houstonubc
New Member
Hey Guys,
I've currently got my 1998 speedster apart in the garage and i need some advice on the condition of the impellers. I've having a huge problem with what i think is cavitation. I took the boat in to the shop last year, they did over $2000 dollars worth of work and still didn't fix the problem. The replaced both wear rings, the carbon rings, cleaned the carbs, serviced everything, etc. I took the boat to the cottage and the problem was still there. The boat takes over 15 seconds to plane out and if you have more then 2 people it won't plane out at all. Anyways, thanks to this forum, your advice, and the shop manual, I'm going to try and fix the problem myself. I have the pump housing off both engines, and comparing one impeller to the next, I don't see much of a difference. It's the right engine that is giving me problems, which will be the second picture. I really have no idea as to whether or not the damage to either impeller is the cause of the problem. they are both a little dinged up on the leading edge, but nothing serious. The wear rings have a couple scrapes on them, but the clearance is still under .04 on both. I did notice the impeller boot on the right impeller was ripped, but i could have done that when i was trying to take it off. You will also notice a big ding in the fiberglass water intake. Would this be affecting the flow enough to cause these problems?? I'm starting to think it might be a problem with the jet pump ventilating. The engine RPM is screaming high, but there is no thrust untill it planes out. Do you suggest i take the ride shoes off, clean them up and re seal them? What about the through-hull seal?? It's my first time ripping this thing apart. Thanks guys.
I've currently got my 1998 speedster apart in the garage and i need some advice on the condition of the impellers. I've having a huge problem with what i think is cavitation. I took the boat in to the shop last year, they did over $2000 dollars worth of work and still didn't fix the problem. The replaced both wear rings, the carbon rings, cleaned the carbs, serviced everything, etc. I took the boat to the cottage and the problem was still there. The boat takes over 15 seconds to plane out and if you have more then 2 people it won't plane out at all. Anyways, thanks to this forum, your advice, and the shop manual, I'm going to try and fix the problem myself. I have the pump housing off both engines, and comparing one impeller to the next, I don't see much of a difference. It's the right engine that is giving me problems, which will be the second picture. I really have no idea as to whether or not the damage to either impeller is the cause of the problem. they are both a little dinged up on the leading edge, but nothing serious. The wear rings have a couple scrapes on them, but the clearance is still under .04 on both. I did notice the impeller boot on the right impeller was ripped, but i could have done that when i was trying to take it off. You will also notice a big ding in the fiberglass water intake. Would this be affecting the flow enough to cause these problems?? I'm starting to think it might be a problem with the jet pump ventilating. The engine RPM is screaming high, but there is no thrust untill it planes out. Do you suggest i take the ride shoes off, clean them up and re seal them? What about the through-hull seal?? It's my first time ripping this thing apart. Thanks guys.
