Looking for help finding the correct Mercury factory service manual for my dads motor. 2018 Mercury 90hp - 4 stroke tiller. Model #1F904231D - Serial #2B489157.
He called the local dealer but they said they couldn't find the part # listing. He called Mercury in Fond Du Lac and they pointed him...
Update on this 1977 Evinrude 85 85799S.
Issue is still intermittent. Did find something last night. Had the motor running on muffs in the driveway. Seemed to be idling rough. Pulled off spark plug boots one at a time. Issue seems to be with #4 coil. When Pulling off that boot, no change...
New plug wires and new boots for all 4x coils this weekend. Started on muffs in the driveway and idled well for 5 minutes. The real test will come now over the next 6 weeks of running it this year as this problem was/is intermittent. Hoping for the best, but will update if I still have this...
Will give the boots a shot. Coils are original to the motor. Do the boots tend to deteriorate before the wire insulation and cause issues?
I realize these are pushing 50-year old components. If the boots don't solve the issue, I'll look into getting a timing light to try to identify a problem...
Engine = 1977 Evinrude 85HP - 85799S
Intermittent power loss. Seems electrical to me, I have gone through the carburetor and fuel pumps and they are spotless.
Seems to happen more when its cold or humid outside, but doenst always happen under these conditions. Throttle prosition doesnt seem to...
Just had a propeller repair shop fix the 4" of missing skeg on my dads 1977 Evinrude 85hp. Price was $140 which included matching the Evinrude Gold paint I couldn't find anywhere but he had an old can of it in the back. Guy said he leaves the oil in to help keep the seals cool. He also places...
Just went through the same thing myself. Bought a few sets of orings to replace on multiple leaking tanks.
Your valve retainer, brass washer on the bottom photo, looks distorted like a funnel or cone. This washer is staked in place, and the aluminum needs to be moved with a punch prior to...
I read on here about a similar issues to what you suggest when I was trying to rebuild my 1977 85hp Evinrude T&T, looks similar to yours but mine has the different "prestolite" pump.
If replacing your seals doesnt help, give this thread a read...
Trim Cylinder. Does anyone have any experience with these old style tilt/trim units, the ones with the cylinders outside of the mounting bracket? Or have any idea the purpose of this push-on ring in the trim cylinder (Part #36)?
Seems what I have here is the last year of this style T&T unit (at...
1977 Evinrude 85 - 85799S
Leaking out of top wiper. Replaced all orings with OMC Oring Kit #0174520.
Bobbin wire for trim gauge was a nest of unwound wire. Removed wire, sending unit spring/bb & copper ground contacts (attached photo).
Put it back together and filled/bled system. Seems to...
