This Seloc repair manual covers 1977-1989 Mariner Outboard motors 1- and 2-cylinder, 2 to 60 HP, 2-Stroke.
Book Excerpt: 1977-1989 Mariner Outboard Motor Repair Manual 1- and 2-Cylinder 2-60 HP 2-Stroke
TROUBLESHOOTING | EXCESSIVE FUEL CONSUMPTION
Excessive fuel consumption can be the result of any one of three conditions, or a combination of all three.
If the fuel consumption suddenly increases over what could be considered normal, then the cause can probably be attributed to the engine or boat and not the operator.
- Inefficient engine operation.
- Faulty condition of the hull, including excessive marine growth.
- Poor boating habits of the operator.
Marine growth on the full can have a very marked effect on boat performance. This is why sail boats always try to have a haul-out as close to race time as possible. While you are checking the bottom, take note of the propeller condition. A bent blade or other damage will definitely cause poor boat performance.
If the hull and propeller are in good shape, then check the fuel system for possible leaks. Check the line between the fuel pump and the carburetor while the engine is running and the line between the fuel tank and the pump when the engine is not running.
A leak between the tank and the pump many times will not appear when the engine is operating, because the suction created by the pump drawing fuel will not allow the fuel to leak. Once the engine is turned off and the suction no longer exists, fuel may begin to leak.
If a minor tune-up has been performed and the spark plugs, points, and timing are properly adjusted, then the problem most likely is in the carburetor and an overhaul is in order.
Check the needle valve and seat for leaking. Use extra care when making any adjustments affecting the fuel consumption, such as the float level or automatic choke.
DISASSEMBLE CRANKING MOTOR
CRANKING MOTOR REMOVAL | MODEL 28HP, 48HP, 55HP, AND 60HP
Disconnect both positive and negative battery cables. Disconnect the large Black negative cable from the solenoid ground terminal. Disconnect the large Red positive cable, the small Red wire, and the small Orange wire (all on one eyelet connector) from the positive terminal on the solenoid. Disconnect the other small Red wire from the ignition terminal on the solenoid.
Remove the four cranking motor securing bolts and lift the motor free of the power head.
CRANKING MOTOR DISASSEMBLING
The exploded drawings on Page 8-15 and 8-16 will be most helpful while performing the following procedures.
- Slide the "boot" clear of the solenoid terminal. Loosen the terminal nut on the solenoid and slide the cranking motor lead free of the terminal.
- Remove the two bolts and washers securing the solenoid to the cranking motor nose cone.
- "Wiggle" the solenoid plunger free of the yoke arm. Once the plunger is free, remove the torsion spring. Separate the solenoid from the nose cone. Remove and SAVE the spacers atop the solenoid.
- With the cranking motor on a work surface, pry the snap ring out of its groove and free of the armature shaft.
Subject: 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989 Mariner Outboard 1- and 2-Cylinder 2-60 HP 2-Stroke Motors service, maintenance, repair. ISBN-10: 0893300152 | ISBN-13: 9780893300159 | Seloc 1400