0323480 EVINRUDE SCREW,Air silencer base

Table 1
Required Tools    
Part Number    Part Name    Quantity    
1U-5470
or
198-4240     Engine Pressure Group
or
Digital Pressure Indicator     1    
Illustration 1 g00293196
1U-5470 Engine Pressure Group Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group " for the instructions that are needed to use the 1U-5470 Engine Pressure Group. Refer to Operation Manual, NEHS0818, "Using the 198-4240 Pressure Indicator Tool Gp " for the instructions that are needed to use the 198-4240 Pressure Indicator Tool Gp .
Inspect the engine air cleaner inlet and ducting in order to ensure that the passageway is not blocked or collapsed.
Inspect the engine air cleaner element. Replace a dirty engine air cleaner element with a clean engine air cleaner element.
Check for dirt tracks on the clean side of the engine air cleaner element. If dirt tracks are observed, contaminants are flowing past the engine air cleaner element and/or the seal for the engine air cleaner element.
Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.
Making contact with a running engine can cause burns from hot parts and can cause injury from rotating parts.When working on an engine that is running, avoid contact with hot parts and rotating parts.
Use the differential pressure gauge of the 1U-5470 Engine Pressure Group .
Illustration 2 g00678913
Typical example (1) Turbocharger (2) Air inlet piping (3) Test location (4) Air cleaner
Connect the vacuum port of the differential pressure gauge to test location (3). Test location (3) can be located anywhere along air inlet piping (2) after engine air cleaner (4) but before turbocharger (1) .
Leave the pressure port of the differential pressure gauge open to the atmosphere.
Start the engine. Run the engine in the no-load condition at high idle.
Record the value.
Multiply the value from Step 4.d by 1.8.
Compare the result from Step 4.e to the appropriate values that follow.The air flow through a used engine air cleaner may have a restriction. The air flow through a plugged engine air cleaner will be restricted to some magnitude. In either case, the restriction must not be more than the following amount: Maximum restriction ... 6.2 kPa (25 inch of H2O)The air flow through a new engine air cleaner element must not have a restriction of more than the following amount: Maximum restriction ... 3.7 kPa (15 inch of H2O)Exhaust Restriction
The muffler and converter will become extremly hot during engine operation. A hot muffler and converter can cause serious burns. Allow adaquate cooling time before working on or near the muffler and converter.
Excessive idling can cause the catalytic converter/muffler to plug. A plugged catalytic converter/muffler will lead to an increase in exhaust back pressure. Operating the engine in extremely cold conditions may cause the catalytic converter/muffler to plug. One indication of a plugged catalytic converter/muffler is poor engine response. If the engine is operated at low idle or at low load for 24 or more consecutive hours, the engine should be run at rated conditions for five to fifteen minutes. Running the engine at rated conditions should clean out the catalytic converter/muffler. Exhaust Back Pressure
Back pressure is the difference in the pressure between the exhaust and the atmospheric air.
Table 2
Required Tools    
Part Number    Part Name    Quantity    
1U-5470
or
198-4240     Engine Pressure Group
or
Digital Pressure Indicator     1    
Illustration 3 g00293196
1U-5470 Engine Pressure Group Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group " for the instructions that are needed to use the 1U-5470 Engine Pressure Group. Refer to Operation Manual, NEHS0818, "Using the 198-4240 Pressure Indicator Tool Gp " for the instructions that are needed to use the 198-4240 Pressure Indicator Tool Gp.
Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.