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    1977 power tilt hose connection to cylinder leaking

    The leakage happens from the hose connection to cylinder, from both the bigger hose and smaller hose. There is no o-ring in there. The leakage comes from the threading. As I fasten it to far enough, it still leaks. My question is do I need an oring for this connection? I tried to search for it...
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    1991 Force 90hp wiring and timing

    I just got a 1991 Force 90 HP with prestolite ignition. Someone must have messed up the wiring. I find out a wiring diagram online but still confused and a lot questions. 1. For the key switch, B comes from battery positive. C goes to choke. I is overheat buzzer. But what is M? The two M lined...
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    mercury inline 6 bleed hose question

    The motor is 1977 mercury 1150 inline 6 with distributor. It idles in neutral at 1000 rpm and in forward at 650 rpm. I can still feel the uneven breath when in gear at 650 rpm. It still has a hard cold start for about 20 - 30 sec. I think I may find out the reason. The bleed hose at the air...
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    Start working on Force 1991 90hp

    Hey, Guys, Just bought a force 1991 90 hp from a local boat re builder, control, cable & trim included. It comes off from a pontoon-boat, which means fresh water only. He said he test it before and it run flawlessly. I doubt it because the wiring to the key is all wrong, the spark coil is...
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    Why water can intrude through crankshaft lower seal of 77 mercury 1150?

    Hey guys, My #6 spark plug still has a little grey fluid, no as dark as other spark plugs. I checked the history of forum, some said it's normal, some said it's water milky. I installed the new exhaust plate, water jack cover, with every new gaskets and silicone black. But the #6 still a...
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    1977 1150 Exhaust Cover Leaking

    I dealt with one broken bolt for a long time. Finally I managed to tap an enlarged one on the hole. But when I replaced the new gasket and torqued to the specification of 21.5 ft.lb. The exhaust cover leaks a lot from every where. However the engine starts good, runs good, as low as 650 rpm...
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    broken bolt on exhaust side, nightmare

    Well. When I tried to replace the broken rings on one piston, I also changed the upper and lower oil seals. And I also tried to clean the exhaust/water side as the manual suggests. There is only one bolt broken when I tried to dissemble. And that bolt is really stubborn and become a nightmare...
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    1977 1150 Piston Groove Broken

    Things happened on lake, please take reference the following link. https://forums.iboats.com/forum/engine-repair-and-maintenance/mercury-mariner-outboards/10572078-1977-1150-lose-power-when-at-load Today, when I sync and link the carb again, I found out it too rich for idle mix, all 3 1/2, this...
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    1977 1150 lose power when at load

    It happened yesterday on the lake. I drove 9 miles away to the site. Everything works perfect. When I returned, in the half way, the RPM slowly down from WOT to 1800 in 5 sec. Speed down from 30 mph to 7 mph. The fuel tank almost empty. I thought it was because no fuel. So I combine both the...
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    how to install OMC electric priming system on 1977 1150?

    I am trying to install an electric priming system on my 1977 1150 inline 6, as recommended by most guys to erase the cold starting issue forever. I would like to use the choke button and power button for the electric primer, and only for the priming purpose. Anyone has experience on this...
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    Steering wheel hard to turn left than right

    I have checked many things but still no clue. 1. The boat is sitting on trailer, the outboard is 115 hp and sitting upright. The wheel is smooth and can be turned with one finger to turn right and left. But to left, I always have to use a stronger finger than to turn right. 2. On water, this...
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    outboard hard to idle at dock?

    It happened many times, especially when I tried to retrieve the boat at dock. Engine is 1977 1150 inline 6 mercury, boat is a 1977 boston whaler Newport. When in open water area, the engine idles forward and back very good, sometimes a little bit choke, most time no problem. It could only dies...
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    Remote Control and Steering Questions

    I have an old remote control 37580A1/A2, the parts link is http://www.crowleymarine.com/mercury-outboard/parts/2182_50.cfm?q=37580a When running in a wave, the throttle will become slow if I don't keep pushing the handle. I am trying to find the friction adjustment in the control but can not...
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    Questions after new distributor trigger replaced

    It's a 1977 mercury in line 6 cylinder. I replaced a new CDI trigger for the old dead one. It runs good and idle no gear @1000rpm in water tank. Idle in forward gear @600-800rpm in water tank. But after the replacement, when I tried to relink and resync, I found out that I have to reset the...
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    Do I need to replace O-ring for tilt cylinder of 1977 115hp

    Hi, the tilt cylinder doesn't leak much. When I tried tilt up and down a lot, it can drop 5-10 drops in 1 hour. I can tell it from the garage floor. It works very well for the tilt job. And the oil in pump will be empty after 5 month because of the leak, I guess. I mean, in such case, is there...
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    distributor cap problem

    Finally I get to know it is the problem of distributor cap. It is a 1977 Mercury 1150 L6 with distributor. For the problem that happened two months ago, I have changed the switch, trigger, coil and the starter. And I also cleaned the carburetor again which I did 4 months ago. But it still can...
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    1977 115 hp, in line 6 cylinder, stopped suddenly with no hesitation

    The motor is 1977 115 hp, in line 6 cylinder, with distributor. Last week, I tested the motor at home before heading to the bay. Start easily. But at the ramp, the motor is very hard to start. After start the motor, the boat went out of the ramp site and the motor stopped suddenly without any...
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    should the fuel tank be built in the DIY deck or be good ventilated?

    Hello, boaters, I am going to build a rear deck to place my 24 gal plastic tank. I have a dealer deck with live well and middle pole seat. But it doesn't fit the tank. so I have to give up the live well and keep the middle seat. My question is can I build a concealed space for the tank. Or...
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    1977 Mercury 1150, now boat on water, several problems

    After a few adjustment at back yard, I was satisfied with the motor running. This is a rebuilt motor, almost for everything. At back yard, it idles at rpm 900 with flush. Start is hard, even in 80F weather. About 30 seconds cranking, with throttle cable a little bit open. When starting, it roars...
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    cranking voltage check 12 v - 5 v fluctuate

    Today, I was ready for the lake test of my rebuilt 1977 mercury 1150. It was running good a week ago on flush. This week, I cleaned the boat and rewiring the dashboard, routing the cables and wires, and installed the electronics. Before I leaving for lake, I tried to test the motor. It won't...
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