Engine troubles

[kingcod deano]

hey all i have had a bit of a problem with my outboard engine on my boat i have a suzuki dt40 engine when i was out fishing yesterday it was ok down the river on the way out then while i was out at sea the problem started the engine would only do 5knts as soon as i put more revs on the revs where there but it still wouldnt go faster than 5 knts normally it does around 27knts but for some reason now it wont i was wondering if anyone has any ideas what the problem is and how to fix it etc thanks dean

 

[mark]

if the engine revs were still increasing, but you weren't going any faster......

not 100% on the DT40, suspect it might be the prop hub.

been a while since I tinkered with one, but whip the prop off, inside the hub of the prop is a thick rubber bush, the idea being its there to absorb an sudden shocks the prop gets if you clip anything, the rubber can perish and break down so it end up spinning inside the hub of the prop, at low revs the torque is enough for it to keep hold, but as the revs/torque increases it starts to slip

the cure is probably a new prop, there's a couple of places that will recon, balance a fit a new hub bush, will see if I can find a link/address

 

[kingcod deano]

thanks mark thats whats happening the revs are there but it just wont go over 5knts i will take the prop off today and check it out thanks again mate

dean

 

[mark]

spun propellor hubs are pretty common, especially if its getting on a bit, can be repaired though

you can see the rubber bit in the pic of this one

 

[davey g]

hi there yes ad say prop 2 as exactly the same thing happend to me a was going up the river as normal and it was fine but soon as i hit the open and went to set it away it reved like mad but got no where u probably wont be able to tell by turning it by hand as a couldnt a borrowed a one off a mate and put it on at thats exactly what it was..............also a was told but not sure have you changed the angle of your motor onb the tilt and trim if its pointing up wards it doesnt catch enough water to push if you know what i mean hope this helps and good luck.

 

[davey g]

motor

motor

hey all i have had a bit of a problem with my outboard engine on my boat i have a suzuki dt40 engine when i was out fishing yesterday it was ok down the river on the way out then while i was out at sea the problem started the engine would only do 5knts as soon as i put more revs on the revs where there but it still wouldnt go faster than 5 knts normally it does around 27knts but for some reason now it wont i was wondering if anyone has any ideas what the problem is and how to fix it etc thanks dean

hi there did u manage to sort your motor what was the problem if so.

 

[kingcod deano]

i have had a bit of a play with the prop when i span it there was a slight noise so i took off the prop and investagated i couldnt find the hub inside it just the splines the prop slides onto so i put the prop back on and span it again and the noise was gone my mate told me to put the engine in gear {not started} and spin the prop so i did and there was defently resistance so hopefully its all sorted im going to take it down the river to test it i will let you kno how i get on

thanks for all advice

dean