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Old 26 September 2007, 18:02   #11
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Originally Posted by Downhilldai View Post
Tis troo thow.

The ones used on the D class boats have a 'medium shaft' ie 18" from saddle to cav plate.
The D class inflatables used to run standard shaft motors - don't know when or why they changed.
Thanks Mate

So you are the second one to say it , must be true then . Ill have to get them to measure it . i haven't a clue where they get the measurement from , long shaft is 20" same as my yam but I cant see any 2 points that that measurement corresponds to .
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Old 26 September 2007, 18:13   #12
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Thanks Mate

So you are the second one to say it , must be true then . Ill have to get them to measure it . i haven't a clue where they get the measurement from , long shaft is 20" same as my yam but I cant see any 2 points that that measurement corresponds to .
Here:-

Shaft length.

This is measured from the antiventilation plate (the flat plate just above the propeller)to the part of the clamp that SITS on the transom-ie the underside of the clamp as in the picture.
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Old 26 September 2007, 18:15   #13
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Originally Posted by ian parkes View Post
So you are the second one to say it , must be true then.
Err - I wouldn't rely on that - there's some fibbers around

These motors seem to be unique to the RNLI at 18". They use a different midsection, which is listed in the Mercury parts book. I expect you could replace that with a standard shaft or longshaft midsection, etc., but that would run up a bit of a bill and the boat may be ok with the 18" - I don't think the old D class had any transom mods when they went from 15" to 18", but I wouldn't swear to that.

What's the transom height on the SIB - 15" or 20"? Most are 15" and run std shaft motors.
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Old 26 September 2007, 18:18   #14
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Nice one NoS - a picture speaks a thousand words...........

That Mariner looks a bit ex-RNLI to me.
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Old 26 September 2007, 18:23   #15
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Here:-

Shaft length.

This is measured from the antiventilation plate (the flat plate just above the propeller)to the part of the clamp that SITS on the transom-ie the underside of the clamp as in the picture.

thats what i thought , my yam is long shaft quoted at 20" in the book but that measurement is about 22".


The futura Mk3 needs a long shaft motor unlike most other sibs .
Nothing is ever simple for me
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Old 26 September 2007, 18:35   #16
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Nice one NoS - a picture speaks a thousand words...........

That Mariner looks a bit ex-RNLI to me.

'snot-it's ex military -hence the odd tube for a separate silencer.

It's actually taken directly from a guide I wrote on Ebay here
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Old 27 September 2007, 03:58   #17
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The later Mariner/Tohatsu engine is indeed fitted with the 18" midsection and the immersion kits are removed prior to sale, if any more come up i'll let you know.
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Old 27 September 2007, 17:33   #18
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The later Mariner/Tohatsu engine is indeed fitted with the 18" midsection and the immersion kits are removed prior to sale, if any more come up i'll let you know.

Thanks but I think a change of plans will be in order . Bill Higham marine has aload of ex RNLI motors coming next week 50 Mariners which are rebadged Tohatsu's . They apparently have an extension piece in the gearcase to turn a short shaft into a long , whether thats how did it or how the RNLI wanted them I don't know .
They wan't 2 grand for a 2005 motor , I was quoted 2150 for a new one at the boatshow .
I wonder if the RNLI actually turn a profit on their used gear, makes you wonder doesn't it .


Anyway have been out for first cruise in the Futura this evening , the yam 25 uses very nearly as much fuel as the DF70 on my rib so fitting a 40 or 50 carbed 2 stroke is out of the question , and apart from that I don't really think the Sib would benefit from the extra power you would only be able to use it in flat calm conditions so for most of the time a bigger motor would be almost ticking over and oiling up.
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Old 28 September 2007, 03:59   #19
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I wonder if the RNLI actually turn a profit on their used gear, makes you wonder doesn't it .
Not sure about the RNLI but I promise Bill Highman will be doing very nicely out of that lot and anyone who buys one.

Pete
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Old 28 September 2007, 04:30   #20
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I'd like to echo Pete7 there - Bill Higham charge extortionate rates for everything! When I was buying a new engine and having it rigged, he wanted about 400 more than other people.
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