40hp mercury

[ptl]

hi i have a 1978 40hp mercury outboard motor,when i give it full throttle it just kind of whines and doesnt go any faster then if it is at 3/4 throttle

 

[JB]

Re: 40hp mercury

To Merc troubles.

 

[mcginleyc]

Re: 40hp mercury

Well ptl we need some more info than that. Any descriptions of sounds or anything else would help. It is either a fuel problem, which I would bet on, or a timing problem or something as simple a a prop with too much pitch or marine growth on the bottom of the boat. Post again and add any info on if the boat has been winterized, or stored for an extended period.

 

[ptl]

Re: 40hp mercury

Originally posted by mcginleyc:<br /> Well ptl we need some more info than that. Any descriptions of sounds or anything else would help. It is either a fuel problem, which I would bet on, or a timing problem or something as simple a a prop with too much pitch or marine growth on the bottom of the boat. Post again and add any info on if the boat has been winterized, or stored for an extended period.

 

[ptl]

Re: 40hp mercury

hi at low speed the motor runs and sounds fine but if i give it full throttle it makes a high pitch whine,it sounds like the motor is going faster but not moving the boat any faster,if i back off on the throttle a little it sounds normal.could something be slipping at full throttle?thanks

 

[Dman]

Re: 40hp mercury

Check your prop. Might be a spun hub in the prop if I'm understanding you right. Try a different prop that you know is good. <br />Dman

 

[ptl]

Re: 40hp mercury

Originally posted by Dman:<br /> Check your prop. Might be a spun hub in the prop if I'm understanding you right. Try a different prop that you know is good. <br />Dman

 

[ptl]

Re: 40hp mercury

i'll try that thanks