GORMAN-RUPP 62-1/2E13-4A084, Technical Manual, Page: 53 / 107

Section V. EXHAUST SYSTEM
3-15. DESCRIPTION
a. General. The exhaust system consists of a muffler
which connects to the manifold piping of the engine,
and an exhaust primer which mounts on top of the
muffler.
b . Muffler. The muffler helps reduce engine exhaust
noise. It consists of a sheetmetal cylinder which
contains baffles around which exhaust gases must
circulate before they are dispelled to atmosphere.
This system tends to equalize the pressures at which
the exhaust is released, resulting in a noise reduction.
c . Exhaust Primer. When the exhaust primer is not
operating, exhaust gases from the muffler are directed
through the exhaust port at the top of the priming
valve body with little restriction. To operate the
primer, the exhaust primer lever is positioned so
that a cap seals the exhaust port at the top of the
valve body. This forces the exhaust gases through a
venturi system at the side of the valve body. As the
gases pass through the venturi, their speed is highly
accelerated. Suction is created as the gases rush past
a port just beyond the restricted area of the venturi.
A vacuum line connects this port and a port at the
top of the pump housing. When the exhaust primer
Figure 3-8. Muffler and exhaust primer,
removal and installation.
control valve in the exhaust line is open, the suction
created by the venturi action sucks water into the
pump body, and when it is filled, into the suction line.
The water which is sucked through the suction line
is discharged through the primer. This indicates that
the pump body is full and that additional priming is
not required. The exhaust primer control valve is
then closed and the exhaust primer lever operated to
remove the cap from the top of the exhaust primer
and to allow the exhaust gases to be discharged
through the exhaust port at the top of the body without
restriction. The exhaust primer control valve should
remain closed until the next time priming is required.
3-16. MUFFLER AND EXHAUST PRIMER
a. Removal and Disassembly.
—
(1)
(2)
Refer to figure 3-8 and remove the muffler and
exhaust primer.
Refer to figure 3-9 and disassemble the muffler
and exhaust primer as necessary to replace de-
fective parts.
Figure 3-9. Muffler and exhaust primer,
disassembly and reassembly.
3-9