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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)

    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

    I'm pretty sure the bearing carrier was never out on my 2002 2 stroke 15hp Mercury o/b. The carrier is finally out, but it looks like it left some of it's thread behind in the gearcase, likely due to either fatigue, the hear, corrosion, or all 3. Anyway the case is in good shape and there's a...
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    Oil high in ZDDP for Crusaders with flat tappet cams

    Well my head is officially spinning trying to sort out modern engine oils for use in 1989 Crusader 454s. My understanding is these engines have flat tappet cams vs rollers, and require higher zinc/phosphorus (ZDDP) levels than current energy efficient oils provide. Without it, the engines will...
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    Merc 15hp carb cleaning circuit question - is this a dead end or just plugged?

    I have a 2002 Merc 15hp 2 stroke. Serial Number 0T533347, Model 1015201ZD It wasn't idling well, so I pulled the carb, disassembled and cleaned it very well. All came out great. All circuits are clear and all varnish gone. There is one circuit though, that I'm just not sure of. In the carb...
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