34488 Mercruiser PLUG, EXPANSION-CAMSHAFT BEARING HOLE

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over any disconnected fuel system components.
Do not fill the primary fuel filter with fuel before installing. The fuel would not be filtered and could be contaminated. Contaminated fuel will cause accelerated wear to fuel system parts.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Cat Dealer Service Tool Catalog" or refer to Special Publication, PECJ0003, "Cat Shop Supplies and Tools Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Cat Primary Fuel Filter and Water Separator
Close the main fuel supply valve.
Illustration 1 g01453091
(1) Element
(2) Bowl
(3) Drain
Remove element (1) from the element mounting base while bowl (2) is attached.
Dispose of the contents of the filter. Remove bowl (2) from element (1). The bowl is reusable. Do not discard the bowl. Dispose of the used element.
Remove the O-ring from the gland of the bowl. Clean the following components:
Bowl
O-ring
Mounting baseInspect the O-ring for damage and for deterioration. If necessary, replace the old O-ring with a new O-ring.
Lubricate the O-ring with clean diesel fuel. Place the lubricated O-ring into the gland of the bowl.
Install bowl (2) on a new element. Tighten the bowl by hand. Do not use tools in order to tighten the bowl.
Lubricate the top seal of element (1) with clean diesel fuel. The element may be filled with fuel at this time. Install the new element on the mounting base. Tighten the element by hand.
The water separator is under suction during normal engine operation. Ensure that the vent plug is tightened securely to help prevent air from entering the fuel system.
Start the engine and check for leaks. Run the engine for 1 minute. Stop the engine and check for leaks again. Detecting leaks is difficult while the engine is running. The primary filter/water separator is under suction. A leak will allow air to enter the fuel. The air in the fuel can cause low power due to aeration of the fuel. If air enters the fuel, check for loose components or overtightening.Primary Fuel Filter and Water Separator which are Provided by an OEM
Close the main fuel supply valve.
In order to replace the primary fuel filter, use the instructions which are provided by the OEM.
Open the main fuel supply valve.
Start the engine and check for leaks. Run the engine for 1 minute. Stop the engine and check for leaks again. Detecting leaks is difficult while the engine is running. The primary filter/water separator is under suction. A leak will allow air to enter the fuel. The air in the fuel can cause low power due to aeration of the fuel. If air enters the fuel, check for loose components or overtightening.