1976 Evinrude 55hp twin trying to run.

[Rollinunknown]

New **
Carb kits
Fuel pump
All hoses
Plugs
Coils
Starter
Wireing

160 psi on both cylinders
Great spark !

Ok spoo it won't run over 3000 . Fuel bulb is hard as a rock ...
Fresh fuel also .

I did not remove the high-speed jet when I rebuilt the carb but I did blow air threw 120psi and seemed like it was clean .


Is there anything I'm missing here before I pay $285.00 to the marina to clean my carbs .....


Click Link for video !!! ?>>> 1976 evinrude - YouTube

 

[oldcatamount]

Re: 1976 Evinrude 55hp twin trying to run.

It sure does look like it's starving for fuel, and the high speed jets is where you should look. To remove the jet, you need a special type of screwdriver so, if you don't have one, don't use a regular screwdriver. The jet is brass and you'll destroy it trying to get it out. A piece of soft, fine wire will work, just be gentle with it. Lot's of carb cleaner, then do it again. You might want to take it easy on the air pressure, although, where the jet is located, high air pressure can't hurt anything. If it's not the jets being clogged up, it's possible the tank may not be venting correctly but, If it were me, I would start by cleaning the jets thoroughly and varify the tank vent is working.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

High speed jets are spotless ...
I removed the cap try see if that was the problem .

The timing arm advances like it should against the rubber stop .

I know it's getting fire cause a 2 cyl won't run under aload if it doseint have spark .

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

These will run on one cylinder and that is what it sounds like it is doing. Check spark under a load with a buddy and a timing light.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

will do gonna head to the lake now . I have a few coils off a 70hp they look like the same part . I don't have a timing like hand but I do have a spark tester that will light up that has the bulb in it .

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

you really need a spark gap tester to show how far the spark jumps. Pull a plug wire and see how it runs with it off. If it runs fine then replace that one and remove the other. Whichever cylinder it keeps running on you know that coil is good.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Ok let's say its loseing spark under aload ... What cause this? The stator or rectifier ?

The outboard only charges the battery to 12.72volts at 3000 rpm .. The battery is 12.60 with the motor off ....

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

Usually it's a bad coil.Check them for cracks or softness. If you find one cylinder isn't pulling it's weight then physically swap the coils and see if the problem follows. If it does then just replace the bad one.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Usually it's a bad coil.Check them for cracks or softness. If you find one cylinder isn't pulling it's weight then physically swap the coils and see if the problem follows. If it does then just replace the bad one.

Thanks alot for your help ill let you know tomarrow I'm gonna spend the day on the lake I got a few parts an a timing light and a spark tester ....

I still might have a chance to take my son fishing this weekend ... Who knows !!!

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Just orderd the OMC factory service manual from 1976 .

I see joe reeves info and it helps alot . But I had to get my hands on one of these

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

Great idea. He is one of the best. I call him Gentleman Joe. He has helped me a ton.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Update ...

I've not been able to touch the boat got called on for a 36hr work day ... Man that was rough !!! I've not had one of those in awhile.

Anyways . I will let you know what happens Monday I plan to take the boat out and adjust everything to factory specs ..

 

[pn]

Re: 1976 Evinrude 55hp twin trying to run.

did u forget the little gasket between the fuel pump and crank case? primer bulb new too? fuel tank vented properly?

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Yeah fuel bub stays rock hard when pumped up . Don't know about that gasket I didint see any gaske it came complete and bolted on.

**** BUT .... After reading this service manual and pulling the lower coil I didint find any cracks but ther is sticker fluid leaking from the lower coil ... So I will replace that and keep on checking it out. Maybe the coil has enough left in it while not under aload but fails to hold a spark enough to ingnite fuel underway ..

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

gooey stuff on the coil is bad. Replace it and I would bet your problem goes away.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Well ... I have a update ...

replaced crack coil .....Coils are firing ! jumps 7/16 gap EASY! blue snap snap snap . Both cylinders .

Well i took it back out today made sure i pumped the bub while it was running ZERO CHANGE!

I check the timing its dead on per factory service manual .

So i noticed the water coming out of the pee hole was hot as crap ive never felt it this hot like i couldn't keep my hand under it . The Cylinder had was hot also couldint keep my hand on it ... Well this motor has never run this hot . So i grounded the temp alarm and buzzer went off on the controls .

So i said screw it so i pull the thermostat threw it in wat didint open till 136* so im going to replace it . Well i said im down this far im gonna pull the cylinder and and when i removed the head i think i found the problem .......



See how the bottom of the top cylinder... Ive done care head gasket jobs and seen the same thing ....
Ive looked at the head&Gasket and i cant see how they are leaking ? Unless wrong torq lbs ...

The bottom cylinder is doing this also ... Could there be water in the fuel ? i mean its brand new fuel i just mixed it a few weeks ago heck i use the same stuff in my 3.3 hp and it runs fine?






You can see the nicks in the cylinder head were the block let go at one time and they just reused the head ...

Again this motor Compression tested @ 160 PSI! ...

You guys think the gasket failed ... I can not find any cracks in the cylinder walls or head..

Man i love working on these 2cyl motors Super easy .. it took about 15mins on a tear down . lol! ordering new parts from iboats tonight ... What do you guys think PLEASE REPLY GUYS!

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

****

Video of the piston moving around ... I never noticed the rings to move around like this ...

124 - YouTube

Again im 100% new to outboards.

again what im thinking is water is entering the top cylinder under a load putting out the spark ... that leaves the bottom cylinder trying to push the boat thats why it wont run over 3k under the load ... but will go over 3k in reverse .

 

[pn]

Re: 1976 Evinrude 55hp twin trying to run.

there should be a gasket between your fuel pump and the crankcase. seafoam treatment.

 

[78 mckee]

Re: 1976 Evinrude 55hp twin trying to run.

Check the exhaust housing cover on the starboard side of the motor. If there is water leaking into the cylinder this is a likely place for that to happen. Or exhaust gases can leak into the water jacket and displace the cooling water (probably around the top cylinder) and cause the motor to heat up. This will also cause the water coming out of the water pump indicator to be very hot. If there is a leak in these gaskets, you will likely find the point of failure upon disassembly. Be careful removing the small bolts holding the cover in place, the bolt holes can corrode and hold the threads tight. Use a ?” ratchet and work them back and forth until the come out smoothly; these bolts are notorious for breaking off on “mature” motors. If you decide to remove the cover and replace the gaskets, be sure to use a gasket sealer. Good luck.

 

[78 mckee]

Re: 1976 Evinrude 55hp twin trying to run.

Oops...port side.