Gillette Generators SPMD-2500 THRU SPMD-4000 - Manual (Page 16)

PAGE 16
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
result from:
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
COLUMN.
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
reduce
exhaust emissions and improve fuel
economy.
MUFFLER MOUNTING TO GENERATOR
GENERATOR MODEL
JOHN
DEERE
DRIVEN
FIAT
DRIVE
PIPE
SIZE
COWL
MODEL
MUFFLER
DESCRIPTION
NET
WEIGHT
LBS.
SPJD-250
SPJD-300
2”
CR-2” RESIDENTIAL GRADE 15
CC-2” CRITICAL GRADE 19
SPJD-420
SPJD-520
SPJD-600
2 ½”
CR-2 ½” RESIDENTIAL GRADE 20
CC-2 ½” CRITICAL GRADE 32
SPJD-800
SPJD-1000
3”
CR-3” RESIDENTIAL GRADE 32
CC-3” CRITICAL GRADE 52
SPJD-1250
SPJD-1550
SPJD-1800
SPJD-2100
3½”
CR-3½” RESIDENTIAL GRADE 38
CC-3½” CRITICAL GRADE 63
SPMD-2500
SPMD-2800
SPMD-3000
5”
CR-5” RESIDENTIAL GRADE 74
CC-5” CRITICAL GRADE 98
SPMD-3500
SPMD-4000
6”
CR-6” RESIDENTIAL GRADE 94
CC-6” CRITICAL GRADE 137
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
water.
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
GENERATOR ROOM
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,
page 14.
The most common method of generator set cooling,
is that of a generator mounted radiator. The major
components are:
RADIATOR COOLANT CAPACITY
(INCLUDING ENGINE BLOCK)
GENERATOR MODEL
JOHN DEERE DRIVEN FIAT DRIVE QUARTS LITERS
SPJD-250
SPJD-300
9.16 8.6
SPJD-420
SPJD-520
SPJD-600
13.0 12.2
SPJD-800
SPJD-1000
SPJD-1250
SPJD-1550
SPJD-1800
SPJD-2100
37.0 35.0
SPMD-2500
SPMD-2800
SPMD-3000
67.0 63.4
SPMD-3500
SPMD-4000
71.7 67.9