881309 Mercruiser CONTROL UNIT

Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     138-7574     Link Bracket     1    
B     6V-3145     Load Leveller     1    Start By:
Remove the crankcase guard. Refer to Disassembly and Assembly, SENR1381, "Crankcase Guards - Remove and Install".
Remove the center drive shaft. Refer to Disassembly and Assembly, SENR1381, "Drive Shaft (Center) - Remove and Install".
Remove the rear drive shaft. Refer to Disassembly and Assembly, SENR1381, "Drive Shaft (Rear) - Remove and Install".
Remove the muffler. Refer to Disassembly and Assembly, "Muffler - Remove and Install".
Remove the cab. Refer to Disassembly and Assembly, SENR1392, "Cab - Remove".
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin. At operating temperature, the engine coolant is hot and under pressure.Steam can cause personal injury.Check the coolant level only after the engine has been stopped and the cooling system pressure cap is cool enough to touch with your bare hand.Remove the cooling system pressure cap slowly to relieve pressure.Cooling system conditioner contains alkali. Avoid contact with the skin and eyes to prevent personal injury.
Note: Put identification marks on all lines, on all hoses, on all wires and on all tubes for installation purposes. Plug all lines, all hoses and all tubes. This will help to prevent fluid loss and this will help to keep contaminants from entering the system.
Drain the transmission oil into a suitable container. The capacity of the transmission is 34 L (9 US gal).
Drain the coolant from the cooling system. The capacity of the cooling system is 49 L (13 US gal).
Personal injury can result from contact with refrigerant.Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.Always use precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area.Personal injury or death can result from inhaling refrigerant through a lit cigarette.Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.
Recover the air conditioner refrigerant from the air conditioner system. Refer to Service Manual, SENR5664, "Air Conditioning and Heating Systems with R-134a Refrigerant" for the correct procedure. Refer to Special Publication, NEDG5065, "Air Conditioning Tools" for the correct tools.
Illustration 1 g00291305
Remove two clamps (1) .
Remove hose assembly (2) from the air conditioner dryer.
Illustration 2 g00291284
Remove two bolts and clamps (4). Disconnect cable (3) from the air inlet heater.
Illustration 3 g00291306
Disconnect line (5) from the starting aid. Disconnect electrical connector (6). Remove bolt (7) and the clamp from the heater hoses.
Illustration 4 g00291308
Remove four bolts (8) and cover (9) from the electrical box.
Illustration 5 g00291309
Remove fo