Cooling the generator, Muffler mounting to generator, Radiator coolant capacity – Gillette Generators SPMD-2500 THRU SPMD-4000 User Manual
Page 16: Including engine block)
F) The exhaust piping system is subject to engine
vibration, so it must be solidly installed to reduce
potential for pipe cracks or breakage.
G) It is very important to discharge exhaust gasses
away from the engine and out of the generator
building. If these gasses remain in the engine
cylinders, poor engine performance and eventual
engine damage may result. This condition usually
results from excessive back-pressure, which can
1) Exhaust pipe diameter is too small or exhaust
system is too long.
2) Excessive amount of bends in exhaust pipe run.
3) Obstructions (old birds nest, bees, insects, etc.)
in the exhaust system.
All three items are examples that will cause back
pressure that MUST NOT EXCEED 20”/WATER
Mufflers are shipped loose on all “Open” (no
enclosure) generator sets. Mufflers with weight up to
52 pounds can be attached directly to the engine
exhaust manifold pipe (See drawing on page 15).
Mufflers more than 52 pounds are too heavy for
mounting directly to manifold pipe. These heavier
muffler will require separate support structure. The
flexible exhaust pipe can be mounted to the engine
manifold pipe with additional piping to the ceiling
(roof) structure, where muffler can be suspended.
COOLING THE GENERATOR
This manual explains the use of engine mounted
radiators, as the only cooling method used for
GILLETTE generators. Environmental issues require
cleaner burning engine. Engine manufacturers have
raised engine operating temperatures in order to
MUFFLER MOUNTING TO GENERATOR
Today’s engines run on the borderline of over.
heating, with in-cylinder temperatures close to 2000º.
GILLETTE uses a 50/50 mix of glycol/di-ionized
water. When we know generator destination is in
colder climates such as Northern USA, Canada, or
Alaska, a 60/40 mix is used. When replacing coolant
in radiator DO NOT USE a 50% glycol and 50% tap
water. Tap water contains minerals, dissolved
oxygen, and chorine, which will cause scaling and
corrosion in the engine. Always use a mixture of
glycol and de-ionized water or distilled water, never
use tap water. Radiators of today’s design are
extremely fragile and light weight, containing
smaller cooling tubes and ,more cooling fins, so it
has become easier to clog radiators with corrosive
coolants. GILLETTE, the radiator manufacturer, and
engine block manufacture will decline warranty on
clogged radiator and engine block problems when it
is known that tap water is used rather than distilled
When coolant system is drained and fresh coolant is
added, it’s best to use a hydrometer for testing the
value of antifreeze mixture. A correct 50/50 mix
allows freeze protection to –34º F and boil-over
protection to 265º F.
COOLING THE GENERATOR AND
ENGINE THAT IS MOUNTED IN A
Whenever an open (no housing) generator set is
installed inside a room, in a building the radiator
should be ducted outside the room. See Figure 5,
The most common method of generator set cooling,
is that of a generator mounted radiator. The major
RADIATOR COOLANT CAPACITY
(INCLUDING ENGINE BLOCK)
JOHN DEERE DRIVEN