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Old 28 May 2008, 18:23   #1
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Country: Ireland
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jet problem??

hi, looking for some help/advice please? have a yanmar diesel driving a hamilton jet. was out last weekend cruising going well no proplem slowed down to chat to a mate hitting the other way kept engine running moved off after a few minutes and she accelerated to half about 1/3 of her speed then no more engine would rev no problem but she would not move any quicker. checked for blockages etc. any ideas please?
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Old 28 May 2008, 18:34   #2
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A blockage over the intake grill could do it, seaweed can also block up a jet a treat.
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Old 30 May 2008, 07:15   #3
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thanks moller

hi, we have all that checked!!
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Old 30 May 2008, 07:19   #4
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Country: UK - Wales
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Does your system use a clutch or hydraulics? If it's a clutch it could be slipping under load - if it's hydraulic the fluid could be cavitating in the pump.
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Old 30 May 2008, 15:39   #5
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thanks cod

its hydrolics, could you explain what to do and i could give it a go. thanks. its a BH weekend here so it would be great to be able to get out.
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Old 28 June 2008, 16:46   #6
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jet!!!!!!!

we still have not our problem sorted?? anyone have any other ideas.. please..
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Old 02 July 2008, 17:01   #7
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Sorry for the delay - just seen a bloke who works on these - he said it could be a sheared drive to the hydraulic pump. Sometimes the woodruff key gives way and allows the shaft to spin under load giving problems like a slipping clutch. Could also be a rubber spline drive that is slipping.
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Old 02 July 2008, 17:22   #8
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try to turn the impellor from the rear and hopefully the drive shaft will turn at the same speed, if not, there lies your problem!!
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Old 04 July 2008, 17:08   #9
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cheers.....

thanks a lot lads i will check out your tips over the weekend.. i appreciate you both getting back to me.
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