1976 Evinrude 55hp twin trying to run.

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

i was just reading this as you posted ... im 100% sure now thats were its leaking i seen 2 bolts driping but never thought about water leaking into the head gasket ...

I bet you anything this is my problem!

I sure hope it is .. Think it would let enough water in to kill spark under a load but not have enough running in from pressure under 3000?

And to Pn ... I always use seafoam its always in my fuel for everything to my c2500 to the cheap o weed-eater ...
I normally mix 1oz per gallon.


im going to replace everything . then i know its done right.

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

Any water will kill spark. Doesn't seem to want to burn like gasoline. 78 is right about those bolts wanting to break so take your time. Might even try a little PB Blaster soak first.

 

[78 mckee]

Re: 1976 Evinrude 55hp twin trying to run.

These exhaust cover gaskets were installed at the factory without gasket sealer. Over time they dry out and the thin webs can distort and allow water or exhaust gases to go where they're not supposed to. Gluing them in place with either the Evinrude gasket sealer or aviation sealer (NAPA) will keep that from happening again. Use the same gasket sealer on the bolt threads to prevent seizing in the block. Anyone running an older outboard should consider this repair before it causes problems; can be a real tough one to find if you have not experienced it in the past.

 

[pn]

Re: 1976 Evinrude 55hp twin trying to run.

wow

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

wow

??
If your referring to the foam spacer on the back of the fuel pump ... It's not needed on this pump there's already 3/16 easy of a gap back there for the port to breath.and it didint come with my fuel pump from Iboats it was a brand new pump .


But on the 70hp that fuel pump had to have it .

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Just a heads up ... New exhaust inner and outer gaskets .new head gasket!


So .. The only thing that's not been replaced .... Power pack and stator .. Also has a new rectifier .

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

We assume that there is no change?

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

We assume that there is no change?

Nah .. Still the same ... It has to be the power pack is losing spark power about 2600-3000 rpms or stator .

Ive honestly replaced everything checked the timing like at least 8 times set everything to spec timing advance and all!
Ive never had a motor give me this much trouble before in my life!

Its not fuel related ... The ball stays hard both carbs are getting fuel ive even Ran it up to were it starts falling on its face and shut it down and pulled the bowl drains ... they are full of gas.

I did notice something yesterday .... If i remove the Top Spark plug lead and leave the bottom one on it will idle half way decent ! if i leave the bottom lead off and top one on you have to raise the warm up lever all the way up and still wont run ...

Ive dont the spark test and they both jump 7/16's easy! Im just wondering if the stator or power pack is losing power to the top cylinder or weak spark ..

Im going to replace the stator and power pack both just because theres nothing else to replace for the motor to act up.. Ive checked the carbs about 8 times all high and low jets and bowls are spotless ... plugs get wet (fuel) .

Sofar ...
Fuel Pump Sierra (Complete )
All new Hoses with clamps no ties! Marine Grade
NGK (5111) BP7HS Standard Spark Plug
Coils
Starter Arco
Solenoid Arco
Carb Kits -with floats Sierra
Head gasket OEM
Inner & Outer exhaust gasket OEM
thermostat Sierra
Rectifier ARCO
New power cables & ground straps Lighting Cables 4awg .

Again goth Cylinders are showing 160psi

The only thing i can think of would be Stator/Power/Pack or Reeds ... when i pulled the carbs they looked fine ... but at this point ill buy those brand new also lol ...

I almost gave up today and went to the dealer ... I called them they have a Yamaha f50 for 6700 control's gauges ect...im almost ready to pull the trigger... This motor is killing me guys.

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

You really need to run Champion plugs in this engine.They were designed to run on them. Try this first. Physically swap the coils and do your pulling the spark plug wire test again. It sounds like your top cylinder isn't firing. If you swap the coils see if the problem transfers to the bottom cylinder. If it does you just have a bad coil. Cheaper than powerpack and stator

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

I hear you on the champion plug ill do that for pice of mind .

But I've swapped the coils and its still the same . It's gotta be the power pack ... Unless there's wires fore each cylinder under the stator ... But I believe the power pack is the only thing that regulates cylinder fire? It's crazy.. It has to be the problem . I just don't know how if I do the spark test it jumps 7/16 bright blue spark with a snap how can it fail under aload unless the stator Isint providing the power pack with what it needs to run 100% under a load.

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

when a coil is going bad and it gets warmed up or hot under a load they break down a lot of time. It won't show up at idle a lot of times but after running for a while. If they are new coils I guess you down to the pack. Coils are cheaper than a powerpack. The powerpack sends voltage to the coil for it to amp up and fire the spark plug.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

when a coil is going bad and it gets warmed up or hot under a load they break down a lot of time. It won't show up at idle a lot of times but after running for a while. If they are new coils I guess you down to the pack. Coils are cheaper than a powerpack. The powerpack sends voltage to the coil for it to amp up and fire the spark plug.

....... Urgh .. Well Guys during all this i lost my best friend on the river he was run over by a Tow-boats pushing 15 barges he was a member here Smokenbarrell Dennis ..

So since then ive replaced the STATOR brand new And the POWER Pack II ... Timing @ idle is 4% over 3500 it was at 25%... I have it set at the factory spec 19% over 3500 RPM.

The link and sync is dead on ... Everything is new besides the timer-base .... if the timer base was bad it wouldn't shower the timing like it dose correct ?

Ive replaced everything .

New plugs,coils,starter,stator,power-pack,head gasket,exhaust gasket ,water-pump ,carbs, fuel lines, bulb, tank ,

I don't understand it runs awesome under 2800 rpm i try to go over that and it falls on its face.

Is there something im missing ?

I've given up and i was willing to take it to the local marina for repair but they have a 2-week wait till i can even drop the boat off... We are having a memorial for my friend September 19-22 i have to have my boat running by then since they are still doing a investigation on his.

IM WILLING TO PAY SOMEONE TO FIX THIS AROUND ME LOL! I WILL DRIVE UP TO 300MILES AWAY AND STILL PAY TOP DOLLAR !

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

Very sorry to hear about your friend. Where are you located? I am really out of ideas unless your key in your flywheel is cracked and spins at about 2800 rpms but you would have changed that when you changed the stator. Hitting the choke when it does this has not effect I'm guessing. If you had a timing light someone could put it on a plug wire and when it acted up you could see if you were actually losing spark. Again, sorry for your friend, his family, and friends.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

Well I went to the ramp today check both cylinders with timing light . Both fireing perfict .. I just installed new key when I replaced torqed to 105lbs . Link and sync dead on .

I honestly think its fuel related .
The tube in the middle of the carbs vinturi tube ..? The top cylinder has alot more gas at WOT then the bottom ..

Both carb bowls are full of fuel . I just don't understand it's crazy . It's not spark or timing related ..

At idle its 4' and 19.5 ' under a load.

I'm in St. Louis M.O .

I'm going to drop the carbs again tomarrow something Isint right all throttle plates are perfict as with choke plates .

I have a 1975 Johnson 70hp 3cyl are the carbs the same by chance ?

Like I said this thing idles dead on will start after sitting after 2 days crank crank boom! Just like a new motor .. Just hits 2800 rpms and starts falling on its face .. Like if you were closeing the choke ... If you back the throttle down it will rev back up around 2800.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

i think the high speed orifice jet was blocked off .../corroded up i didint notice this before ... i ran small wire threw it and thought it was spotless but i removed the bowls again and i could see light threw the jet but i could see alot more threw the upper bowl's high speed jet.

i hope this is the problem .... today i noticed the upper carb was getting alot more fuel flowing threw the carb then the lower.

Seems no one has these 0321407 #54D jets but the dealer so i have to order them .. im replacing both of them . by the time i got the lower carb's high speed jet out it was mangled and clean lol! but there was white crud i guess broken down fuel shrinking the jet off to were only 2 little strands small as a fine bristle brush could fit threw.

I soaked the carbs before and blew them out with air and thought i had them clean ... ive had them off at least 8-times maybe 10..

The factory jet was #53D now evinrude says use 54D ..

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

The carbs should be the same. It takes a special tool to get them out without tearing them up. I made one out of an old screwdriver. I think the first post was to make sure they are clean. It's hard to be sure when you think you have them clean but now you know. I'm over in Evansville. You might put the other carb on while you are waiting for your new jet and test it unless your dealer has one in stock. I have a '77 55hp sitting in my shop if you need an engine.

 

[Rollinunknown]

Re: 1976 Evinrude 55hp twin trying to run.

The carbs should be the same. It takes a special tool to get them out without tearing them up. I made one out of an old screwdriver. I think the first post was to make sure they are clean. It's hard to be sure when you think you have them clean but now you know. I'm over in Evansville. You might put the other carb on while you are waiting for your new jet and test it unless your dealer has one in stock. I have a '77 55hp sitting in my shop if you need an engine.

Just a heads up thanks man no joke for all your help .

The dealer is suppose to have it in stock online lol.....I hope anyways .

Dose that 77 have Trim and tilt? im looking for a trim and Tilt setup.

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

No t/t. I did find a used one for a guys 70 online, wiring, relay box, sonsors and all for about 350 total. Just worked out I found the unit in AZ and the wiring and all in OK. Aftermarket is about 850-1000, worth more than the engine. It's always nice when someone comes back after their problem is fixed and let us know. If this works don't be a stranger here. You have amassed more knowledge about your engine now than you cared to know.

 

[fireman57]

Re: 1976 Evinrude 55hp twin trying to run.

Go to dockside chat. Posted the bad news about your friend.