'86 120 I/O Belt problems

[jimhen]

I have a 1986 Mercury 120 I/O.
I have replaced my belt every year and find that I need to adjust the tension almost every time I go out. I have set the deflection to abt 1/2". Is this right? I have also replaced the alternator pully, this helped some. I have been told that there is a revised alternator bracket available. Does anyone know what I should look for?

 

[Haut Medoc]

Re: '86 120 I/O Belt problems

Welcome to iboats......
Don't know of a different bracket, but that does not mean it doesn't exist......
Is the crank pulley free of rust?.......​

 

[jimhen]

Re: '86 120 I/O Belt problems

yes it is clean

 

[jimhen]

Re: '86 120 I/O Belt problems

anyone else have an idea on this? I have heard that boats generate an extreme range of RPM's over a short time frame and that can lead to vibration, hence the alleged upgraded alternator bracket.

 

[Don S]

Re: '86 120 I/O Belt problems

http://www.boatfix.com/merc/Bullet/87/87_01.pdf

 

[jimhen]

Re: '86 120 I/O Belt problems

thanks.... this forum is great!