874143 Volvo.Penta Housing

Cold Mode Operation
A truck equipped with a 3176 Engine, which after it has completed the cold mode and the cold mode is disabled, cannot be enabled again until the ECM is powered OFF.
The cold start strategy will be activated when the coolant temperature is below 63°F (17°C). Once activated, it will continue until the coolant temperature reaches 82°F (27°C), or until the engine has been running for 12 minutes. This strategy involves the following steps.The 3176 system automatically idles the engine at 1000 rpm for the correct warm up time after a cold engine start. The 3176 system checks the engine coolant temperature sensor and will reduce the idle speed to programmed low idle speed when the engine is warm enough to drive the truck.1. The engine power available is reduced when the engine is in Cold Mode.2. If the cold start strategy is active and the ECM measures a vehicle speed, cold mode rpm will be de-activated.3. A timer will disable the cold mode strategy after 12 minutes. The time needed for the engine to reach the normal mode of operation is usually less than the time taken for a walk-around-inspection of the vehicle.After Cold Mode strategy is completed, the truck should be operated at low rpm and low power until normal operating coolant temperature 175° to 205°F (79° to 98°C) is reached.The engine will reach operating temperature faster when driven at low rpm and low power demand than when idled at no load. Typically the engine should reach operating temperature when driving through the yard toward the open road.If the engine speed is not controlled by the PTO governor function while in the cold mode, the engine idle will be reduced to programmed low idle automatically when the cold mode is completed.Engine Operation
* Begin operating the engine at low load. After normal oil pressure is reached and the temperature gauge begins to move, the engine may be operated at full load.* To get the vehicle in motion, use a gear that will result in a smooth, easy start to move the load without increasing engine speed above low idle or slipping the clutch. Engage the clutch smoothly. Interrupted slipping and abrupt clutch engagement put stress on the drive train and waste fuel. It is not necessary to advance the throttle to get the 3176 equipped truck moving from a stop in most instances.* Use progressive shifting to reduce fuel consumption. Progressive shifting is using only the rpm required to make an upshift into the next gear. The amount of rpm required to make an upshift increases as the truck speed increases unless upshifts are made on upgrades. Experience with your truck will show you how much rpm is required to make upshifts under various conditions. Your 3176 engine may be programmed for Low and High Gears RPM Limiting (progressive shift control).* If the truck can be operated in a higher gear after the desired speed is reached, select the highest gear available that will pull the load. By following this recommendation, you will lower your fuel costs. Your engine will be operating at the lowest rpm required to pull the load. Your 3176 engine may be programmed so that Vehicle Speed Limit (VSL) cannot be achieved in less than high gear.Uphill Operation
For best performance when climbing a hill, allow the engine to lug down to peak torque (1100 to 1300 rpm) speed before downshifting and do not be afraid to let the engine run at low rpm if the truck will make the top without a downshift.Fuel economy will be best if you let the engine lug back to around this speed before you downshift. Downshift until a gear is reached in which the engine will pull the load. This technique will also operate the engine through the most fuel efficient speed range.Minimize the number of downshifts. Vehicle speed (momentum) is always lost between downshifts. Therefore, unnecessary downshifts waste a portion of that fuel consumed to maintain vehicle speed in the previous gear. Your Caterpillar engine has a very broad usable speed range and excellent torque rise that will provide exceptional hill climbing capability.Allowing the engine to lug below peak torque is permissible if the truck is cresting the top of a hill without downshifting. However, note that extended operation in a lug condition will raise exhaust temperature and cylinder pressure. This can lead to reduced engine life.Downhill Operation
Do NOT allow the engine rpm to exceed 2300 rpm, engine damage can result.If equipped with an exhaust brake, do not exceed 2100 rpm.
When cresting a hill, the decision of whether to use power or not on the downside of the hill must be made. Best fuel economy results from using minimum power to get back to speed after climbing a grade. However, care must be taken not to allow the engine to overspeed. The Cruise Control may use full engine power to return the truck to the cruise set speed if the engine was unable to maintain the set speed while climbing a hill. The cruise control should be turned OFF before cresting the top of a hill and light throttle used to regain vehicle speed on a downhill to minimize fuel consumption.* On a downgrade, do not coast with the clutch disengaged or put the transmission in NEUTRAL.* Select the correct gear that does not allow the engine speed (rpm) to exceed the limits above and use the engine retarder and/or brakes to limit the speed of the truck.* A simple rule to follow is to select the same gear that would be required to go up the hill. However, DO NOT allow the engine to overspeed.For more information on economical operation of this engine, refer to form LEDT5092, Driving Techniques for Maximum Fuel Economy.Saving Fuel On Hills
Rolling hills provide a great opportunity to reduce fuel consumption. Avoid downshifting on small hills. If a hill can be topped without downshifting, even if the engine lugs to the peak torque rpm (1100 to 1300), the truck should