Onan DJA Series User Manual

Plunger diameter 0.3365-inch to 0.3380-inch
Spring -
free length 2-5/16 11/16-inch
2.225 lb. 0.11 lb. at 1-3/16-inch (compressed)
OIL LINES
The rocker box oil line should be flushed with fuel and
small holes cleaned with fine wire at regular intervals.
Clean out all other oil lines and drillings with com-
pressed air whenever the engine is disassembled or
overhauled. Reach the oil gauge passage by removing
the oil filter mounting plate.
External oil lines, the rocker box oil line and the inter-
nal oil line to the rear bearing are replaceable if
damaged.
GAUGE
The oil pressure gauge is located on the lower front
corner of the cylinder block. Remove it with a wrench
and screw in a new gauge if it is faulty. Before replac-
ing, check for clogged oil passage behind the gauge.
OIL PRESSURE SWITCH
The nonadjustable oil pressure switch controls the
decompression solenoid in the starting system, allow-
ing it to energize only when the switch closes. This
allows the engine to build up speed, during starting,
before compression occurs. The switch closes at
about five psi under increasing oil pressure.
NOTE: This switch is not designed to be used as low
oil pressure protection. It won't protect the engine
against slowly decreasing oil pressure.
To check switch operation, if the decompression sole-
noid won't energize, short it to ground when the engine
has built up speed during starting. The governor sole-
noid should energize immediately and the engine start.
CAUTION
When the engine starts, check immedi-
ately lor oil pressure and shut the
engine down il oil pressure doesn't build up within a
few seconds. In this case it is lack of oil pressure
that is causing faulty operation, not the switch.
REAR BEARING
PLATE
OIL BVPASS
SPRING
FLUSH ROCKER BOX OIL LINE WITH
SUITABLE SOLVENT AND CLEAN
HOLES WITH FINE WIRE.
FIGURE 27. OIL BYPASS VALVE
FIGURE 28. CLEANING ROCKER BOX OIL LINE
27

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English