Mercruiser 80 questions..

[thunderroad]

A buddy has a 68 Starcraft with one of these and wants to do a tune-up. He's been unable to find much info so I told him I'd post here. Does this thing have conventional points? If so, would someone have a OEM or aftermarket number for them. Also other basics like plug type and number and gap/timing settings. I'm not finding much info. I do know its a Renault engine. The boat was a one owner and is in excellent shape. The engine ran great last year but he says he notices an occasional hiccup now and then. Fuel is fresh and tank is clean.
thanks

 

[ziggy]

Re: Mercruiser 80 questions..

from service manual #1, tune up specs for mercruiser 80

compression pressure 140 psi
point gap- .019
point dwell- 49*-55*
spark plug type- AC44XL
plug gap- .025"
timing @ idle- 2*ATDC
max rpm @ WOT- 4500-4800
idle RPM-650
fuel required- 93 research octane minimum, DO NOT USE lead-free or no lead fuels
fuel pump pressure- 1.75-3.5 psi
oil pan cap w/filter- 5 qts.

hope this helps......

 

[Haut Medoc]

Re: Mercruiser 80 questions..

Don't know about parts for it, but the specs are in Manual #1-2...
It is a conventional points type ignition,,,,
Point gap .019...
Dwell 49-55*
Plug AC44XL.....025 gap
Timing 2* after tdc....
Hope this helps.....​

 

[thunderroad]

Re: Mercruiser 80 questions..

mucho appreciated....thanks all. Curious, ziggy....DO NOT USE in caps....I'm sure he's just been using regular pump gas. So he needs to use a lead additive? Is this common to this engine specifically or just basically to engines of that vintage?

HM....that avatar cracks me up every time I see it.

 

[ziggy]

Re: Mercruiser 80 questions..

. Curious, ziggy....DO NOT USE in caps....I'm sure he's just been using regular pump gas. So he needs to use a lead additive? Is this common to this engine specifically or just basically to engines of that vintage?

that's just the way it was written in the service manual. in caps.

yep, i just use some lead additivie in premeium unleaded.
and just engines of that vintage......