Evolution Engines 52NX - Manual (Page 8)

 
How to Tell if your Glow Plug is Bad
The glow plugs on the market today are designed
to provide good service to the user and may last a
long time or a short time, all dependent upon the
way you choose to operate your engine.
Physical indications that you might need to
change the glow plug are:
1.
Twisted or mangled glow plug element
(usually caused by too high a compression ratio).
2. Small “bumps” are attached to the glow plug
element. This will generally be most noticeable
during the break-in process. These are
actually tiny pieces of aluminum that have
attached to the element and these will
severely hinder the operation of the glow plug.
3. The glow plug element is no longer shiny but
is dull, almost a white powder color. (This just
comes with age and is a by-product of the
catalytic reaction. The shinier the wire,
the better the catalytic reaction can be).
Operating indications that you need to change
your glow plug are:
1. The glow element will not light with a charged
glow igniter. This indicates that there is a
physical short or breakage in the element
wire itself.
2. Glow plug lights but the engine will not
continue running once the battery is dis-
connected. (This is usually an indication of the
microscopic particles we discussed earlier).
3. Glow plug lights, engine runs but there is a
perceptible loss of rpm at full throttle when
the battery is disconnected. This is a typical
indication that the white powder residue is
building to the point that the catalytic
reaction of the glow plug is no longer
anywhere close to being optimum.
Disp Bore Stroke Weight Crank K
Items (c.I.) (mm) (mm) (oz) (ISO) Cylinder Propeller
EVOE0520H .520” .882” .847” 15.36 1/4X28 ABC RING N/A
NX Evolution Helicopter Engine Specifications
Dimensions(mm) A B C D E F G H
EVOE0520H 36 44 17.5 52.5 93.25 105 1/4 X 28 37
F
H
G A
D C
E = height
F = length
G = crankshaft thread size
H = muffler bolt spacing
B