34273 Mercruiser GASKET, CYLINDER HEAD TO CYLINDER BLOCK

The oil change interval will be affected by the following items:
Engine application
Fuel type
Oil type
Ambient air conditions
Air/fuel ratio
Size of the oil sump
Table 1
C175Engine Oil Change Interval
Sump Configuration Interval
Standard Every 92 days The S O S oil analysis program analyzes used oil to determine if the oil change interval is suitable for your specific engine.Drain the Engine Oil
Do not drain the oil when the engine is cold. As the oil cools, suspended waste particles settle on the bottom of the oil pan. The waste particles are not removed when the cold oil is drained. Drain the crankcase when the oil is warm. This draining method allows the waste particles that are suspended in the oil to be drained properly.Failure to follow this recommended procedure will allow the waste particles to be recirculated through the engine lubrication system with the new oil.
After the engine has been operated at normal operating temperature, STOP the engine.
Drain the oil according to the equipment on the engine.Note: The threads that are provided on the drain valve are metric. Drain the oil into a suitable container. Dispose of the oil according to local regulations.
Illustration 1 g06042521
Oil drain plugs (1) may be used to drain the oil. After the oil has drained, close the oil drain and/or reinstall the drain plug.
If a suction device is inserted into the oil pan, ensure that the suction device is clean. The suction device will prevent dirt from entering into the oil pan. Be careful not to strike the engine oil suction tubes or the piston cooling jets.
If a suction device that attaches to the oil drain is used, ensure that the suction device is clean. Attach the suction device to the oil drain. Open the oil drain. After the oil has drained, close the oil drain and remove the suction device.Replace the Oil Filter Elements
Replace the engine oil filters when either of the following conditions are met:
Every oil change
The engine oil filter differential pressure reaches 103 kPa (15 psi).Service tools are available to aid in the service of oil filters. Consult your Cat dealer for the part names and the part numbers. Follow the instructions that are supplied with the service tools. If the service tools are not used, perform the following appropriate procedure.
Illustration 2 g06042536
(1) Bolts
(2) Cover
(3) Drain valveNote: Drain the oil into a suitable container. Dispose of the oil according to local regulations.
Connect a hose to drain valve (3). Place the other end of the hose into a suitable container to collect the oil.
Open drain valve (3). Allow the oil to drain. Clean the plug and install the plug. Close the drain valve. Remove the hose from the drain.
Personal injury can result from parts and/or covers under spring pressure.Spring force will be released when covers are removed.Be prepared to hold spring loaded covers as the bolts are loosened.
Note: Some oil will remain in the housing after the oil has been drained. This oil will pour out of the housing when cover (2) is removed. Prepare to catch the oil in a suitable container. Clean up any spilled oil with rags. DO NOT use absorbent particles to clean up the oil.
Be alert to the spring force. Gradually loosen but do not remove bolts (1). Before removing bolts (1), pry the cover (2) to loosen the cover. Loosening the cover will relieve any spring pressure. Remove cover (2). Remove the O-ring seal from inside the cover.
Clean cover (2) and clean the O-ring seal. Clean inside the oil filter housing.
Caterpillar oil filters are built to Caterpillar specifications. Use of an oil filter not recommended by Caterpillar could result in severe engine damage to the engine bearings, crankshaft, etc., as a result of the larger waste particles from unfiltered oil entering the engine lubricating system. Only use oil filters recommended by Caterpillar.
Install new oil filter elements.
Inspect the O-ring seal. Ensure that the surfaces for the O-ring seal are clean. Install a new O-ring seal if the old O-ring seal is damaged or deteriorated.
Install cover (2). Ensure that the springs are seated properly between the cover and the oil filter elements.Fill the Crankcase
Remove the oil filler cap and fill the crankcase. For the correct type and the amount of oil to use, refer to this Operation and Maintenance Manual (Maintenance Section), "Refill Capacities and Fluid Recommendations". Clean the oil filler cap. Install the oil filler cap.
Complete engine oil prelube cycle.
Follow the Operation and Maintenance Manual (Operation Section), "Starting The Engine" procedure. Operate the engine at low idle for 2 minutes. Operating the engine at low idle for 2 minutes will ensure that the lubrication system has oil and that the filters filled with oil. Inspect the engine for oil leaks. Ensure that the oil level is at the "FULL" mark on the "LOW IDLE" side of the oil level gauge.
Stop the engine and allow the oil to drain back into the sump for a minimum of 10 minutes.
Remove the oil level gauge and check the oil level. Maintain the oil level to the "FULL" mark on the "ENGINE STOPPED" side of the oil level gauge.Drain the Fuel Injection Pump Oil (Wet-Sump Pump)
Note: Perform the following procedure at the same interval as the engine oil and filter change.
Illustration 3 g06079846
Remove the oil drain plug (1). Allow the oil to drain into a suitable container.
Clean and reinstall the oil drain plug.