5. Remove the pump driven gear (22)
from the driven gear shaft (24).
6. Straighten the lip of the lock washer
(84) and unscrew the bolt (83) thus free-
ing the idler gear (56).
7. Clamp the pump body, drive shaft and
gear assembly in a bench vise. Pull the
drive driven gear from the outer end of
the
pump
drive
shaft
as
shown
in
F i g u r e 11E-6. Removing Oil Pump
Drive Gear from Shaft
shaft must be reamed to 0.500" 0.0005"
and bushings used with the 0.623" diam-
eter shaft must be reamed to 0.625"
0.0005".
Inspect the bushings in the pump body
and cover. If the bushings are worn ex-
replace the pump and cover
cessively,
suitable boring equipment is
unless
available for finishing the new bushings.
F i g u r e 11E-5. Removing Oil Pump
When installing new bushings, replace all
Drive-Driven Gear from Shaft
of the bushings. The bushings must be
located and positioned as shown in
8. Remove the Woodruff key (14) from
Figure 11E-7 on page 11E-7. Also, the
the drive shaft and withdraw the shaft
gear bore and the bushing bore in both
and driven gear (22) from the pump
the pump body and cover or scavenging
body.
pump body must be concentric within
0.001".
The
shaft-to-pump
9. Unscrew bolt (86) and remove idler
body-bushing
clearance
with
new
parts
gear support (82) from the pump body.
is
0.0008"
to
0.0025".
The
shaft-to-pump cover bushing clearance
10. If the drive gear (23) is to be re-
with new parts is 0.0010" to 0.0027".
placed, p o s i t i o n t h e g e a r a n d s h a f t a s -
sembly on bed of an arbor press with
In
an
efficient
oil
pump,
the
gears
extending down
shaft
long
end
of
should have a free-running fit (with no
through slot in bed plate and with the
perceptible looseness) in the pump hous-
face of the gear resting on the plate as
ing.
Place a short
w o r n , install new gears. The use of ex-
1/2" round steel rod on the end of the
cessively worn gears will result in low
and press the shaft from the
shaft,
engine oil pressure with in turn, may
gear.
lead to serious damage through out the
engine.
I n s p e c t Oil Pump Parts
Wash all parts in clean fuel oil and dry
seat in the pump body.
If necessary,
t h e m with compressed air.
install new parts.
Examine the gear cavity in the pump
body and the drive shaft bushings. If
Assemble Oil Pump
the driven gear bushings are worn, re-
place the bushings. Service replacement
and
bushings i n t h e d r i v e n g e a r s m u s t b e
a s s e m b l e the oil pump as follows:
Bushings used
reamed after assembly.
with the 0.499" diameter driven gear