Mercury 80 hp 1983

[Dartboy]

Anyone know the pitch circle diameter of the ring of bolts top of the flywheel. I know it stupid question, but my boat is some 150miles away to measure it.

 

[Ben Konopacky]

Re: Mercury 80 hp 1983

if my mind serves me right i think they are 5/16 x18 its been a long time age.since i bought a puller from merc. its safer/easier.

 

[Dartboy]

Re: Mercury 80 hp 1983

Thanks for that, <br />but its the actual diameter across the ring of bolts from one side of the circle to the other and I forgot to ask, how many bolts are there in the circle.

 

[Dartboy]

Re: Mercury 80 hp 1983

Any ideas where on the Web I could find this out. It will be a few weeks before I can get back to check my motor for the info required.

 

[Hank 911]

Re: Mercury 80 hp 1983

Dartboy I have a 1986 75hp. I took a look and the large circle measures 8" OC 8 bolts. The small circle measures 2" also 8 bolts. I'll look through some old manuals and let you know if I find a clue whether the motors are the same or not.

 

[Hank 911]

Re: Mercury 80 hp 1983

Dartboy I think we have a match. My service manual has the 75 80 and 85 the same in all the photos. There are some good ones in the section on fly wheel removal. Same thing on all procedures and in the specs. Bore, displacement, RPM range etc. In short the numbers I gave you above are correct for your motor. The large circle measures 8" OC, 8 bolts. The small circle measures 2" OC, also 8 bolts.

 

[Dartboy]

Re: Mercury 80 hp 1983

Thanks for the Info Hank.<br /><br /><br />Dartboy

 

[New2merc]

Re: Mercury 80 hp 1983

I have the same motor, I will check for you tonight and post a reply If you want me to. I just removed my flywheel a few weeks ago that was fun. Awsome motor I got mine tweeked pretty good I just have a few minor questions I'm going to post on the forum.<br />Scott

 

[Dartboy]

Re: Mercury 80 hp 1983

If you could Scott as my engine has only one ring of bolts, not two rings as Hank has described.<br /><br />Much appreciated

 

[New2merc]

Re: Mercury 80 hp 1983

I will do It in afternoon tommorrow, I hope thats not to late. So whats the story of you motor? have you used it much? I had great luck with mine so far, just a couple blunders that were caused by me. I can get my boat to about 39 mph with a 17 p prop.