3838691 Volvo.Penta Engine control unit

Fuel Ratio Control
Inspect/Check
Inspect the fuel ratio control diaphragm for any sign of leaking. Check for any cracking or deterioration of the diaphragm.Slow engine response and low power may indicate a need for adjustment or repair. This adjustment should not be attempted by untrained personnel. Your Caterpillar dealer is equipped with the necessary tools, personnel and procedures to perform this service.Governor Set Point And Low Idle
Check/Adjust
The only on-engine adjustment to the governor is the low idle setting. All other governor adjustments are to be made during bench (off engine) testing. Refer to the Special Instruction SEHS8868 for procedures and tooling required for bench testing the governor.
These adjustments are to be made only by an authorized Caterpillar dealer or mechanic that has the correct training. A governor set point that is incorrectly adjusted could result in excessive fuel consumption.
Your Caterpillar dealer has all of the necessary equipment to check and adjust your governor. The Low Idle screw is normally set during the bench test procedure. However, if the low idle setting is not satisfactory, use 1U6672 Wrench to loosen the locknut and adjust screw to the desired low idle speed. Tighten the locknut and recheck the low idle setting. Refer to the Fuel Setting And Related Information Fiche for the correct low idle speed for your engine. This information can be obtained from your Caterpillar dealer.Top End Overhaul
According to the Maintenance Management Schedule, it's time to have your engine overhauled. However, with the exception of burning a little oil and experiencing a slight increase in fuel consumption, you are not having any other problems with your truck.The choice to continue running or to overhaul the engine is yours. But remember, component failures are inevitable. Maybe there won't be a failure in the immediate future, but there will be a failure at some point in time. The figures shown in the following scenario are based on certain assumptions for the purpose of presenting an example only.Your truck has 525,000 miles (845 250 km) on its 3406B Engine. If the truck runs for 75,000 more miles (120 750 km) and then fails, the repair cost will be between U.S. $0.0085 and $0.0153 per mile (km). However, if you choose to repair your engine before it fails, by performing an in-frame overhaul at a cost of U.S. $3700, the repair cost will only be U.S. $0.007 cents per mile (km). The difference between the repair before failure cost and the after failure cost is the result of damage to other engine parts when a major failure occurs. This is money that is not only wasted, but is money that could have been used more profitably elsewhere.By not performing an overhaul, you risk the chance of seizing a piston, breaking a rod, fatiguing a bearing or causing other severe damage to your engine. The cost to repair this damage could range from U.S. $5000 to $9000 and the amount of downtime encountered would exceed the amount of downtime required for a scheduled in-frame overhaul.Consider the alternatives: Spend U.S. $3700 to overhaul your engine, with minimal downtime, before failure or spend U.S. $5000 to $9000 in repairs, with several days of unscheduled downtime, after the engine fails.It is evident by this example, that overhauling your engine before failure is far less costly than the cost to overhaul your engine after failure.To further stress the importance of overhauling your engine before failure, an engine operating cost analysis was made to show the cost per mile (km) graphically. These graphs do not include the total downtime, lost contract, towing, replacement vehicle and related costs associated with after failure repairs. Legend
Dotted Line - The cost per mile (km) for a truck that is not maintained and overhauled as recommended. Solid Line - The cost per mile (km) for a truck that is maintained and overhauled before failure.As you can see, the cost per mile (km) for a truck that is not maintained and overhauled as recommended will ultimately cost you more to operate than a truck that is maintained and overhauled before failure. Charts reflect COST/MILE only. Conversion: 100,000 miles = 161 000 kmCaterpillar strongly recommends that you overhaul your engine before failure.Overhaul Programs
Your Caterpillar dealer may be offering a variety of options regarding overhaul programs. Caterpillar recommends that an In-Frame Overhaul be performed at this maintenance interval.Overhaul Before Failure (In-Frame Overhaul)
A planned in-frame overhaul may be your best value. You can: * Avoid costly unplanned downtime* Reuse as many original parts as standards permit* Extend your engine's service life* Get the best cost/value relationship per mile (km) of extended lifeThe cost of an in-frame overhaul is usually 20-25% of the cost of a new engine.Flat Rate Overhaul
To further control your in-frame overhaul costs, Caterpillar recommends that you contact your dealer for information regarding the availability of a Flat Rate Overhaul.A Flat Rate Overhaul is not really a type of overhaul but a program that guarantees the maximum price you will pay for an in-frame overhaul. Flat Rate Overhauls will help you control costs.Flat rate prices on preventive maintenance programs or major repair options are available from many servicing dealers for all Caterpillar Truck Engine models.Overhaul Options
Caterpillar Dealer - Contact your Caterpillar dealer to schedule a before failure overhaul. Overhaul Kit - This useful kit was developed for those users that prefer to perform their own overhaul. This kit includes a combination of new, reused and Remanufactured parts. Also included is a step-by-step instruction regarding how to perform an in-frame overhaul. An Overhaul Kit simplifies parts ordering, helps speed repairs and reduces parts costs.Contact your local Caterpillar dealer for information regarding the Overhaul Kit.Overhaul Before Failure (In-Frame Overhaul)
Overhaul Recommendation
To minimize downtime and provide you with the lowest cost and highest value, Caterpillar recommends that the engine be overhauled before failure by scheduling an overhaul with your Caterpillar dealer. Overhaul programs vary from dealer to dealer. Therefore, Caterpillar recommends that you confer with your dealer to obtain specific information regarding the types of programs offered and overhaul services provided