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Section 04
ENGINE (DI)
Subsection 07
(EXHAUST SYSTEM)
04-07-6
SMR2002-065_04_07A.FM
Disconnect hoses of the water flow regulator
valve.
TYPICAL
1. Water supply hose
2. To injection fitting on tuned pipe
Disconnect retaining strap
no. 2
of muffler.
Pull muffler
no. 11
out of bilge.
TUNED PIPE REPAIR
This procedure is given to repair tuned pipe cracks
using T.I.G. welding process.
Procedure
– Sand the cracked area to obtain bare metal.
– Perform a 1.50 mm (1/16 in) depth chamfer over
crack.
– Use pure argon gas with 5.55 mm (3/32 in) tung-
sten electrode (puretung “green”, zirtung
“brown”) and AC current.
– Use a 5.55 mm (3/32 in) aluminum welding rod
(no. 4043), to fill crack.
– Sand welding slightly to remove material sur-
plus.
Test
– Use compressed air at 124 kPa (18 PSI) to pres-
surize tuned pipe.
CAUTION:
Always ensure water passages are not
blocked partially or completely while welding
tuned pipe.
NOTE:
Prior to verify leaks, plug all holes and pres-
surize tuned pipe while immerging it in water.
INSTALLATION
Installation is essentially the reverse of removal
procedures. However, pay particular attention to
the following.
Exhaust Manifold
Make sure gasket(s)
no. 17
are properly posi-
tioned prior to finalizing manifold installation.
Apply Molykote 111 on threads of Allen screws
no. 12
.
Install and hand tighten Allen screws
no. 12
as per
following picture.
1. M10 x 60 Allen screws
2. M10 x 110 Allen screws
Torque Allen screws to 24 N•m (17 lbf•ft) as per fol-
lowing illustrated sequence. Repeat the procedure,
retightening Allen screws to 40 N•m (30 lbf•ft).
F01E1FD
1
2
F06D1YA
1
2
1
F06D1YB
7
4
1
5
8
2
3
6
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Summary of Contents for GTX 4-TEC 5573 2002
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