mariner problems

[foxdodgeman2006]

I have an 86 mariner 150 HP boat ideals fine. But when I take of the motor sputters and then takes off once on plane it runs decent then starts to have a little surge.I have cleaned carbs and installed new fuel pump. Also when on plane at full throttle motor sends a solid beep alarm like its over heating but still have water coming out off the pee hole. Any help would be great

 

[Maxz695]

Re: mariner problems

The engine will still pee with a bad thermostat, a bad gromet where the wtertube goes can restrict flow and still make it pee. Blockages in other areas of the engine can cause the engine to run hot or even overheat even though it,s peeing. The pisser basicly tells you your water pump is or is not pumping water thats about all

 

[foxdodgeman2006]

Re: mariner problems

No thermostats in motor they were removed also as soon as I come off plane the alarm immediatly goes away

 

[Maxz695]

Re: mariner problems

That would be becuse of a surge of cool water to the intake in the LU when coming down and relieving the pressure inside the engine. This could but not nessecarilly mean that there is some blockage somewhere. Have you changed and impellor recently? Has any fins been missing when removing it? Have you had this engine for some time or fairly recently purchaced from someone that may have found this and not corrected the situation?. The thermostat was removed? By who? When? how long scince that was done did this start occuring? we need more info. I,m also thinking the dreaded water intrusion but lets take it one step at a time

 

[foxdodgeman2006]

Re: mariner problems

I have had the motor for about 6 months stats where removed by previous owner didnt know that at time of purchase also impellar is 6 months old I haved pulled the heads and back flushed through the tube from the water pump up through all the water jackets and get good flow. Only thing I havent checked is the poppet valve

 

[Maxz695]

Re: mariner problems

Popit is a good way to start but can I ask why did you back flush the motor would it have been from a poor water flow? When the exhaust plate was removed buy the previous owner I hope he checked for hair line cracks. and sealed as well as properly tourqued the plates. I had a problem with my 40 HP and backflushed everything only to have to remove the power head to find fins from a previous exploded impellor lodged in the exhause base plate, and in the exhaust plate housing which also had a corrode divider plate letting water into my crankcase causing the engine to sneeze at low RMP,s. The alarm sounds like it,s doing it,s job telling you something is amis. Anotherwords for the moment I would set aside a faulty alarm or sensor. Because you say it,s running ruff I would think two things over heat or water intrusion.

 

[foxdodgeman2006]

Re: mariner problems

Back flushed due to the starboard side head being 30 degrees hotter then the port side also the exhsust plate was never removed I dont think because all the bolts look like they still have factory paint that has not been touched

 

[Maxz695]

Re: mariner problems

After flushing the temp was ok on the starboard head? If so I am seeing something moved but where did it move too that is the question

 

[foxdodgeman2006]

Re: mariner problems

The temp is better still about 15 degrees different

 

[Maxz695]

Re: mariner problems

meaning whatever was in there repositioned itself to let a little bit more water to flow but not cleared fully. Just my guess

 

[foxdodgeman2006]

Re: mariner problems

So wats your suggestion

 

[Maxz695]

Re: mariner problems

Heres my suggestion to you. seeing you want to check the popit anyway remove it remove the lower unit as not to let any thing that is stuck in there into the water pum and flush flush re flush the engine trying to see if you can spot debris. I would be the last one to tell you to unbolt the exhaust cover as I know it can warp under heat (Never remove when hot) and it,s a pain in the arse trying to reseal it. If thats nessecary then it must be done. if all eles fails removaal of th e head may be nessecary to get the blockage out. This is the only advise I have to give to you. Hopefully others may have better news after reading these posts for you. I would wait for that advise before attempting my findings and conclusions to your delema. I,m working with back yard machanic knowledge and there are alot of experienced outboard technicians on this site that can lead you in a more positive path to correct this situation Best of luck my friend and May the boating gods help you in the quest for your repairs

 

[aussieflash]

Re: mariner problems

Replace poppet as it sounds like its failing.Put in Tstats again.They are needed to create pressure and hold in cooling water till 145d then open/flush to let in cool water.
Sputtering and surging sounds like Carbs need service.Stuck needle/seat or float heights not to spec.Replace all gaskets also.

 

[foxdodgeman2006]

Re: mariner problems

Thanks for the advise also aussieflash I have soaked carbs over night 3 times and all gaskets are new needle and seats I have not replaced but move freely and have set floats to manual speaks

 

[Maxz695]

Re: mariner problems

1 more thing if you decide to under go my sugestion I would flush up from the water tube and then down from the popit Repeat repeat as whatever found it,s way in might as well find it,s way out. Gotta go for a while grilling clams till open and crab cakes oven baked with a side of fish fried in the pan. Sorry I could not be of more help or better news

 

[floatnisalliwanado]

Re: mariner problems

your sputtering may be a cold engine that never warms up do to no stats,

 

[hl]

Re: mariner problems

your sputtering may be a cold engine that never warms up do to no stats,

I agree with float.... Without stats the cold water may not let the engine warm-up enough. Try putting the stats in and check the poppet valve. Sounds like the carbs are clean and they need no adjusting. Also have th heat sensors checked; I once had a sensor that was faulty.

 

[CharlieB]

Re: mariner problems

Heating at throttle can also be caused by incorrect WOT timing.

Check WOT timing, pull all spark plugs and ground all the plug wires, check WOT Timing while cranking the motor.