jet problem??

dukey37 · 28 May 2008, 23:23

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?

Mollers · 28 May 2008, 23:34

A blockage over the intake grill could do it, seaweed can also block up a jet a treat.

dukey37 · 30 May 2008, 12:15

hi, we have all that checked!!

codprawn · 30 May 2008, 12:19

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.

dukey37 · 30 May 2008, 20:39

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.

dukey37 · 28 June 2008, 21:46

we still have not our problem sorted?? anyone have any other ideas.. please..

codprawn · 02 July 2008, 22:01

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.

matt h · 02 July 2008, 22:22

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!!

dukey37 · 04 July 2008, 22:08

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