Model Airways CURTISS JN-4D JENNY Instruction Manual page 26

you drilled on each side of the rear face of
the lower engine block.
Drill a hole into the carburetor filter for the
fuel line wire, and add the fitting and hole
for the throttle arm wire coming from the
cockpit. Next, glue the carburetor and filter
casting (E24) onto the pin at bottom of the
V intake manifold coming through the sup-
port casting.
Magneto, camshaft gearbox, and water
pump (Figure 5-6):
Glue the two halves of
the water pump (E30A & B) together. Drill a
hole on each side of the extension from the
water pump for the wire (tubing) that will
go between the pump and the V intake man-
ifold, but don't install the wire. This will be
done after engine installation in the model.
Glue the assembled pump into the hole in
the camshaft gear box. There is a pin on the
bottom of the pump for the piping to the
radiator, but this will be installed later when
the engine is in the aircraft.
Fit and glue the camshaft gear box (E36)
square guide pin into the slot in the upper
engine block. Glue the magneto (E37) pin
fitting in the hole at top of the camshaft
gearbox and to the top of the engine block.
If you intend to insert ignition wires
Note:
into the distributor block of the magneto,
drill these holes before installing the magne-
to. Refer to the paragraph on ignition wiring
below for other options.
Cylinder installation (Figure 5-7):
OX-5 engines, some have cylinders which
are secured in place with four steel rods
through spider ends, and some have no such
hold-downs. I elected the latter to simplify
the castings and assembly.
The cylinders (E25A) are to be installed
with the lower hole for the water inlet pipe
pointing outboard. But before installing the
cylinders, drill the hole in the top of each
cylinder and glue in the spark plugs
(E25B). Note that the spark plug for the
cylinders on the left side of the engine are
on the back side of the cylinder and the
right side has the plugs on the front side.
Locate the holes correctly according to the
plan so the plugs do not interfere with the
water outlet pipe.
The cylinders have an extension on the
bottom for inserting in the holes in the
upper engine block.
Before gluing the cylinders in
Caution:
the block holes, prefit the intake manifolds
(E42, exhaust manifolds (E43), and water
inlet pipes (E31) in the holes on the side of
the cylinders. You must also insure that the
rocker support casting on top of each cylin-
der is aligned so the rocker arms will be
perpendicular to the engine block. When
all these parts fit, mark the cylinders and
block for guidance, then glue the cylinders
in the holes. It may be necessary to file
the sides of the four pins of the manifolds
and inlet pipes to get all pins fitting into
the cylinder holes. As an option, when
everything is aligned, permanently glue
FIG. 5-5 V INTAKE MANIFOLD & CARBURETOR
PRECAST HOLES IN
BOTTOM OF BLOCK
DRILL HOLES
FOR WATER LINES
FIG. 5-6 MAGNETO, CAMSHAFT GEAR BOX & WATER PUMP
On real
FIG. 5-7 CYLINDER INSTALLATION
E42
TYPICAL
CYLINDER E25A
FRONT
SUPPORT E23
CARBURETOR E24
MAGNETO E37
PRECAST HOLE
DRILL HOLE FOR WATER LINES TO
V INTAKE MANIFOLD (BOTH SIDES)
SPARK PLUG E25B
PLUG ON RIGHT
CYLINDER IS ON
FRONT SIDE
E43
E31
THIS LOWER
PREFIT MANIFOLDS
HOLE FACES
AND INLET PIPE IN
OUTBOARD
ALL CYLINDERS
BEFORE GLUING
26
HOLES DRILLED IN
BACK OF BLOCK
V INTAKE MANIFOLD E39
(SEE DETAILS ON
PLAN, SHEET 5)
THROTTLE ROD
LINK
DRILL HOLE
DRILL HOLE FOR
FUEL TANK LINE
CAMSHAFT GEAR BOX
E36
WATER PUMP
HALF 30B
WATER PUMP
HALF 30A
FIG. 5-8 INTAKE MANIFOLD
INSTALLATION
INTAKE MANIFOLD
E42 (BOTH SIDES)
DRILL
HOLE
LONG
REAR
PIPE
SIDE
E41A
FIT INTO UPPER
(RIGHT
HOLE IN EACH
SIDE)
CYLINDER
SHORT
PIPE
E41B
(LEFT
SIDE)
V INTAKE
MANIFOLD
E40
(BOTH
SIDES)