My Mercury 3 cyl 50hp wont start

[pompeylads]

My Mercury 3 cylinder 50hp outboard wont start for love or money, The starter turns over very slowly even with a jump start from a van. I also have to bupass the solinoid as i dont think that this works as it does not start on the key.

Any help would be much appreciated!!!!

 

[joed]

Re: My Mercury 3 cyl 50hp wont start

I would start by looking why it doesn't start on the key. If the switch is bad perhaps the ignition is OFF or other bad/shorted wiring is killing the ignition.

 

[Mi duckdown]

Re: My Mercury 3 cyl 50hp wont start

I would start by cleaning all the ignition terminals related.
Cracked wires, and so on.

 

[WaterView]

Re: My Mercury 3 cyl 50hp wont start

First... No sparks around gasoline! That is pretty basic DC stuff... if you put your jumper cables on the + on terminal of the starter and the - on a good ground of the starter itself what happens? Does the motor turn over freely by hand if you pull the spark plugs? Pull the starter off the motor put it in a vice what does it do then? Can you start the motor with a rope? oh and did say this before.... No sparks around gasoline! My guess is a twisted starter shaft or hung bendix..

 

[pompeylads]

Re: My Mercury 3 cyl 50hp wont start

Thanks for the replys , we have tryed puttin the jump leads stright to the starter motor and still the same thing , but when we took the spark plugs out the tryed it the starter motor worked fine ( when no comprestion) . i will work my way from the controll box today and see where that gets me ,

thanks

 

[aussieflash]

Re: My Mercury 3 cyl 50hp wont start

Have you had it running before or did you just buy it?Are you getting spark at all.Start with the wiring and make sure kill/lanyard switch is not activated or faulty.

 

[pompeylads]

Re: My Mercury 3 cyl 50hp wont start

We brought it as a non runner , when we got it the chuck on the starter was stuck up (engaded) but we managed to free it off and now the starter is moving freely and moving how it should be .

 

[Maxz695]

Re: My Mercury 3 cyl 50hp wont start

did you check for spark when you rmoved the plugs also check the fuel lines carb see if it,s getting gas check all wiring. Best thing is to have a manual to assist you with this engine you bought. stater and kill switches need to be checked changed if needed but like one post said can you pull start and check for compression to see if it is fist of all a worth fixing. With good compression the engine can most likely be made good with some effort and some $, But start with the heart Compression then fix everything eles

 

[CharlieB]

Re: My Mercury 3 cyl 50hp wont start

Usually a starter that fails under compression but turns seemingly OKI with the plugs out, is a dirty starter. Disassemble, clean the commutator, replace brushes if they are getting short, lube the bushings. Careful with the drive gear, do not lube the shaft with anything much more than a light weight oil like 3-in-one or a spray silicone. Heavier lubes here tend to collect dirt and cause later sticking problems.

Check for 12 volts at the ignition switch, if none, check the fuse near the starter relay. Disconnect the wiring harness at the cannon plug on the motor, clean the pins, if the plug seems to fit loose in the slightest, take an exacto knife and slide it into the slot if each pin to widen it a very small amount.

The ignition switch is a ground-to-kill, if still no spark once cranking at or above the minimum 300 RPM, disconnect the black wire with the thin yellow line at the switchbox on the motor, retest for spark. DO NOT START the motor, you will not be able to kill it without running it out of fuel.

 

[k5blazerboy]

Re: My Mercury 3 cyl 50hp wont start

If the key does not do anything, check th eneutral safety witch within the controller, as that is really the only thing that runs to the solenoid. Thats what my problem was.

 

[pompeylads]

Re: My Mercury 3 cyl 50hp wont start

hi ya, well to update everyone . we took the start off and got it checked and he put some new stuff inside ?? we use him all the time and hes good . anyway we put it back on and still soing the same thing , we have worked out that the solenoid is nackered as we keep having to by pass it and then out ov the blue we turned the key ( about the 100th time) and boom the starter motor was spinning lovley . but as we had been working on her the fuel was not connected . so we stopped conected it all back up and boom stopped again ...... so we are thinking elec problem ? with the pugs out she spinns fine but even with 1 out of the 3 in she wont spinn ? please help

thanks to everyone thats replyed and trying to help