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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Thanks marc850! those images look much more like my outboard I will check later tonight. What is the manual you are taking this scans from? I might want to look to see if there is one available to buy it, looks very good.
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Hi racerone, I will take some pictures later today how ever I believe the cowling cover that wraps around the motor is not original.
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Thank you merc850 this is much clearer than the SELOC, which is the Idle stop screw? I think I have identified all others.
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Hello, I have an old 1976 Merc 500 thunderbolt 50 HP outboard, I want to check and adjust the throttle link and timing synchronization, I got the SELOC manual and it is not very good, the pictures in the book are all black and cant see well the items, I don't seem to find the right model of my...
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    Milky fuel in carb intake force 85hp

    ebay pistons ordered yesterday hope they are good. Once I got them, can a compression test be done without installing the block and head to the motor leg etc? I was thinking installing the pistons, head gasket, cylinder head. And the flywheel without stator/trigger to crank it, also the starter...
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    Milky fuel in carb intake force 85hp

    oh one more thing, the ones I found in ebay are for another 1989 85HP outboard,,, mine should be F691015 and this ones are F372015-3, this ones according to this chart bore size are 0.001" bigger so I assume this pistons may be a little bit bigger, 0.001" seems nothing with the wear I measured...
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    Milky fuel in carb intake force 85hp

    will do that, thanks!
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    Milky fuel in carb intake force 85hp

    Understand, so I will assume that my rings are mislabeled then if I get real 39-817869A they should fit to my bores?
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    Milky fuel in carb intake force 85hp

    Thanks Force Power, I have 2 books the Seloc and the Service manual. Seloc says both TOP and LWR Ring End GAP is 0.006-0.016. Service manual shows, TOP Ring 0.010"/0.020", LWR 0.006-0.016". I think my rings are to big to filed down to that GAP, do you think they were mislabeled, both? I'm...
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    Milky fuel in carb intake force 85hp

    Yes part numbers of my rings are 39-817869A as supposed to be but dont fit. The are completely overlap. Thanks for checking.
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    Milky fuel in carb intake force 85hp

    There's in ebay 3 used pistons... one bad (see link below), according to the listing they are 83.85 mm, my bores are 84.201 mm, would they work assuming the pistons are in good condition? What is the gap between bores and cylinders recommended? This pistons are P/N F372015-3, and what marine...
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    Milky fuel in carb intake force 85hp

    Thank you for the chart, it seems the part number of the rings I have are the right ones, but they don't fit, the ends overlap completely by a some milimeters I don't think filing them will help, it is a lot of overlap. Maybe they were mislabeled? although as you see in the pictures I have 2...
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    Milky fuel in carb intake force 85hp

    I read also about that method of disassembling through the intake manifold, but I decided to go the full way and now the motor is completely open. Found out all three pistons are broken, with broken rings, the scoring in the cylinders don't seem to be very deep, I'm have already honed the...
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    Milky fuel in carb intake force 85hp

    So I just took the head off and found a mess inside, piston#1 looks melted cylinder walls with a small scratch, piston#2 carbonized but no melt the cylinder walls have rougher scratches, piston#3 a lot of carbon no melt and no scratches in the cylinder how ever this one was dry and the other 2...
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    Milky fuel in carb intake force 85hp

    thank you!
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    1989 85HP Fuel Pump

    Thanks Jerry, I will leave it as it is just was wondering that if in any case I needed to change the complete pump, I could just buy the one with out the spring or have to buy the exact same one. By searching on ebay it seemed there were much more offers on the one without the spring...
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    Milky fuel in carb intake force 85hp

    Thanks I'll do that, I believe I read in other thread there is no Torque or torque sequence for the cylinder head bolts right? I should just try to torque it firmly in a cross pathern or something like that? Would using some liquid gasket maker be good? or could damage anything?
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    Milky fuel in carb intake force 85hp

    Hello I finally did compresion and spark test, sparks look good and strong at 3/8 gap, compression on the other hand is bad, 100, 60 and 110 from top to bottom cylinder, what should I look for now, head gasket? I dont think I'm prepared to bore cylinders change rings and all that stuff right...
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    1989 85HP Fuel Pump

    Hi I have a 1989 85HP outboard, I replaced the diaphragm but I noticed when buying for spares that my pump has booster spring and booster spring retainer, that matches the pump for the L-Drive version of this motor, but my motor is not L-Drive to my knowledge. My question here is what is the...
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    Milky fuel in carb intake force 85hp

    I'll test the spark and compression test, is there any device or something that I can do to crank the motor with out having to turn the key? I usually do all this tests and repairs by my self, so it would be good, to have something to remote crank it, I used to jump a wire in the starter...
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