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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Quick update thanks for the support, I took the boat to the lake this weekend and it performed beautifully, no issues with the motor, what a beautiful sound is this old mercs at reving up. Now I'll start working in the boat, paint is very bad, needs new carpets and love overall, I will switch...
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Did that last night, seems to be working. Thanks
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Maybe the timing mark was s this thing that looks broken...
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    Hi. I changed gaskets on the carbs and stopped the leaking, now I started the timing procedure but i couldn't find a timing mark on the block, where is it supposed to be? If there is no timing mark I jeed to find TDC and make a mark to align the mark in the flywheel decal to the block right?
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    thanks, I'm bidding now for a used manual. This weekend I will check compression on the motor, change seals and gaskets on carbs as well, top one is leaking heavily. I will post the compression numbers, hope they are fine I'm right now changing pistons to a Force motor, this Merc is my hope to...
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    Mercury 500 Thunderbolt 50 HP Link and Sync

    What would be a test tank size for this motor, are there any designs available I could use to try to build one, I live 2.5 hours away from the nearest lake so its not an option to go there just to try the motor. Frequently I have to make the trip and come back quickly after a bad trial. I...
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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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