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Old 06 March 2016, 11:10   #1
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Mariner 3.3 tell tale

Hi all

Leading on from my small auxiliary engine post. Got the mariner 3.3 fired up in a bucket this weekend. It's the little gearless 2 stroke tohatsu/mercury/mariner engine. Not a lot of water through the tell tale at low revs, plenty at higher revs. Impeller is fine. I remember a few years back the flow was pretty much the same regardless of revs. Cleared the tell tale of crud initially with a piece of wire. Would a weak stream at low revs be acceptable?

Cheers all

Simon
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Old 06 March 2016, 11:18   #2
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When I had similar last year with an old Mariner 4 which otherwise looked great condition I did all the usual revving in a bucket, prodding and checking impellor to little avail. An investigation of the engine cooling passages soon found the problem...
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Old 06 March 2016, 14:16   #3
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Originally Posted by Fenlander View Post
When I had similar last year with an old Mariner 4 which otherwise looked great condition I did all the usual revving in a bucket, prodding and checking impellor to little avail. An investigation of the engine cooling passages soon found the problem...
Hmm.. ok, I am cash poor but time rich at the moment. Maybe a strip down? Any advice on how easy this is? Will I need to buy any new seals or gaskets to reassemble? I fancy having a tinker with this engine. It was the best purchase I think I ever made from a cost/fun angle. I bought it 20 years ago for 90 quid and it was used almost every day for the 15 years I lived afloat on the Thames. We even shifted a houseboat with it once.
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Old 06 March 2016, 14:59   #4
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I don't know how similar the 3.3 is to the 4, I guess the parts diagrams will indicate this. The gaskets for mine were unavailable so I was careful with the old one and refitted with a thin smear of compound on one side.
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Old 06 March 2016, 15:43   #5
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My Mariner 2.3 was identical to yours

Just a dribble at idle but a decent flow at revs. Never caused an issue.
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Old 07 March 2016, 02:53   #6
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Quote:
Originally Posted by simonafloat View Post
Hi all

Leading on from my small auxiliary engine post. Got the mariner 3.3 fired up in a bucket this weekend. It's the little gearless 2 stroke tohatsu/mercury/mariner engine. Not a lot of water through the tell tale at low revs, plenty at higher revs. Impeller is fine. I remember a few years back the flow was pretty much the same regardless of revs. Cleared the tell tale of crud initially with a piece of wire. Would a weak stream at low revs be acceptable?

Cheers all

Simon
Simon how hot does the water get at tick over if just warm should be ok but at 20 years old i would strip as fenlander did cost of gaskets or make your own, at 90 she deserves a bit of TLC what a bargain.
my Suzuki 90 had what i call a progressive tell tale @ 160 hours mechanic said it was ok just for info
cheers
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Old 07 March 2016, 15:20   #7
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Before I start stripping the engine, I read this top tip, not sure if it's worth trying? - Turn the outboard upside down, pump vinegar into the telltale until it comes out the other end, leave it overnight then flush the dissolved crud out, then repeat. Worth a try? Kind of makes sense to me and vinegar is very cheap.
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Old 07 March 2016, 15:29   #8
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There are 2 types of impeller designs on this type of engines( 2,3- 3,5 Tohatsu, Nissan Mariner, Mercury all the same engine). One with the impeller on the shaft and another on the propeller axle. The later has IMHO less powerful tel tale on slow rpms. In front part of the casing of the lower gear there is a chamber collecting very easily mud over time, that is also wort cleaning(now don't remember was this relevant on both models though). The vinegar thing is worth a try also.
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Old 07 March 2016, 15:50   #9
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Originally Posted by C-NUMB View Post
There are 2 types of impeller designs on this type of engines( 2,3- 3,5 Tohatsu, Nissan Mariner, Mercury all the same engine). One with the impeller on the shaft and another on the propeller axle. The later has IMHO less powerful tel tale on slow rpms. In front part of the casing of the lower gear there is a chamber collecting very easily mud over time, that is also wort cleaning(now don't remember was this relevant on both models though). The vinegar thing is worth a try also.
Yes, mines got the impeller on the propeller axle. I'm going to fire her up again this weekend and check the water temperature. Bigger bucket required! The one disadvantage to having a fixed gear... harder to run in a bucket..l
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Old 07 March 2016, 16:46   #10
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Mariner 3.3 tell tale

Quote:
Originally Posted by simonafloat View Post
Yes, mines got the impeller on the propeller axle. I'm going to fire her up again this weekend and check the water temperature. Bigger bucket required! The one disadvantage to having a fixed gear... harder to run in a bucket..l
Pull the split pin and whip off the prop.
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