5.
Attach the lead wires to their appropriate terminals of the instrument

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3I24

CHAPTER

78

EXHAUST

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CHAPTER 78 - EXHAUST 
TABLE OF CONTENTS / EFFECTIVITY 
CHAPTER/ SECTION  SUBJECT  GRID NO.  EFFECTIVITY 
78-00-00  GENERAL  3I5 
Description Leak Test of Muffler  3I5 3I5  1R0202 

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3J4
GENERAL.
DESCRIPTION.
This exhaust system is a muffler system, exhaust gases are discharged through an opening in the center of the lower cowl.  A heat shroud is installed for an alternate air heat rise for the carburetor.  For removal of the exhaust system, the following procedures may be performed:
1.
Remove lower cowl.

2.
Remove hardware from the alternate air tube and disconnect tube from shroud.

3.
Remove hardware attaching exhaust system to engine, remove exhaust system.

4.
Reinstall the exhaust system in reverse of removal instructions.

LEAK TEST OF MUFFLER.
— Note —
Inspect each muffler slip joint for excessive exhaust leakage (See Figure 78-1). Minor discoloration and leakage is normal. If excessive leakage is evident, repair (in accordance with latest revision of AC 43.13-1) or replace as required.
Each muffler should be subjected to the following leak test:
1.
Plug muffler inlets.

2.
Connect low pressure air supply to outlet (approximately 2 psi).

3.
Submerge the muffler in water.

4.
Repair or replace any muffler that leaks.

5.
Upon completion of repairs, retest mufflers.

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78-00-00 Page 78-6 Issued: April 1, 1997
3J6

CHAPTER

79

OIL

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CHAPTER 79 - OIL 
TABLE OF CONTENTS / EFFECTIVITY 
CHAPTER/ SECTION  SUBJECT  GRID NO.  EFFECTIVITY 
79-20-00  DISTRIBUTION  3J11 
Oil Cooler Installation  3J11 3J11 
79-30-00  INDICATING  3J11 
Oil Pressure Senders Removal Testing Installation  3J11 3J11 3J11 3J12 
Engine Oil Pressure Gauge Troubleshooting Removal and Replacement Calibration  3J12 3J13 3J13 3J13 
Oil Temperature Gauge Troubleshooting Removal and Replacement Calibration  3J15 3J15 3J15 3J15 

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79-Cont./Effec. Page 79-4 Issued: April 1, 1997
3J10
DISTRIBUTION.
OIL COOLER.
INSTALLATION OF OIL COOLER.
1.
When installing fittings in the oil coolers, care should be used to prevent excessive torque being applied to the cooler.  When a rectangular fitting boss is provided, a backup wrench should be used, employing a scissor motion, so that no load is transmitted to the cooler.  When the oil cooler has a round fitting boss, care should be taken not to permit excessive torque on the fittings.

2.
If a pipe thread fitting is used, it should be installed only far enough to seal with sealing compound.

3.
Apply Lubon No. 404 to all male pipe thread fittings, do not allow sealant to enter the system.

4.
When installing hoses and fittings make sure a minimum of .5 inch clearance is maintained between hose and engine mount, and .12 inch between hose and oil filter case.

5.
If fitting cannot be positioned correctly using a torque of 10 to 15 foot-pounds, another fitting should be used.

6.
When attaching lines to the cooler, a backup wrench should be used.

7.
After installation, inspect the cooler for distorted end cups.

8.
Run-up engine, after run-up check for oil leaks.

— Note —
Winterization plates should be installed between oil cooler seal and engine baffle when ambient temperature is below 50° F.
INDICATING.
OIL PRESSURE.
REMOVAL OF OIL PRESSURE SENDERS.
There are two sending units for each engine.  One for oil pressure and the other for a warning light.  Both units are mounted on a common manifold located behind each engine firewall.  The upper unit is for the pressure gauge and the lower unit is for the warning light.  Access to the units is through access panels on each side of the forward nacelle.  Removal is accomplished by the following:
1.
Disconnect the electrical leads from the particular unit.  It is suggested that the leads be marked for easy connection upon reinstallation of the sensor.
　
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