I am looking to rebuild my carb's on my 1985/1986 Mercury 90HP inline 6.
1) Serial number OA968445 which has always confused me as part list don't usually have letters in front of them (assuming I would fall in the last category below ("8071020 and up)? 90 (6 CYL.) - 5299506 THRU 5594656
90 (6...
I have a 1986 mercury tower or power, 90 hp inline six.
I have it tuned to idle at around 650 rpm's which is just about perfect from what I can tell.
I will sometimes run the boat for part of the day, and sometimes (doesn't always happen) the rpm at idle goes up to about 1200. I am planning on...
I own the following engine:
MERCURY - ( 90 H.P. (1986 ))
Serial No: 0A968445 Model No: 1090726
After some overheating issues last year (which I believe have been solved by rebuilding the carbs and other repairs), I am attempting to install a temp gauge AND a water pressure gauge.
My engine...
I am in the process of fixing up my 90hp 1986 mercury Tower of Power, serial # 0A968445, model 1090726.
I had an issue with a cylinder overheating in the past, but still have good compression. I was running it on 5 out of 6 cylinders, but now after replacing switch packs have spark on all 6...
I have been having problem with my 1986 Mercury Tower of Power, 90hp and have come across a 1990 mercury 90hp for pretty cheap. Does anyone know if I can swap the newer engine for the older one without having to buy new controls etc>
Any help is greatly appreciated.
Re: No Spark on Odd Cylinders, Switch box Help - 90hp inline 6
Thanks Chris,
I attached the diagram to make sure I am disconnecting the correct wires.
The stators wires are the blue/red wires.
The bias wire I am assuming is the white/black wire that connects to...
I own a 1986 Mercury Inline 6, I had an overheat in the #3 cylinder and that cylinder stopped firing. After that the engine ran on 5 cylinders for a while, then dropped another cylinder (I think #1 but dont remember). As I was working on the boat to repair the dropped cylinders (which I thought...
I was driving my boat when day when it my Mercury 90 HP Inline six "tower of power" started smoking, got towed in and took the spark plugs out - found one plug from the #3 cylinder had melted aluminum, a sure sign of an overheat. I still am not sure what caused the overheat and that is what I am...
I had a problem recently with my engine which caused my #3 cylinder to overheat (causing melted aluminum on inside of cylinder and on the sparkplug). I am not getting spark to that cylinder and while I am troubleshooting the cause of overheating (maybe running to lean? Bad water pump?) I am...
Re: Smoke from engine, one badly fouled spark plug, and water leaking from all all pl
I will be down to the boat tomorrow/Wednesday and will take a look and some pictures and report back with compression numbers also. My starboard side of the engine is covered with electronics (all the...
Re: Smoke from engine, one badly fouled spark plug, and water leaking from all all pl
Thanks Chris- is the transfer cover the same as the water jacket cover? I have the entire engine assesable (as I took off all the supporting frames etc to get to the water jacket cover), and the water...
Hi all,
I want to thank you in advance for reading this- this is a great community.
I have a 1986, MERCURY - ( 90 H.P. (1986 )) Serial No: 0A968445 Model No: 1090726
I was driving home the other day when the engine made started smoking so I cut the engine right away. Even after...
I have a 90 hp mercury tower of power, year 1985.
I have been having issues charging and after reading the forums decided to try swapping out the rectifier since it is cheap and the most likely problem.
The new rectifier looks like a standard three terminal (with the metal frame on the back...
