0207007 EVINRUDE PLATE,Applique,front

Measurement Of Pressure In Inlet Manifold
Table 1
Tools Needed    
Part Number    Part Description    Qty    
1U-5470     Engine Pressure Group     1    
8J-7844     Adapter Fitting     1    
3K-0360     O-Ring Seal     1    
4M-5317     Terminal Bushing     1    The efficiency of an engine can be checked with a comparison of the pressure in the inlet cover and the information in the Technical Marketing Information (TMI).This test is used when there is a decrease of horsepower from the engine, yet there is no actual sign of a problem with the engine.The correct pressure for the inlet manifold is also given in the Technical Marketing Information (TMI), "Fuel Setting and Related Information". These standards are established under the following conditions:
99 kPa (29.7 inches) of Hg dry barometric pressure
29 °C (84 °F) outside air temperature
35 API rated fuelAny change from these conditions can change the pressure in the inlet manifold. The outside air may have a higher temperature and a lower barometric pressure than the values that are given above. This will cause a lower inlet manifold pressure measurement than the pressure in the TMI. Outside air that has both a lower temperature and a higher barometric pressure will cause a higher inlet manifold pressure measurement.A difference in fuel density will change horsepower (stall speed) and boost. If the fuel is rated above 35 API, the pressure in the inlet manifold can be less than the pressure that appears in the TMI.If the fuel is rated below 35 API, the pressure in the inlet manifold can be more than the pressure that appears in the TMI. Ensure that the air inlet and the exhaust manifold do not have an air restriction when you check the pressure.Note: The electronic service tool may also be used to check the pressure in the inlet manifold.
Illustration 1 g00295554
1U-5470 Engine Pressure Group To check the inlet cover's pressure, remove one of plugs on the top of the inlet cover. Connect the following items to this opening:
Adapter
Seal
Reducing bushing
1U-5470 Engine Pressure Group The 1U-5470 Engine Pressure Group has a gauge that indicates pressure inside the inlet cover. Instructions for using this tool group appear in the Special Instructions, SEHS8907.Checking the Operation of the Aftercooler
Illustration 2 g00509120
4C-6500 Digital Thermometer Use the 4C-6500 Digital Thermometer to check the operation of the aftercooler. Refer to Special Publication, NEHS0554 for more information on the testing procedure.Air-to-Air Aftercooled Systems
Table 2
Tools Needed    
Part Number    Part Description    Qty    
FT-1984     Air-to-Air Aftercooler Leak Test Group     1    
FT-1438     Engine Dynamometer Test     1    Visual Inspection
Inspect the following components of the air-to-air aftercooler system:
Lines
Hoses
Gasket jointsEnsure that the constant torque hose clamps are tightened to the correct torque.
Pressurized air can cause personal injury. When pressurized air is used for cleaning, wear a protective face shield, protective clothing, and protective shoes.
Note: Whenever any parts for the air-to-air aftercooler system are replaced, perform a leak test. Also perform a test when one of these parts has been repaired.Check the welded joints for any cracks. Check the brackets for correct positioning. Also, ensure that these brackets are in good condition. Use compressed air to clean any debris or any dust from the aftercooler core assembly. Inspect the aftercooler core assembly's fins for the following conditions:
Damage
DebrisUse a stainless steel brush to remove any corrosion. Ensure that you use soap and water.
Pressurized air can cause personal injury. When pressurized air is used for cleaning, wear a protective face shield, protective clothing, and protective shoes.
Note: When air-to-air aftercooler parts are repaired and air-to-air aftercooler parts are replaced, a leak test should be completed. Air System Restriction
Periodically, take pressure measurements at the turbocharger outlet and at the inlet manifold. The air lines and the cooler core must be inspected for internal restriction under both of the following conditions:
The air flow is at a maximum level.
The total air pressure's drop of the charged system exceeds 13.5 kPa (4 in Hg).If a restriction is discovered, inspect the cooler core for cleaning, for repairing, and for replacement needs, as required.Turbocharger Failure