Model Airways CURTISS JN-4D JENNY Instruction Manual Download Page 29

Page: 29 / 40

FIG. 5-16 OIL & WATER LINES TO COCKPIT GAUGES

OIL PRESSURE GAUGE

WATER

TEMPERATURE

GAUGE

ENGINE BEARERS

OIL PUMP AT BOTTOM

OF ENGINE

.025"-DIA. COPPER WIRE

attach to the upper fuselage strut fittings at
Station 2 and are secured at the clips molded
into the sides of the radiator. Cut a rabbet in
the end of the strut to accept the clip on the
radiator as shown in the figure and on the plan.

4. Installing Engine Piping,

Tubing, and Control Linkages

The plans show most of the basic items and
they are described below. What’s missing are
some details such as small switches, wiring
to switches, magneto, and tachometer cable.
To be honest, no plans or details were found
describing these specific items, but they are
really considered insignificant for the model.

Tubing for the oil pressure gauges and

tubing for the water temperature gauge

(Figure 5-16):

For the oil pressure gauge

tubing, use 0.025"-diameter copper wire to
represent the tubing. The wire is located on
the right side of the fuselage and runs from
the oil pump under the engine to the rear
cockpit oil pressure gauge, with a feed off
to the front cockpit gauge. The wire can be
secured in place with some small brass sta-
ples, or just glue at several spots.
For this and other tubing, notice the coils
at some ends that provide for expansion of
the tubing.
For the water temperature gauge tubing, use
0.015"-diameter copper wire to represent the
tubing. The wire is located on the left side of
the fuselage and runs from the pin at the top
of the radiator to the water temperature
gauge in the rear cockpit.

Flex tubing from the radiator to the

engine water outlet pipes (Figure 5-17):

Use flexible PVC tubing between the radiator
water inlet pins and the water outlet pipes on
the engine. There is one on each side. Paint
the clear tubing black.

Outlet water piping from the radiator to

water pump (Figure 5-18):

The lower water

pipe (E34) runs on the left side of the engine
from the bottom of the radiator to the engine
water pump. Hang the pipe with a brass strap
from the left engine bearer. Connect the end
of the pipe to the radiator with a short sec-
tion of PVC tubing.

Flex air heater tubing from the exhaust

manifolds, and water tubing from the

V intake manifold to the water pump

(Figure 5-19):

Use clear PVC tubing from

the two angled openings at the base of the
carburetor up to the pins on the underside
of both exhaust manifolds. Since these tubes
are actually metal flex tubes, paint the tubing
silver. These tubes provide heat from the
exhaust to the carburetor.
The V intake manifold is a water-jacketed
unit. Rubber tubes on each side provide
water to the manifold from the water
pump. These could not be installed initially
on the engine because they must go around
the transverse engine-bearer support beam,
as does the lower inlet water pipe. These
can be installed using copper wire. Fit the
wire between the holes you drilled on the

WATER OUTLET AT TOP OF RADIATOR

.015"-DIA. COPPER WIRE

STAPLE, TAPE, OR GLUE COPPER WIRES

TO OUTSIDE OF ENGINE BEARERS

AND UNDER OR ALONGSIDE OF

LONGITUDINALS AS NECESSARY

TO HOLD WIRES IN PLACE

FIG. 5-17 WATER OUTLET

TUBING TO RADIATOR

WIRE PIPE

CASTING E34

LEFT ENGINE