rebuild ?

[windshadow]

I have a 1995 70 hp when the motor was running on my last time out, she just slowly lost power and shut down,after a few min she started back up and I got her home and changed the thermostat,and water impeller good strong water jet run the motor in the tub for about 15 min no proplems went back on the water ran about 100 yards motor shut down again. took her to a marine shop they checked her out in the tub ran fine they took her to the lake put her in ran about 100 yards motor shut down they then said they did a compression test and one of the cylenders had bad compression, now they want 3600.00 to rebuild the power head,I found a shop that will rebuild the carbs and the power head for 1900.00 if I let them do it should I take the vor pump out and mix my own fuel? thanks for any info. and what will I need to take the vro out of the mix?

 

[tashasdaddy]

Re: rebuild ?

1 st you need to check the compression your self. did the remove the head, and inspect, or just do a compression check and assume it needs to be rebuilt. you have the reliable OMS pump, not the VRO pump. i would say a dirty carb, would have caused the problem, more than the OMS pump. your motor has a carb for each cylinder, if one was clogging or clogging, that cylinder was not getting proper lubrication.

i also could be a simple as a head or exhaust gasket being blown.

i would want more answers, before i paid for a rebuild.

 

[windshadow]

Re: rebuild ?

I took the motor to a large boat dealer here in panama city fl,are you saying they should pull the head off to let me know what is wrong? if so what do you think that will cost? not quite sure what you are saying ? let me know

 

[Dhadley]

Re: rebuild ?

If only one cylinder was not getting oil it isn't the fault of the injection system. Your injection system cannot pick on an individual cylinder. Your next step is to determine the damage and find out what caused the damage. Simply throwing new pistons at the motor probably won't work, you'll just damage the new pistons and be back in the same spot.

 

[windshadow]

Re: rebuild ?

ok I think I got it I will take her back to a different shop to find out what caused the problem ,I am not sure of how to find it out my self. I have pulled diesels out of boats instaled new ones pulled injectors and cleand them and so on but I have not worked on out bords.kinds lost here.

 

[tashasdaddy]

Re: rebuild ?

which do you have Johnson or Evinrude. if you are any kind of mechanic, you can do it yourself, with the help from here, and a OEM service manual. personally, i do not see how they can say it needs rebuilding with out pulling the head and exhaust cover.

 

[mikesea]

Re: rebuild ?

i think your problem is fuel ,as already said,need to find out why at a certain time the engine quits,my immediate quess is a total loss of fuel,that eng would run on 2 cylinders,so,is there a fuel restriction in the line,tank,is the tank getting ventilation,if the vent is plugged ,engine cant suck fuel,or you may have dirty gas,check all filters for dirt or water,as the engine shuts down,did you try forcing gas by squeezing the ball,that would help identify the prob .if the engine started running better,if you know your way around a diesal,you can rebuild the eng,the hardest part is getting the powerhead torn down if you have stuck bolts,if you do the work ,excluding the machine work,you can rebuild it for about 800.the right way is boring to first oversize,new piston kits,new bearings and gaskets,that is a very simple eng to rebuild,get a comp.guage and test your cylindes first,i think you simply have a fuel prob,qall rebuild parts can be bought on iboats and there are usually marine machine shops where there is a large boating community.I recommend you use someone who does outboards almost daily,carbs should be rebuilt too,you mght do them now since your fuel ystem may be the problem

 

[Dhadley]

Re: rebuild ?

If the motor lost power and locked up and then freed up as it cooled you'll most likely find #2 cylinder damaged. Several things can contribute to that scenario but until you know exactly what the damage is it's impossible to find the cause. Could be as simple as the wrong plugs. Pull the head and see what the damage is.

 

[windshadow]

Re: rebuild ?

ok I will pull the head and see if I can find out what happend I will post pics as I go along thanks,and thanks for all the feed back on this matter. bill