40019108 Mercury SCREW, SWITCH BOX TO CYLINDER BLOCK

Scheduled Oil Sampling (S O S) Analysis
For the 3408 deep sump engines and for the 3412 engines, this maintenance can be performed Every 500 Hours.Obtain Sample and Analysis
To compliment a good preventive maintenance program, Caterpillar recommends using S O S oil analysis at regular scheduled intervals to monitor the condition and maintenance requirements of your engine.Each oil sample should be taken when the oil is warm and well mixed to ensure that the sample is representative of the oil in the crankcase.
Typical oil sampling valve.To obtain S O S samples:* Use the oil sampling valve (if equipped)* Use a sampling gun inserted into the sump* Use the drain stream when changing oilCaterpillar recommends using the first or second method. If these methods are not feasible, then use the drain stream method. When using the drain stream method to obtain the oil sample, do not sample from the first or final draining. The oil at the beginning or end of the drain stream is not mixed well enough to be representative of the oil in the crankcase.Consult with your Caterpillar dealer for complete information and assistance in establishing an S O S program for your engine.Engine Crankcase
For the 3408 deep sump engines and for the 3412 engines, this maintenance can be performed Every 500 Hours.This maintenance should be performed on as level a surface as possible.Replace Oil and Filter(s)
Do not drain oil when the engine is cold. As oil cools, suspended waste particles settle on the bottom of the crankcase or oil pan. The waste particles are not removed with the draining cold oil. Drain the crankcase with the engine stopped and the oil warm. This allows for the draining of the waste particles that are suspended in the oil.Failure to follow this recommended procedure would result in these waste particles being recirculated through your engine lubrication system with the new oil.Drain Oil
Do not allow the oil to drain into the bilge sump.
After the engine has been run at normal operating temperature, STOP the engine. The method you use to drain your engine's crankcase oil depends on your engine equipment.* If equipped with a drain valve, turn the valve knob counterclockwise (CCW) to drain the oil. After the oil has drained, turn the valve knob clockwise (CW) to close the drain.* If not equipped with a drain valve, remove the oil drain plug(s) and allow the oil to drain. After the oil has drained, clean the oil drain plug(s). Clean the oil drain plug fitting(s). Install the oil drain plug(s). Tighten the plug(s) to 80 11 N m (60 8 lb ft).* If a sump pump is used: 1. Connect a suitable drain line to the pump outlet. Ensure that the oil will drain into a suitable container.2. With the engine stopped and the oil warm, open the sump pump valve to the engine crankcase drain line. The two marks on the valve must be turned so that one mark points to the pump, and the second mark points to the engine crankcase drain line.3. Operate the pump handle until the crankcase is empty.4. Close the pump valve to the engine crankcase drain line.Replace Filters
Replace the oil filters at every oil change. Make sure to use the correct oil filters for your engine arrangement. Refer to the Duplex Oil Filters topic in this publication if your engine is equipped with duplex oil filters.
Caterpillar oil filters are built to Caterpillar specifications. Use of an oil filter not recommended by Caterpillar could result in severe engine damage to your engine bearings, crankshaft, etc., as a result of the larger debris particles from unfiltered oil entering your engine lubricating system. Only use oil filters recommended by Caterpillar.
1. Remove the oil filter with a 1U-8760 Chain Wrench.
Element with debris.2. Cut the oil filter open with a 4C-5084 Oil Filter Cutter. Spread the pleats apart and inspect the element for metal debris. An excessive amount of debris in the oil filter element may indicate early wear or a pending failure.Use a magnet to differentiate between the ferrous and non-ferrous metals found in your oil filter element. Ferrous metals may indicate wear on the steel and cast iron parts of your engine.Non-ferrous metals may indicate wear on the aluminum, brass or bronze parts of your engine, such as main and rod bearings, turbocharger bearings and cylinder heads.Due to normal wear and friction, it is not uncommon to find small amounts of debris in the oil filter element. Consult your Caterpillar dealer to arrange for further analysis if an excessive amount of debris is found in your oil filter element.
Typical filter mounting base and filter gasket.3. Clean the sealing surface of the filter mounting base. Make sure all of the old gasket is removed.4. Apply clean engine oil to the new filter gasket.
Do NOT fill the oil filters with oil before installing them. This oil would not be filtered and could be contaminated. Contaminated oil will cause accelerated wear to engine components.
5. Place the filter in position. Tighten the filter until the gasket contacts the base. Tighten the filter 3/4 of a turn more (270 degrees) by hand. Do not over tighten.Fill Crankcase
1. Remove the oil filler cap. Refer to Lubricant Specifications for the proper oil to use for this engine. Fill the crankcase with the proper amount of oil (refer to the Refill Capacities chart).
If equipped with an auxiliary oil filter or system, extra oil must be added when filling the crankcase. Follow the OEM or filter manufacturer's recommendations. If the extra oil is not added, the engine may starve for oil.
To prevent crankshaft or bearing damage, crank engine to fill all filters BEFORE starting. Do Not crank engine for more than 30 seconds.
2. Start and run the engine at LOW IDLE for two minutes to ensure the lube system (including auxiliary filters, etc.) has oil and the oil filter(s) are filled. Inspect for oil leaks.3. Stop the engine and allow the oil to drain back to the sump for a minimum of