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  1. S

    Tohatsu/Merc 30hp EFI water pressure/overhear issues - at a loss, S/N 0R341278

    Hoping someone can help. Since this 2010 Mercury is really a Tohatsu, I'll try this forum instead of Merc (tried it there but got no hits). Issue: Running boat in water causes water pressure from tell tale to drop off and become weak. Motor will eventually heat up. Had one overheat alarm (the...
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    Clogged water jacket? Merc 30hp EFI, no flow at higher RPMs on plane only?

    I'm am lost with this engine, as I feel like I am chasing so many weird problems. This is a new problem this season though. First time out, got a high temp alarm and my son (who was using boat) realized there was no water coming out of tell tale when going fast (he was on plane). He let the...
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    Fuel line check valve

    I have a 1989 Viking 35 sportfish. I've been dealing with a generator fuel starvation/priming issue since I got the boat 3 years ago. I solved a variety of problems with the genset and when I can keep the fuel flowing it runs and performs great, but given how hard it's been to prime the fuel...
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    2010 Merc 30hp EFI 4S occasional stall when returning to neutral or low rpms

    I'm really starting to pull my hair out trying to figure out why my 2010 30hp EFI keeps stalling when returning to idle. Not always, more often than not it is ok, but it stalls enough that running in a river with strong tidal currents, I'm losing faith in the motor and letting my kids use the...
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    Trying to solve low rpm stall, surging, 2010 Mercury 30hp EFI 4stroke

    Hoping someone with more knowledge of 4stroke outboards can help me out. I'm new to 4S having had 2 strokes to date. I've been chasing a fuel issue, or I think fuel issue, in a new to me 2010 Merc 30hp EFI 4 stroke I bought a couple of weeks ago. It did stall once when we first got it when...
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    Mercury F30ELPT EFU, serial number comes up as 2006, tag says 2010

    Hi All, Just bought a boat/engine package used to replace a smaller tiller style dinghy setup we have. The engine is a Mercury 3hp 4 stroke EFI. Very nice engine. It is the original engine that was on the boat when sold to the previous owner new in 2010 as a leftover. I have the Certificate of...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Thanks. I saw a different reply via email from you, so to answer those questions - these are all mercury OEM gaskets that seem to block the port a bit if you let the gasket just sit on the studs. And I am using the Mercury service manual, and sure as the sun come sup, compression numbers are...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Checked out the bleed lines and check valves. The one in the lower crankcase is definitely good. Only allows flow out of case, not in. The check valve in the reed block also seems ok, but maybe not perfect. It seems to let a little air through back into the reed block, but not always. Not enough...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Thank you for replying. That hose going off to the right is just where it's sitting while disconnected from the bottom of the carb. It normally connects there. I will check the check valves. As for the hose being a different size, I just looked closely and it sure does seem larger. If it was...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Here's an update with some progress I believe, at least when it comes to diagnosing and ruling things out. First, I did a cold leakdown test. I've read that it should be done warm, but, well, I can't keep the darn thing running. Worst case my readings would look worse than they really may be...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    The needles were identical. I thought they were different. When new, the needle tip was gray not black. Probably coated in something. I compared them side by side but here's a pic. And yes, I double checked the float height after putting the new needle in. Thanks for noticing the water...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Made some progress. Another new set of plugs, but this time running it in a bucket of water, and not on a hose. I was able to turn it and the backfiring stopped as did the stalling. The first time I adjusted the mix screw, I landed at 2.25 turns out. I did it again a few hours later, and landed...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Here's another question...What is this brass screw circled in red, that looks like a jet, on the top right of the carb? The parts diagram doesn't show this, at least that I see. I don't recall, without pulling the carb, if it is a passageway or not. Assume it is.
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Does anyone know if item 41 in this parts diagram should be on my engine? I see it in the service manual, for my SN and year, and just found it in the parts diagrams online under "carb linkage" section. It is not installed in my engine. It shows it between two carb gaskets and the reed...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    Quick update. New parts came today. The carb bowl is much better. That hole/circuit we've been discussing is easy to blow are through on the new bowl, so I'm sure that was causing me grief with the old bowl since it was clogged. Then I noticed my old needle was a bit deformed at the end, like it...
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    Merc 15 hp is getting the best of me, I'm at a loss, won't run right (S/N 0T533347)

    First, thanks to everyone that has helped me so far, as I've posted a couple of times as I worked my way through trying to get a 2002 Mercury 15hp short shaft 2 stoke outboard to run right. It still won't though. It seems to load up (rich) and then cough a big puff out of the exhaust, then drop...
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    Confused about the proper coil, part number and actual part don't match

    This is for a Mercury 15hp 2 stroke, serial number 0T533347 I am still chasing down what I think is some sort of electrical or fuel issue. Working through it, but did discover that the kill switch at the end of the handle is bad. Reads 120-200 ohms and activates without pushing the button if...
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    2002 Mercury 15hp, SN 0T533347, question on water discharge after rebuild

    Hi All, wondering if I can get confirmation on how the water is coming out of my outboard. I have done a ton of work to this little motor over the winter, including a full rebuild of the gear case and refinishing it to fix some electrolysis caused by an anode that was lost at some point along...
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    Water tube pickup seal installation, Merc 15hp 2 stroke S/N 0T533347

    Does anyone know the proper way to install the little black rubber seal, part number 33613, in the lower gear case on a 2002 Merc 15hp outboard? I'm getting my lower unit all back together after the debacle with rethreading the bearing carrier threads in the gear case, and I'm not sure I have...
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    How to retap gear case bearing carrier threads, Merc 15hp 2 stroke S/N 0T533347

    Now on to the next decision, are the threads metric and 1.5 pitch, or american/standard and 16 threads per inch. I believe 16tpi. Here's a close up of another bearing's threads matched up against both the american size and metric size dies. The 16tpi seems just a tad more in alignment, and the...
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