PIN 5S7598 - Caterpillar

Illustration 2 g01176673
Air inlet system (typical example)
(1) Turbocharger
(2) Air Inlet Piping
(3) Test location
(4) Air cleaner
Connect the vacuum port of the differential pressure gauge to the test location (3). Test location (3) can be located anywhere along air inlet piping (2) after engine air cleaner (4) but before turbocharger (1). The air flow through a new engine air cleaner element must not have a system restriction of more than the following amount: Maximum restriction ... 3.7 kPa (15 inch of H2O)The air flow through a used engine air cleaner may have an additional 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)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 muffler, or the catalytic converter/muffler to plug. A plugged muffler or a plugged catalytic converter/muffler will lead to an increase in exhaust back pressure. Operating the engine in extremely cold conditions may cause the muffler or the catalytic converter/muffler to plug. One indication of a plugged muffler or catalytic converter is poor engine response.Exhaust Back Pressure for Mufflers and Catalytic Converters
Back pressure is the difference in the pressure between the exhaust and the atmospheric air.
Table 2
Tools Needed
Part Number Part Name Quantity
1U-5470
or
198-4240 Engine Pressure Group
or
Digital Pressure Indicator 1
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.
If the exhaust is not equipped with a back pressure tap, the following procedure may be use in order to install a pressure tap. Refer to Truck Engine News, SEBD6729, "Measuring Exhaust Back Pressure" for measuring the back pressure at a proper test location.Use the differential pressure gauge of the 1U-5470 Engine Pressure Group or the 198-4240 Pressure Indicator Tool Gp in order to measure back pressure from the exhaust. Use the following procedure in order to measure back pressure from the exhaust:High Idle Plugging Test
Note: Do not try to burn out a plugged muffler. The muffler can become severely overheated. An overheated muffler will cause other system components to fail.
Inspect the system components for any noticeable damage that would cause a restriction.
Connect the pressure port of the differential pressure gauge to test location. Refer to Truck Engine News, SEBD6729, "Measuring Exhaust Back Pressure" for measuring the back pressure at a proper test location.
Leave the vacuum port of the differential pressure gauge open to the atmosphere.
Start the engine. Run the engine in the no-load condition at high idle until the engine reaches normal operating temperature.
Record the value.
Multiply the value