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    Fuel leaking from bottom of air rail, 2003 Nissan 40 TLDI

    Turns out that compression seal is not available anywhere but eBay. Dealers can't find it, and the one online site that is not OOS, boats.net, says 200+ days to fulfill. For what's essentially an o-ring. Managed to get a couple from eBay, hope they come through. I'm gathering info to order...
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    Fuel leaking from bottom of air rail, 2003 Nissan 40 TLDI

    Looks most likely to have been the compression seal on the lowest of the 3 air injectors behind the air rail. It looks slightly deformed, and has a bit of white scale or something on it. Could have been from the lower nipple on the air rail end as well, but that seems less likely. Will...
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    Fuel leaking from bottom of air rail, 2003 Nissan 40 TLDI

    After 20 years of flawless service, the engine wouldn't start today, and there is gas flowing off the bottom of the air rail box when it cranks. I don't see leaks at any hose connections there, but it's dropping off the bottom from somewhere. Bright sun made it hard to get a clear view of it...
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    2003 Nissan NSD40B overheated at hi RPM then idles only

    A belated thanks, Paul. I never followed up on this, but in case this helps someone else, these TLDI motors apparently have a rev-limiter to protect the motor under certain error conditions. There are even 3 limit levels: 6000, 3000, and idle, depending on how over-temp it gets (or other types...
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    Poor draining in Optronics potted LED trailer lights?

    Have been using LED lights on my small boat trailer for a few years now and like how bright and low maintenance they are. Recently the left light went dim, from an underside impact it appears, that knocked out the license plate illumination window and knocked the potted LED puck out of place...
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    2003 Nissan NSD40B overheated at hi RPM then idles only

    Yesterday I was running back to the harbor at high speed with my tiller-operated 2003 NSD40B and 16' inflatable when the alarm sounded and I looked back to see the center light on (may have been flashing) and copious white smoke or probably steam streaming out of the cowling intake at the back...
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    Plywood grade for floorboard for inflatable trailer boat

    The front section of the flooring of my 16' Achilles inflatable rotted out finally. The boat is 36 years old. In looking at the construction of the original piece, it appears to have been 10mm (0.40") 4 or 5 ply plywood, trapezoidal shape (~3' on the long edge by 2' tall), encased in...
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    Mercruiser 165 inline 6 raw water cooling flow

    The raw water cooling flow on my rebuilt Merc 165 was set up a bit differently than the Merc manuals show. Merc has the raw water flowing from the thermostat housing into the forward end of the manifold, back through the manifold, and out through the riser. The rebuilder set this one up so the...
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    Erosion between exhaust ports - what to do?

    Never mind. Got it wrong...
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    Replacing transom hung rudders on Bayliner 3288 - a DIY project?

    Boatyard broke off one rudder - and said nothing - so we want to put in a new transom hung rudder assembly, the whole assembly with mounting plate. This will be a replacement part from the OEM (Marine Hardware). The boat will be hauled, but is this reasonably considered DIY? What sorts of...
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    pencil zinc locations Mercruiser 305 w/Sen-Dure FWC

    Helping a buddy with his '89 Bayliner 3288. It has Mercruiser 305 engines with Sen-Dure cooling reservoirs. I see a zinc on the exchanger but my dim recollection is that there should be others elsewhere on the system. The motors are packed in tight and the hatches are over the shaft logs. I...
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    Dead cylinder in Merc 165 GM 250 I6, what to do?

    Earlier this summer I had the boat out and suffered what seemed at the time to be fuel starvation. Changed the fuel filter and managed to get the boat back to the harbor by manipulating the carb linkage to keep the motor from stalling when shifting into gear. Along the way there was another...
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    Confusion about orientation of Alpha One Gen I bottom seal in upper housing

    I'm swapping an Alpha One Gen I for the chronically water-logged 165 outdrive on my boat. I've got the input shaft swapped and the new water pump installed in the lower. The last thing to do besides mounting upper and lower to the boat is to replace the bottom seal in the upper unit, the one...
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    Is Mercruiser Alpha One Gen I lower rebuild a DIY job?

    Back again for more advice. Bought a used Alpha One Gen I upper/lower in hopes of getting back on the water quickly, It had oil in it so all I did was an external inspection - shafts turned easily, quietly, and smoothly, and it appeared to have been a fresh water unit - a vacuum test, and a...
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    Can water in lower unit be so bad it impedes performance?

    Can water in the lower unit cause the oil to emulsify so badly that it gums up the works? After a few trouble-free trips, a new issue arose yesterday with the old '74 Sportcraft with Merc 165 and L6 250. The boat now can't get much past just on plane, 12-13 kts. At higher throttle settings, the...
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    Who makes quality ignition points?

    Replaced the points in my L6 250 Merc 165 last summer. One of the first trips this year, after 100 hours or so since the tune-up, the motor suddenly died while trolling, and I discovered the point gap was gone. Considering how well it seemed to be running in the hours prior, maybe the plate just...
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    Electric trolling motor size for 16' inflatable

    I want to be able to troll slower for flat water small lake fishing and am considering a transom mount electric trolling motor. I've never used one, don't know anything about them. The boat is a 16' flat bottom inflatable Achilles w/40HP outboard, probably 1000-1200 lbs under way...
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    Need advice: carb specs for replacement Rochester 2bbl on Merc 165

    The boat: 1972 22' Sportcraft deep-V runabout, guessing 3500lbs, with GM 250 I6 and Mercruiser 165 outdrive. Coastal use, northern California. The currently installed 2bbl Rochester carb is in need of servicing, and was probably not quite properly installed when the motor was rebuilt 900hrs...
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    Source for spider washer?

    I spun the nut off my outboard prop and when I put it in reverse, the prop popped off. Luckily I was only in 45' of water with my scuba gear, and got the prop back. The spider washer is history though. This is a Nissan TLDI 40 with a 13 spline shaft. I'm using Turning Point Hustler props and...
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    Longshaft motor slipping on 16' Achilles

    Seems like just crickets here for a long while, but I'll give it a shot. I've got a 1983 SU-16 with a longshaft Nissan TLDI 40HP 2-stroke. Once you get the boat on a plane, the prop ventilates at anything above bare planing speed. The problem seems to be affected by weight and by weight...
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