Mariner Magnum 40

[xBASSASSINx]

So yesterday I got a boat and it came with a 40 hp magnum on it,1989 model.well here is the weird thing yesterday it fired up every time he turned the key but today i get out there and cant get it to crank at all no matter what i do.My starter is spinning the fly wheel so im figuring maybe fuel problems bad gas,bad lines,etc..But also my water pressure at the house is average at best.Do you think maybe that has anything to do with it not wanting to idle?Not too sure

 

[Maxz695]

Re: Mariner Magnum 40

A bad idol is a sign of a bad stator from what I gather but i,km NO PRO from post I have read this is common. I actually have a atator for a 40 HP 4 cylinder 4 stroke for sale message me if interested it,s in great shape I,ve tested it and it comes with the flywheel for 1997 40 HP 4 cyl 4 stroke. hope this helps I can,t give a price on the forum message me for that CHEAP!

 

[xBASSASSINx]

Re: Mariner Magnum 40

the problem is it wont idle.... it gets right to the point where it should and cuts out

 

[Maxz695]

Re: Mariner Magnum 40

Part number 398-832075A3, Also Replaces A4, A5, A6, A12, A17 and A21 Also a CDI but not sure which one

 

[donzi gt230]

Re: Mariner Magnum 40

Confused.....it won't crank or won't idle?

 

[xBASSASSINx]

Re: Mariner Magnum 40

Oh it wont crank it gets right to the point where it wants to but stalls out.Also I'll be putting fresh fuel and oil.Another question I have is the resevoir for the mixing oil.Is there a way to drain that i looked but it got dark on me? Instead of putting the new oil in the resevoir , can I just do the 1 pint per 6 gallons in the tank and not even mess with that?Or would I have to take extra steps to acheive that result?Its got brand new spark plugs in it so im thinking its a fuel problem but it could be something like that im not a pro i just know enough to get me home

 

[aussieflash]

Re: Mariner Magnum 40

If it won't crank,it can't stall.Motor needs to be running to stall.lol I'm confused as to what you mean.However I'm guessing your cranking engine and it won't ignite (start).if your new to this boat, check proper starting procedure,you will be surprised as to how many people neglect this with new boat(me included).

 

[Maxz695]

Re: Mariner Magnum 40

You would have to disconect the oil line to the pump to run on premix and then you would have to RE Bleed the lines from the tank to the pump and possibly to the engine, pull the plugs and see if it looks like theres water on them. I have mayny parts like coils oil injection pump stator flywheel trim tilt relay package etc, but we want to find out whats going on here. Start with a compression checkThis is always first suggetion then move on to spark from coils see if 1 is firing 2 or all etc. Then move on to fuel. flodding no gas etc.question : do you have a single or double throttle IE one for the gas and one for the shifter. or just one throttle handle for both?

 

[donzi gt230]

Re: Mariner Magnum 40

Ok, you're just using the wrong term. Cranking is what the starter does when it's spinning the motor, past that is running/idling. Since it started for him and almost starts for you, I'm guessing it's just something you're doing and not old fuel or anything else. Either the position of the throttle or the choke. I think you probably have the 'push key' choke, but whatever the system is, make sure you're activating it. Second is throttle position, you generally want a little bit of throttle advance on it while cranking and you can try moving it up & down while cranking 'till you find the spot. If you are able to, call the seller and ask him what his technique was. There's also a chance that it's got issues and he warmed it up before you got there so it started then and not now. If nothing else works you could try a small shot of starting fluid to see if that'll get it to go, it may just be flooded or fouled up from all the attempts to start it.

 

[Maxz695]

Re: Mariner Magnum 40

sounds like a fuel problem but then it,s trickey it could be electrical I always try to rule out the least expensive cure until nothing eles works. take out the plugs and inpect them see if there dry or wet do they smell like water or gas?Without the plugs turn the engine to make sure the engine runs freely also blowing out any residue or fuel buildup causing a flooded engine. I,m not firmiliar with the magnum, but i,m fairly well educated on both the 2 stroke and 4 stroke 40 HP engines. After replacing the plugs pump bulb until it gets hard. If it does not get hard your needle valve is not sealing, and the carb must be rebuilt. If the engine starts, and then dies there is more than likely a lack of fuel. This can be caused by 1 bad gas 2 bad fuel filter 3 bad bulb 4 bad fuel lines allowing air and crud to get in to the system 5 bad check vavles in the fuel pump 6 poor or bad fuel pump 7 clogged screen before the carb 8 tank pick up clogged . Thats just the fuel system if after all these remidies do not help move to electrical malfunction. In taking these steps it will not only firmiliarise you with your engine, but also it will help you with yearly maintanance that is required from you as an owner of this engine. Trust me this will NOT Be waisted time

 

[xBASSASSINx]

Re: Mariner Magnum 40

yeah i was thinkin i may have flooded it earlier in the day.What i was doing later in the day was pumpin the ball on the gas tank til firm, then i would turn key to run let sit for a sec push choke in and try to start and give the throttle a couple bumps but I noticed once you bump the throttle too far it just quits,and thats basically the way he showed me. But where can i find the proper procedure,I have looked for a pdf file online for a manual but no luck.If i have time tommorow ill check the plugs to see if fouling is the issue.

 

[donzi gt230]

Re: Mariner Magnum 40

I doubt that there's a specific written rule on exactly how much to throttle it. You may just have to get it 'cleared out' and start over. Pull plugs and all that or just a squirt of quick start, whatever you're happier with to get it to start and burn away any build-up. It could also be that your starter or battery or something in that path are weak. When the engine starts to fire and disengages the starter prematurely it's often an indication of a problem in the starting circuit.

 

[aussieflash]

Re: Mariner Magnum 40

1.Open vent on tank 2.prime bulb till firm.3. open throttle (out of gear).4.Turn key to on and push in choke (you should hear click at engine...valve open) hold in around 5 seconds then start.If you have weak water pressure fill bin with water.

 

[Maxz695]

Re: Mariner Magnum 40

The basic rule (AND I,M UP WHEM MY OL LADY WANTS ME IN BED)Is to Totaly GUN the Throttle WOT until all gasses have been burnt with choke then without, after fire stop engine and restart at Normal operating adjustments including but not limited to opening the carburetor air mixture screw 1 1/2 trurns from a light seat all the way in and then after start adjust according ly leaning it out. I,ll see you allin the AM Peace!!! Max

 

[narvlebenoit]

Re: Mariner Magnum 40

starting fluid is a no no use mixed gas in a spray bottle and spray in the carbs.

 

[CharlieB]

Re: Mariner Magnum 40

Is the LANYARD plugged in?

 

[Maxz695]

Re: Mariner Magnum 40

if it was the lanyard saftey swtch he would get NO FIRE he is apperently geting spark but not enough fuel to keep it running

 

[donzi gt230]

Re: Mariner Magnum 40

Starting fluid is somewhat a no-no, but if it's flooded it's also well lubed; the ether will help it fire even when somewhat flooded. As for clearing it with the throttle wide open; that may work, but only with the choke off. Spaying mixed gas in would be the right way to fire one that's not getting fuel for sure, ether on a dry 2 stroke is not good. As odd as this'll sound, stubborn engines will sometimes fire more easily using a rope start.

 

[xBASSASSINx]

Re: Mariner Magnum 40

i dont even the think the lanyard even works i can get it to fire with it pulled im tellin you this guy before wired this thing and its a mess.Like the bilge and aerator and all that i know ill have to rewire and ill put in line fuses in the wiring instead how they got it at the switch.im going to get out there and try to get this beast to crank.Thanks for all the help guys i'll give yall a report later on and take pictures if i find something odd

 

[Maxz695]

Re: Mariner Magnum 40

after reading another post they stat that if the engine trys to fire and then dies the fuel pump is shot