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    850 timing

    As Racerone said, set top cylinder to TDC with a dial pointer or caliper. Now remove distributor pully cover and see where cast arrow points. Remove timing belt if necessary to make arrow point to TDC dot on flywheel decal. Now remove rest of spark plugs. install top spark plug into engine...
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    Gauges

    Some I/Os have a temp alarm sender as well as a temp gauge sender. temp alarm sender will short to ground when the motor overheats. Do you have the temp gauge wired to the correct sender?
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    Problem with Sierra riser 18–19 36

    After you get the riser off, if the mounting surface of the casting is not rotted away, you can true it up on some plate glass with sandpaper on it. Ditto on the manifold as well, which should be trued up. Use the heavier OEM gaskets, as they work very well.
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    Cavitation plate

    Most planning boats will wander at low speed. The cure is to make small steering adjustments to average a straight path. It is the nature of the thing. The horizontal plate above the prop in an antiventilation plate. It is designed to keep air from being sucked into the prop. The best way...
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    Fuel leaking when motor tilted.

    It does sound like fuel delivery issue. Pump the primer bulb when at full speed. If she maintains top speed, that confirms fuel delivery issue. If moving the tank closer doesn't fix it, you may want to rebuild the fuel pump. They do not last forever. If primer bulb collapses, you have fuel...
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    Johnson V4 swivel grease

    I had the same issue on my Mercury. I was able to mitigate it (not fix it), by tilting the motor up. Now I tied a rope around the antiventilation plate and transom bracket and tightened it like a tourniquet. Turn the steering while tigntening the rope. This forced the motor up on the...
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    Outboard throttle lever loose (sideways movement)

    Go onto the OEM web page for that control. A lot of them allow the throttle handle to be mounted on both sides of the control box, for dual engines. As such they can be removed and tightened.
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    Fuel leaking when motor tilted.

    When you say surges, do you mean that the motor runs up to full speed upon initial acceleration, and then slows a bit, an then runs back up to full speed?
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    1974 mercury 115 in line 6

    Check the distributor pully cover. They can get loose and rattle. A bit of blue locktight on that bolt and the flexplate bolts works wonders.
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    Floor Joint Design?

    You are going to cover the plywood with glass and resin right. That adds lots of strength, Are you installing foam under the deck? if not, why not? If you are using 1/2" plywood, foam and glass/resin, no joint reinforcement is necessary
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    Using Neoprene Strips to Cushion Marine Gas Tank

    How about self stick weather stripping? Should work about the same and be much easier.
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    Fuel leaking when motor tilted.

    Most/all of my outboards leak fuel when tilted. Some more than others. My I6 even had a fuel catch basin under the carbs. Floats and inlet needles do not last forever. They are maintenance items. Perhaps yours's are worn out. Can you leave the motor tilted down, when fishing? That saves...
  13. C

    Fuel Line Drained the tank

    Gee, fix the leak in the fuel supply system under the cowling.
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    Fuel leaking when motor tilted.

    That is normal. Floats only seal the inlet needle, when they can float (hence the name). When you tilt the motor, the floats cannot float normally. Why are you pumping the primer bulb with the motor tilted?
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    Intermittent Trim issue - late 80s Mercury 115

    OK, too many problems to diagnose at once, with the description given. First of all, what year is motor? Does it have 50cent piece-sized round electrical connector or external quick disconnect plug on motor? Check engine wiring harness for failing insulation.
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    Fuel Line Drained the tank

    For fuel to siphon, the end of the fuel hose needs to be lower than the fuel level in the tank. If the fuel line doesn't leak, and it is connected to the motor, which is higher than the fuel level, it should not siphon. Have you checked under the motor cowling for leaks? Is the motor running...
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    Steering intermittently hard/pulls to left, and leaky ram.

    Since you have not replies, here is my guess. Most boats pull right. Trim can help that. However, power steering eliminates that pull. The hard steering you are experiencing may be that the PS belt slips, turning off the PS. Or it could be a pocket of air in the ram. I think the fix is to...
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    Broken skeg and play in prop shaft.

    You did hit that hard. You should be able to get a new skeg welded on. Look for a replacement at Mercruiser. You will want to pull the drive and take it to a good welder. A good welder will not need to drain the gear oil or strip the gearcase. He can weld the new skeg over the old one...
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    tilt/trim units

    The trim limit switch on those Alpha units in on one of the pivot points of the outdrive that is submerged. It is under a plastic cover. Likely the switch guts have gone bad. The other pivot point is the trim gauge sender. It is a copper pointer and coil that moves as the drive trims up/down.
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    Shifter question?

    I suspect that the throttle may move further in forward, but what is the point of the question? Would you want to keep the shifting backwards?
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