GMC 4000 Series Service Manual page 312

1 Suction Tube and
Screen A ssy.
2 Bracket Bolt
(20-25 ft.-lb s .)
3 Flange Bolts and Lock
W ashers
4 G askets
Figure 15— Engine Oil Pum p and Suction Screen Assem bly
INSPECTION AND REPLACEMENT
OF SUCTION SCREEN AND TUBE
Inspect screen and tube for damage. If screen
is clogged, the assembly should be removed from
pump and thoroughly cleaned; or a new suction tube
and screen assembly installed.
When installing tube and screen assembly on
oil pump, use new gasket between tube flange and
pump body. Install all attaching bolts loosely, then
tighten bracket bolt (2, fig. 15) first. Correct
torque is 20 to 25 foot-pounds. Finally, tighten
tube flange bolts (3, fig. 15).
INSTALLATION (Fig. 15)
1. Place new pump-to-block gasket on oil
pump flange, and insert pump drive shaft in drive
socket in pump shaft.
2. Set oil pump assem bly in position at cylin­
der block and turn pump as necessary to engage
the pump drive shaft with drive socket at upper
end.
3. Align mounting bolt holes in pump flange
with holes in block and install pump to block bolts
(7, fig. 15).
4. Install engine oil pan as previously instruc­
ted under "Engine Oil Pan Replacement" in this
section.
CRANKSHAFT REAR
BEARING OIL SEAL
The lip-type seal used at crankshaft rear
bearing can be replaced without removing crank­
shaft or bearings.
G M C S E R V I C E M A N U A L
5 C ylinder Block
6 Pump D rive Shaft
7 Pump to Block Bolts
(30-35 ft.-lb s.)
8 Oil Pump
9 Bracket
10 Oil Pan r-246o-2
TORO-FLOW DIESEL ENGINE
SIDE SEA L G R O O V E
Figure 16— Rem oving Seal Lower Half from Bearing Cap
SEAL REMOVAL
1. With oil pan and oil pump removed from
engine, remove the rear main bearing cap.
2. Remove lower half of seal from bearing
cap using screwdriver as shown in figure 16.
3. Use a drift of soft metal (aluminum, copper
or brass) to start the seal upper half out of cylin­
der block (fig. 17).
SEAL INSTALLATION
1. Wipe crankshaft with clean cloth. Apply en­
gine oil on seal lip, then position oil seal upper half
on crankshaft with seal lip toward front of engine.
2. While pressing on seal with hammer handle
or suitable blunt tool, turn crankshaft and seal to­
gether until seal is rolled into position in block in
same manner as for installing bearing insert. Both
DRIFT
Figure 17— R e m o vin g Seal Upper H alf from Block
Sec. 6B
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