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    Do coils have oil in them? 86 Merc 35hp.

    Replaced the coils (2) this morning and about 3 hours later I noticed something running down under one of the coils. I took it apart and the coil was covered with a light oil. Inside and outside the rubber cover. Wasn't there when I installed it. Brand new Sierra coils. I can't figure where this...
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    1986 35hp switch box part numbers

    My current switch box part number is339-7452A8. I am finding part numbers that will replace for instance, 339-7452A7 and 339-7452A9 but will skip the A8 number. So what do the A numbers signify?
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    1986 Mercury 35 HP flywheel has no threads.

    My puller is of no use on this motor. Must have been a bad day when this motor was built. My searches found no alternative pullers. What can I use?
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    1986 35 HP Mercury loses spark on 1 cylinder

    1986 Mercury 35 HP. Model 1035716. Serial A951314. Crank the engine and I have spark on both cylinders for about 4 or 5 seconds then cylinder 1 dies. Stop cranking and recrank with the same results. I switched coils and the problem stays with the number 1 cylinder so the coils are OK. The switch...
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    86 Mercury 35 HP vibration around 1/2 throttle and up

    Re: 86 Mercury 35 HP vibration around 1/2 throttle and up Bottom yoke 43 is sloppy loose on shaft 18. I can get a 1/4 gap at the arrow. Maybe it's not the problem but I'm out of ideas. I thought maybe someone may have come across something like this before.
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    86 Mercury 35 HP vibration around 1/2 throttle and up

    The 35 HP Merc on my pontoon starts to vibrate around 1/2 throttle and up. I discovered if I push down or pull up on the engine cowling vibration noise will go away. A rubber strap hooked between the cowling and fence will solve the problem but the higher the RPM the tighter the strap needs to...
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    Vibrations

    We have a 1986 Bass Buggy with a 1986 40hp Mecury. Had this boat for 4 years and can't find the problem. Engine runs great for putting around a no wake lake but if we need to speed it up it starts to vibrate up thru the engine pod. Very loud. If I lift the back of the engine up away from the...
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    1986 35 HP Fuel Pump Port ~ Plugged?

    Motor idles fine for awhile than stumbles and quits. If I'm quick on the draw when it stumbles a few pumps on the bulb smoothes it right out. I pulled the fuel pump apart to replace the nasty looking diaphragm and found this port to be full of gunk. Should it be clear? I dug some of it out...
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    1986 Mercury 35 HP exhaust out?

    Acquired a pontoon with a 35 horse mercury that spits exhaust and water out two ports just below the powerhead at the back of the engine about 26 inches above the prop. All else normal, exhaust at prop and pees water good. Should exhaust and water be coming out of the engine at these two ports...
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