GMC 4000 Series Service Manual page 313

Sec. 6B
Page 302
TORO-FLOW DIESEL ENGINE
1 Clamp Bolt and Washer
2 Clamp
3 Cap (Used when Tachom eter
4 Oil Pump D rive Gear Shaft
5 Gasket
6 D rive Gear and Shaft A ssy.
7 Oil Pump D rive Shaft
/
8 Cylinder Block
9 Bushing-
BO - rLu a n
oi m ino
TO 0 .0 1 0 "
iE LO W TH IS SURFACE
Figure 18— Tachometer and Oil Pum p Drive Parts
ends of seal should be flush with block surface.
3. Using fingers, p ress seal lower half into
place in bearing cap with seal lip forward to mate
with lip on seal upper half.
4. Apply sealer at block, then bolt bearing
cap in place. Dip new bearing cap side seals in
diesel fuel and insert in bearing cap grooves.
5. Install oil pump and oil pan using new pan
gasket. Refer to appropriate instructions given
previously to install oil pump and oil pan.
TACHOMETER A N D OIL PUMP
DRIVE REPLACEMENT
GENERAL
Tachometer (when used) and engine oil pump
Recommended specifications for proper torque to apply at points
throughout the engine are as given below. Figures shown are foot-pounds
of torque with threads clean and dry except as otherwise indicated.
Item
Cylinder Head Bolts ...............................
Flywheel to Crankshaft Bolts
Intake Manifold End Bolts
Exhaust Manifold End Bolts
Manifold Clamp Bolts ............................
Rocker Arm Shaft Bracket Bolts . . . .
G M C S E R V I C E M A N U A L
is Omitted)
Housing
TORQUE WRENCH SPECIFICATIONS
Ft.-Lbs.
130-135*
.............. 100-110
.................... 20-25
................. 15-20
20-25
20-25
are driven from gear teeth machined on camshaft.
The shaft, gear, and housing assembly (fig. 18)
are installed in cylinder block at location normally
occupied by ignition distributor on gasoline engine.
Oil pump is driven by shaft which engages socket
in lower end of drive gear. When tachometer is
used, the tachometer drive engages slot in upper
end of gear and shaft assembly (6, fig. 18).
Key numbers in text refer to figure 18.
REMOVAL
1. Disconnect tachometer drive shaft, or if
tachometer is not used, remove cap (3) from drive
housing.
2. Remove clamp bolt, washer, and clamp (2)
which secure shaft housing to cylinder block.
3. Lift the shaft and housing out of cylinder
block, then use long nose pliers to reach into cyl­
inder block cavity and remove oil pump drive shaft
from oil pump.
4. Remove housing gasket (5).
INSTALLATION
1. Lubricate gear and shaft assembly with
engine oil, then insert shaft into housing (4).
2. If oil pump drive shaft was removed from
engine, insert shaft (7) into socket in oil pump.
3. Place new gasket (5) at housing flange, then
install shaft and housing assembly in block. If the
housing flange cannot be pushed down into contact
with block, it may be necessary to turn crankshaft
sufficiently to rotate drive gear so socket will
engage pump drive shaft (7).
4. Push shaft housing down firmly so the
flange seats on gasket, then install clamp (2)
and secure bolt and lock washer (1).
5. Install cap (3) and gasket, or connect tach­
ometer drive.
Item
Damper to Crankshaft Bolt ......................
Oil Filter Center Stud ...............................
Oil Pan Drain Plug .....................................
Oil Pa.n to Cylinder Block B o l t s ..............
Oil Pump to Cylinder Block Bolts
*Oiled with S.A.E. No. 10 Engine Oil.
Ft.-L bs.
240-260
40-50
25-35
10-15
. . . . 30-35