(4) Install the mounting washers (6), bridge clamps (12) and nuts (7). Tighten the nuts (7) securely. The proper
torque wrench reading is 25 to 30 ft-lb.
(5) Connect the exhaust pipe with the exhaust manifold (1).
(6) Install the carburetor (par. 106c).
133. Exhaust Pipe and Muffler (fig. 47)
a. Description. The exhaust pipe directs the flow of the exhaust gases from the exhaust manifold into the muffler. In
the muffler, these gases are split into thin streams and expanded; this action silences the noise without creating back
pressure. The muffler is mounted on the floor of the road roller and is supported by two brackets (16 and 19). The
exhaust pipe is constructed of threaded pipe nipples (1, 3, and 4) and pipe elbows (2).
b. Removal.
(1) Unscrew the pipe nipple (1) from the exhaust manifold and disconnect the exhaust pipe from the exhaust
manifold.
(2) Remove the mounting bolts (11), lockwashers (15), and nuts (14) attaching the muffler to the brackets (16
and 19).
(3) Remove the exhaust pipe and muffler assembly.
c. Disassembly.
(1) Unscrew and disconnect the pipe elbows (2) and connecting pipe (3).
(3) Remove the muffler bolts (20) and nuts (21) and lift up the muffler top cover (8).
(4) Remove the top (9) and bottom (10) deflectors.
(5) Remove the bracket mounting bolts (13), lockwashers (18), and nuts (17). Remove the mounting brackets
(16 and 19) from the floor of the road roller.
d. Inspection. Inspect all muffler parts for corrosion, cracks, or breaks. Inspect the mounting brackets and bolts for
wear, damage, and corrosion. Inspect the pipe threads and see that they are not stripped or damaged. Inspect the
packing and replace if burned, worn, or damaged.
e. Cleaning. Wash all metal parts in cleaning solvent. Clean the rust and scale from the muffler with a stiff wire
brush. Clean all pipe and bolt threads. Replace bolts and nuts if the threads are corroded or stripped.
f. Reassembly.
(1) Install the mounting brackets (16 and 19) on the road roller floor and tighten the mounting bolts (13),
lockwashers (18), and nuts (17).
131