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Do not operate or work on this engine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Caterpillar dealer for replacement manuals. Proper care is your responsibility. |
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Keep hands clear of fan and belts while engine is running. |
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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. |
| Air inlet Vacuum Pressure Specifications | |
| Test location is anywhere on the air inlet pipe between the air filter and the turbocharger | |
| Maximum Vacuum Pressure | |
| For a used engine air cleaner | |
| For a new engine air cleaner | |
| Exhaust Outlet Pressure Specifications | |
| Test location is anywhere on the exhaust pipe between the exhaust manifold and the muffler | |
| Maximum pressure is |
This inspection checks the inlet air system for restrictions and checks the exhaust system for excessive back pressure.
| Required Tools | ||
| Part Number | Part Name | Quantity |
| 1U-5470 or 198-4240 |
Engine Pressure Group or Digital Pressure Indicator |
1 |
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.
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| Illustration 1 | g02571852 |
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Tooling (A) 198-4240 Digital Pressure Indicator Gp | |
| Most Recent Required Tools | ||||
|---|---|---|---|---|
| Tool | Item | Qty | Part No | Description |
| A | 198-4240 | Digital Pressure Indicator Gp | ||
| A1 | 1 | 198-4234 | Digital Indicator | |
| A2 | 1 | 198-4237 | Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi)) |
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| A2 | 1 | 198-4238(1) | Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi)) |
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| A2 | 1 | 198-4239 | Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi)) |
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| A2 | 1 | 251-9600(2) | Pressure Sensor Gp
(0 to 68,900 kPa (0 to 10,000 psi)) |
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| A3 | 1 | 198-4236 | Adapter Cable As | |
| (1) | This sensor must be purchased separately and is not included in the 198-4240 Digital Pressure Indicator Gp |
| (2) | This sensor can only be used on large diameter pressure taps like 6V-3965 Fitting. |
Remove all covers that obscure the air inlet and exhaust systems.
There will be a reduction in the performance of the engine if there is a restriction in the air inlet system or the exhaust system.
- 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.
- Use the differential pressure gauge of the 198-4240 Digital Pressure Indicator Gp.
- Connect the vacuum port of the differential pressure gauge to test location (2). Test location (2) can be located anywhere along the air inlet piping after the engine air cleaner but before the turbocharger.
- 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.
Show/hide table
Illustration 2 g01099496 Right side view of engine
(1) Air cleaner
(2) Test location
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 in 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 in of H2O)
Back pressure is the difference in the pressure between the exhaust at the outlet elbow and the atmospheric air.
Use the differential pressure gauge of the 198-4240 Digital Pressure Indicator Gp in order to measure back pressure from the exhaust. Use the following procedure in order to measure back pressure from the exhaust:
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| Illustration 3 | g01618348 |
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Right side view of engine (3) Catalytic converter/muffler (4) Test location (5) Exhaust piping (6) Turbocharger | |
- Connect the pressure port of the differential pressure gauge to test location (4). Test location (4) can be located anywhere along the exhaust piping after the turbocharger but before the muffler.
- 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.
- Record the value.
- Compare the result from Step 5 to the value that follows.
Back pressure from the exhaust must not be more than the following amount:
- Maximum back pressure ...
12.4 kPa (50 inch of H2O)