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    Mercury Merc 850 Stiff Tight Steering

    Hi there I have a 1976 Merc 850 (85hp) that has developed some very stiff steering. When turning the wheel to the right it seems ok (still a little tight) but when going to the left it gets really hard (to the point it requires both arms and a fair amount of strength). I've taken the bolt out...
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    Merc 850 Port Trim Cylinder leaks

    Hi there Yesterday I trimmed my 1976 Merc 850 up at the boat ramp then noticed the motor slowly let itself back down again after a few minutes. I then noticed the left ram/cylinder was leaking fluid quite rapidly when the motor was all the way down. I was still able to wind the motor up and...
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    Merc 850 Trim doesn't work, just clicks

    Hi there<br /><br />I have a 1976 Merc 850XS and the electric trim died on me yesterday. At first the down button stopped working then worked every few goes then yesterday the whole thing stopped working on me. Now when I press the up button I get a clicking noise but not movement from the...
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    Should thrust washer recess into the prop?

    Hi there<br /><br />I've just purchased a second hand sola s/s prop to replace my solas al prop. On the AL prop the thrust washer recesses slightly into the prop but this new s/s prop i've got it will sit flat against the prop. The s/s prop can be viewed here <br />...
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    Fuel leaking out of carbs when primed hard

    Hi there<br /><br />I just installed a new fuel filter/water separater for my 1976 Merc 850 and to test it wasn't leaking I primed my fuel bulb as hard as it would go. I then noticed fuel dripping from the right side of the cowling. I pulled the cowling off and carb cover and found a heap of...
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    Backpressure created by Navman Fuel Transducer

    Hi there<br />I'm looking at installing a navman fish finder (Fish 4200) with the fuel flow transducer and was reading some specs about it. Its states:<br />Back pressure* generated by the fuel sensor on the feed line: ½ inch/mercury with a 19.8 US gallons/hour (75 litres/hour) consumption, 1...
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    Fuel backpressure a 1976 Merc 850 can handle?

    Hi there<br />I'm looking at installing a navman fish finder with the fuel flow transducer and was reading some specs about it. Its states:<br />Back pressure* generated by the fuel sensor on the feed line: ½ inch/mercury with a 19.8 US gallons/hour (75 litres/hour) consumption, 1 inch/mercury...
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    Switch Box brand, is there any difference?

    hi there<br /><br />I'm about to purchase a new switch box for my merc 850 and I have a couple of options? I can get a sierra for $145 US or a quicksilver mercury one with 12 months warrenty for $170 US. Is there any difference between these apart from the fact one has a warrenty. Have other...
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    Merc 850 No spark on cyc 3, switch box?

    hi there<br />if any has any ideas on how to fix this problem it would be a great help. Motor info:<br />850 Thunderbolt Blue Band Merc Eng No. 4366928. 4 coil electronic ignition NO DISTRIBUTOR<br />This engine is only running on 3 cyc. I've test all the cyc for spark and found no...
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    Merc 850XS spark plugs L76V or L78V

    Hi there<br />I just got a hold of a mercury service manual and it says to use Champion L78V spark plugs with my engine (1976 Merc 850 with NO Distributor). I've been using L76V because the owners manual I recieved when i bought my engine second hand said to use L76V. I looked up the other...
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    Merc 850 Idle Adjustment

    Hi there<br /><br />My 1976 Blueband Merc 850 is currently idling around 1500 rpm and then at 1000 rpm when in gear. I've read that this might be a bit to fast and might be damaging my gearbox. I adjusted the idle screw on the side of the motor and set it back to 1000 rpm when not in gear. I...
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    Blueband Merc 850 Coils

    Hi there<br /><br />My merc 850 with s/n 4366928 seems to lose almost all of its power under load. I suspect it has a bad coil. I've checked everything else and it is either bad leads or bad coil. Can anyone tell me how many coils this motor has and what they are roughly worth new...
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    Merc 850 (85hp) Outboard No Power Under Load

    Hi guys<br /><br />If anyone could help me out with this problem i'd be very grateful. My 1976 Merc 850 Outboard runs good for about 1/2 hour after startup but when its put under any load (such as pulling someone out of the water) it really struggles and seems to lose heaps of power. When not...
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    Info on 1976 Merc 850 Marathon Model

    Hi there<br />I am currently getting my 1976 Mercury 850 (85hp) with S/N 4366928 fully rebuilt and when I went to see it yesterday the guy showed me how there is no S/N on the block and the word "Marathon" is stamped there. He told me that this was a performance motor and that only about 60 of...
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    1976 Merc Changing Fuel from Lead Replacement Petrol to Unlead Petrol

    Since Lead Replacement Petrol (LRP) is being phased out here in Australia in the next year I was wondering if my 1976 Mercury 850 will run ok on unleaded petrol. I have the original manual and it's says it will run on leaded, low-lead and lead-free petrol/gasoline as long as it has a minimum...
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    Fuel Filter on Blueband Merc 850

    Does anyone know how I clean the fuel filter on about 1985 Blueband Merc 850. It's big metal looking thing with a weird top on it. I never dealt with one before so any help would be good. Should I just remove it and place a couple of those small inline filters in. Motor has been spluttering...
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    Merc 850 about 1985 I think (Blueband one) stalls when put in gear

    Hi there<br />I have an old Merc 850 and it stalls every time it is put in gear when in the water. It will run and the prop spins when put in gear out of the water but never in the water. Just had the power pack replace(was expensive) and I don't think this was the problem. Could it be the...
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