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    Merc 500 Thunderbolt timing marks

    Well, I had been hoping it was something as simple as the distributor being off, but now that y'all have explained about the plate, I guess not. Will still double check the timing this afternoon, and make sure I didn't get something wrong. Thanks for the quick replies!
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    Merc 500 Thunderbolt timing marks

    Pretty sure I already know the answer, but going to ask since the pictures in the manual I downloaded aren't clear enough to verify. On a 1974 500 with thunderbolt ignition (serial 3817126) , when the flywheel mark is on #1 piston TDC, verified piston is at top, should the second flywheel mark...
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    '74 50hp carb kit help

    I've been searching for a while, and am having a hard time figuring out which carb kit is right for my engine. Serial Number 3817126. Looking at several different sites is only adding to my confusion. One shows a Sierra 18-7013 covering all from 1961-'75, another shows a quicksilver 1395-9262-1...
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    '74 merc 500, water in #4 cylinder

    Quite probably a dumb question, but I'm going to ask it anyway... In the picture attached of my exhaust cover, should the area circled in red be an open channel, like mine is, or should most of it be filled in? I found a used cover on Ebay, but most of that part is filled in like mine was when I...
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    '74 merc 500, water in #4 cylinder

    These are the only pictures I could get to upload
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    '74 merc 500, water in #4 cylinder

    Tried searching, but not having much luck. Mercury 500 Thunderbolt, serial 3817126. This boat/engine sat up for several years before I purchased it. Compression is OK (120 range on all cylinders). After new wiring harnesses, and plugs, fired right up. With a new impeller I finally got a chance...
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    Mercontrol assembly

    I bought a 1970 Duracraft, with a '74 Merc 50 on it, that had been sitting for 6 years. Of course the engine and boat wiring harnesses were shot, so I just replaced them and I am having a problem putting the controller back together. I downloaded the service manual, but the pictures in it are...
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    Tilt pump/resevoir gasket or seal? More trouble post #7

    Re: Tilt pump/resevoir gasket or seal? More trouble post #7 Well I got the pump back on the boat and it leaks worse than before... Looks like the resevoir is leaking pretty bad, but that's only the start of other problems I found. In another post I saw Rritt state that the bottom line should...
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    Tilt pump/resevoir gasket or seal? More trouble post #7

    The tilt pump on my Chrysler 135 is leaking and -seems-to be where the pump/resevoir meet. Is there a seal or gasket available to fix this? Everything works great as long as I fill it before a trip to the lake, but I really rather just fix the leak. By the look of the lines it looks like someone...
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    Chrysler carb interchange?

    Do most of the -bigger- Chrysler carbs interchange? Recently got a fair deal on an '84 chrysler 90 hp that I intended to use for spare parts to my 135. The PO bought a boat/motor/trailer just to get the trailer since the boat was scrap. Anyway, suposedly one of the carbs had a problem and was...
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    Chrysler 135 exhaust vs. prop

    OK, new to the forum, sort of new to outboards. I recently bought a 1976 Winner Strike with a '74 Chrysler 135. The engine did not come with an exhaust snout so I bought one on ebay. In the meantime, I took the boat out for a test run and it seemed to do alright, although it was a little...
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