BYPASS
VALVE
REAR BEARING
B>
PLATE
--L
OIL
BYPASS
I
OIL
BYPASS
FIGURE
39.
BYPASS
VALVE
NOTE
I
-USE
A
ff70
DRILL
(.OB)
(.71
d
FOR CLEANING AREA
1.
NOTE
2
-
USE A
#56
DRILL
(-046)
(1
-
17
ttd
FOR CLEANING AREA
2.
W
FLUSH
ROCKER
BOX OIL
LINE
WITH
FUEL AND CLEAN HOLES
WITH
FINE
WIRE.
Located on the outside of the rear bearing plate, the
bypass valve (Figure
39)
controls oil pressure by
allowing excess oil to flow directly back to the
crankcase. Normally thevalve begins to open at about
25
psi
(172.5
kPa).
It
is non-adjustable, and normally
needs no maintenance.
To
determine
if
high
oil
pressure
is
caused by the
plunger sticking closed, or low oil pressure by the
plunger sticking open, clean and inspect the valve.
To
remove the valve, unscrew the recessed plug
in
the
rear bearing plate and lift out the spring and plunger
assembly. Determine proper valve operation by
checking the spring and plunger against the given
values:
Plunger Diameter..
. .
. . 0.3365
inch to
0.3380
inch
Spring
(8.5471
to
8.5852
mm)
Free Length..
..
. .
..
.
2-5/16
inches,
+ 1/16
inch
(74.613,
+
1.588
mrn)
2.225
Ib.
at
1-3/16
inches (compressed)
at
(30.163
mm)
(compressed)
(1.01
kg)
ALL Z-CYLINDER
DIESEL MODELS
FIGURE
40.
CLEANING ROCKER
BOX
OIL LINE AND RESTRICTION ORIFICES
31
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