gulato r
S pring
3.
Re tain ing Pin
4.
S c re w s
5.
Pu m p Cover
Fig. 6A1-2 6--O H Pump
6. Inspect the pickup screen and pipe assembly for
damage to screen, pipe or relief grommet.
7. Check the pressure regulator valve for fit.
The pump gears and body are not serviced separately.
If the pump gears or body are damaged or worn,
replacement of the entire oil pump assembly is necessary.
Assembly
1. 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. Mount the pump in a soft-jawed vice, apply sealer
to the end of pipe and tap the pipe in place with a plastic
hammer using Tool J-8369.
Be careful of twisting, shearing or collapsing
NOTICE:
pipe while installing in pump. Pickup screen must be
parallel to bottom of oil pan when oil pump is installed.
2. Install the pressure regulator valve and related
parts.
6.
Cover G a s ke t
7. Idler G e a r
8. Drive G e a r and Shaft
9.
Pu m p Body
10
. Pickup Screen and
Pipe
Fig. 6 A 1-27~Gagin g Plastic on Crankpin
3. Install the drive gear and shaft in the pump body.
4. Install the idler gear in the pump body with the
smooth side of gear towards pump cover opening.
5. Install the pump cover, with new gasket, and torque
attaching screws to 70 lb. in. (8N*m ).
6. Turn drive shaft by hand to check for smooth
operation.
CO NNECTING ROD BEARINGS
Connecting rod bearings are of the precision insert type
and do not utilize shims for adjustment. DO NOT FILE
RODS OR ROD CAPS. If clearances are found to be
excessive a new bearing will be required. Service bearings
are available in standard size and .001" and .002" undersize
for use with new and used standard size crankshafts, and
in .010" and .020" undersize for use with reconditioned
crankshafts.
On removing a connecting rod cap, it is possible to find
a .009" undersize bearing. These are used in manufacturing
for selective fitting.
Inspection and Replacement
1. With oil pan and oil pump removed, remove the
connecting rod cap and bearing.
Before removal of connecting rod cap, mark the side
of the rod and cap with the cylinder number to assure
matched reassembly of rod and cap.
2. Inspect the bearings for evidence of wear or damage.
(Bearings showing the above should not be installed.)
3. Wipe both upper and lower bearing shells and
crankpin clean of oil.
4. Measure the crankpin for out-of-round or taper
with a micrometer. If not within specifications replace or
recondition the crankshaft. If within specifications and a
new bearing is to be installed, measure the maximum
diameter of the crankpin to determine new bearing size
required.
LIG H T T R U C K S E R V IC E M AN UAL