Piper Dakota Maintenance Manual page 529

Removal of tail pipe and stacks is required for inspection of the muffler baffle. Remove or loosen all
exhaust shields, carburetor, and cabin heat muffs, shrouds, heat blankets, etc., as required to permit inspection
of the system. Clean and inspect all external surfaces for dents, cracks, and missing parts.
Apply Fel-Pro Type C5-A anti-seize lubricant to entire slip joint
surface on both sides of muffler to prevent slip joint binding.
Pay particular attention to welds, clamps, supports, and support attachment lugs, slip joints, stack flanges,
and gaskets. Inspect internal baffle or diffusers. Any cracks, warpage, or severe oxidation are cause for
replacement.
If any component is inaccessible for a visual inspection, conduct one of the following:
1. Conduct a submerged pressure check of muffler and exhaust stack at 2 psi air pressure.
2. Conduct a ground test using a carbon monoxide indicator. Head airplane into the wind. Warm engine
on the ground. Advance throttle to full static RPM with cabin heat valves open, and take readings of
heated airstream inside cabin at each outlet (including rear seat heat outlet, if installed). Appropriate
sampling procedures applicable to the particular indicator must be followed. If carbon monoxide
concentration exceeds 0.005 percent or if a dangerous reading is obtained on an indicator not
calibrated in percentages, the muffler must be replaced.
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
—CAUTION—
—END—
2K13
78 - 01 - 00
Page - 78 - 02
Reissued: August 1, 1986