Exhaust Bypass Valve - Adjust
The exhaust bypass valve is preset at the factory. However, adjustments may be necessary due to the following circumstances:
- Replacement of the exhaust bypass valve
- Altitude
- Changes in the ambient temperature
Use the following procedure to adjust the exhaust bypass valve for local conditions.
- Remove plug (1) and the seal. Loosen locknut (2).
- Turn adjustment screw (3) clockwise for approximately four turns in order to remove the function of the exhaust bypass valve. Be careful not to tighten the screw too far.
- Adjust the engine's exhaust emissions according to Systems Operation/Testing and Adjusting, "Air/Fuel Ratio Control - Adjust (Oxygen Feedback)" or Systems Operation/Testing and Adjusting, "Air/Fuel Ratio Control - Adjust (Charge Density)".
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Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
- After the desired exhaust emissions are obtained, turn adjusting screw (3) counterclockwise in order to obtain full load operation with a throttle angle of approximately 70 degrees.
- When the operation is satisfactory, tighten locknut (2) to the torque that is listed in the engine's Specifications.
- Install the seal and plug (1).
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| Illustration 1 | g00814530 |
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(1) Plug
(2) Locknut (3) Adjustment screw | |
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