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Old 13 March 2010, 13:50   #1
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Mariner 60hp No tell tale jet

Hi

I was out on my boat in the week and had a strong tell tale jet from both engines, one was stronger but both strong enough not to worry. I took the boat home, went to fresh water run them both and one had no tell tale at all. It was run in a bucket and the vents were all under water.

Does anyone have any idea what could have happened inbetween recovering onto a trailer and getting home? I was told and have service receipt for impeller changes last year, so i dont think its that. But has anyone had an impeller suddenly stop on them? I thought they gradually got worse before becoming unusable.

If all else i will remove the bottom section and replace impeller but wanted to see if anyone had any less drastic solutions first.

Thanks.
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Old 13 March 2010, 16:57   #2
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Happened once to me.
Minor blockage cleared by blowing up through the tell tale tube (one the inside of the cowling).
Tell tale went weaker and weaker.
Not sure what the blockage was.
Fine after that.
Best of luck
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Old 13 March 2010, 18:26   #3
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i have removed the hose from the plastic nozzle inside the cowling but i will try blowing up into it, see if that clears anything. Cheers for the advice.
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Old 13 March 2010, 20:14   #4
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had trouble with mine a month or so back.

Winterised it in October, strted it again in Late November and in January when i started it again it was only only barely trickling. Tried all to clear telltale etc but still the same.I reckon the impeller distorted with all the extremely cold weather we had in December January. Going to get the local marine shop to change the impeller.
let me know what your outcome is
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Old 13 March 2010, 21:22   #5
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Ed, it's got to be quite a long way down into the bucket for the engine to pump water. You'll need at least 4 inches above the split between the gearbox and midsection.

Hopefully you haven't fried the impeller as it's probably been running dry if you haven't had it in this far.
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Old 14 March 2010, 03:47   #6
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Quote:
Originally Posted by ed_dash View Post
i have removed the hose from the plastic nozzle inside the cowling but i will try blowing up into it, see if that clears anything. Cheers for the advice.
A flush muff may well be a better item to use rather than a bucket.
as it forces water up the engine.
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Old 14 March 2010, 05:17   #7
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A flush muff may well be a better item to use rather than a bucket.
as it forces water up the engine.
you won't know if the pumps working properly if you do this
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Old 14 March 2010, 05:28   #8
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you won't know if the pumps working properly if you do this
Well there's something else I have just learned
never knew that and never gave it a thought.
thanks for the info.

respectfully
Robert
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Old 14 March 2010, 07:06   #9
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i have always had the engine in the bucket deep enough so the cavitation plate is under water.

It had a solid water jet via the bucket before my trip to sea, and whilst out it was solid too, and engine was only run for about 10 seconds without the jet. Long enough to know if its pumping water, then when it wasnt,the engine was stopped. So im sure it wasnt run dry for long enough to do any damage. Im pretty sure i was told it took around 30seconds for the impeller to get to the point where it melts and starts to cause damage, it wasnt run for that long.

Still havent tried blowing up the nozzle end but if that doesnt work, it could be the leg. Not a problem, just a pain.
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Old 14 March 2010, 07:59   #10
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A freind of mine had a similar problem after he had run over a sandbank. With the engine stopped I found that by holding a hose pipe over the tell tale so as to squirt some water up it with the engine running then as soon as you took the hose away loads of brown muck and sand came streaming out then it would block again so re apply the hose, had to do this a good few times to fully clear the sand out of the system.

Chris
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