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    How to clean the non-skid deck? Stains and don't-know-what spills?

    Just trying to clean up a 1977 boston whaler 17 ft. The last owner has a lot spills over the back deck. And a lot stains here and there. The whole floor is covered with diamond shaped non-skid gelcoat. Some people say if the floor is ok, don't bother re-coating it. There must be a good way to...
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    1977 power tilt hose connection to cylinder leaking

    Maybe it's not a bleed hole or I didn't explain it clearly. Here is the pic for the button, which I refereed to. I use a screw and jb weld to block it.
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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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    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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    Why water can intrude through crankshaft lower seal of 77 mercury 1150?

    Update: The exhaust cover is opened up AGAIN. 1. Looking at the gasket, it seems easy to find the leaking part. It's the top corner port between Cylinder water jacket and the exhaust side. And it's the only leakage by looking at the baffle gasket. Part of that area peer off easily with bare...
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    Why water can intrude through crankshaft lower seal of 77 mercury 1150?

    After changing the lower crankshaft seal, lower powerhead gasket, and also replacing a defective check valve. Here is the what looks like for the spark plugs after running 15 minutes. Seems still milky oily on the sparks #5 and #6. #1-#4 all good. The motor idles good, the check valve works...
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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?

    Today, I run the motor with water muff for 30 minutes. Here are the pictures before the run. The 6 cylinders all have corrosion after the 2-3 months sitting. The #6 looks better because the piston reaches the top.
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    Why water can intrude through crankshaft lower seal of 77 mercury 1150?

    Thanks guys, you are awesome. I did the crankshaft seal twice before. First push a new oil seal in with the old 2 seals. The second time with 2 brand new seals only, but didn't deal with the grooves. I did the exhaust very very carefully. 3 Times repeat doing that, and finally using a almost...
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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

    Ok, here is the pictures of #2 Piston and Cylinder. #1, 122 #2, 115 #3, 130 #4, 122 #5, 125 #6, 130
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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

    I don't quite get it. So the orifice at point 2 keeps the bowl at atmosphere pressure. There is a link between 1 and 2. Why there is a link? What's the purpose of it? Where does 1 go to? I saw some 3 small holes inside the choke valve, which I believe belong to the idle holes. There are 2 small...
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    how to install OMC electric priming system on 1977 1150?

    Thanks, racerone. I am still a little confused about the 1. nipples that you install on carburetor throat or 2.bypass covers Are those as pointed in the following pic? And one more question, the wee hose is installed to the first carburetor or all the three carburetors?
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    how to install OMC electric priming system on 1977 1150?

    1. Is this the item I should use as the OMC Fuel Primer Choke Solenoid? 2. For the installation, 1) the in-let connection will come from the split from the section between the fuel pump and carburetor reservoir cup. 2) the out-let connection will go to the carburetor section as I marked in the...
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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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