1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

[dicarlo]

I just finally finished my rebuild on my 1980 Evinrude 100HP Crossflow. New pistons, rings, rods, seals, thermostats...the whole 9 yards. I got everything wired up tonight and went for the first turn over. She started right up after 3 cranks and was running great for a few minutes. I turned it off and was checking to make sure there were no leaks. Fired her up again she ran and then idled fast and died. Wouldnt start after that. I pulled the plugs and the #3 plug looked much more dry than the others. It was also showing some smoke coming out of that cylinder as the others were not.


Any idea what might be going on here? The smoke concerned me so I dont want to try to run it just yet again...Any advice you can get me would be great!

Thanks,

Mike

 

[Joe Reeves]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

Hopefully you rebuilt the carburetors.... also make sure the high speed jets (4 of them) which are located in the bottom center portion of the float chambers should be double checked to make sure they are (for sure) absolutely **** and span clean.

The idling fast on the secong startup may indicate that the carburetors were running lean, then out of fuel.

Be sure to check the compression and spark on general principles (starting point of trouble shooting).

 

[boobie]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

What happens if you pump the primer bulb ?? As Joe said it sounds like it's running out of fuel.

 

[dicarlo]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

Going to check a few things today. Also going to recheck carbs. But the bulb was still hard when it stalled. Also what about timing?

 

[Joe Reeves]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

When you prime the fuel... pumping the fuel primer bulb, that bulb becomes rock hard, but as the engine runs the fuel level within the primer bulb drops to the halfway mark of the bulb taking into consideration that the bulb is laying in a normal horizontal position.

If the fuel primer bulb is indeed laying in a normal horizontal position, and is still rock hard as when you primed it, fuel is not flowing thru it to the engine.

 

[dicarlo]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

Thanks for all the advice guys. Here is what I found:
Yes, Carbs have been rebuilt and are good. The key on the fly wheel broke and timing is off because of it. The fly wheel was torqued to spec so not sure why this happened. Is there anything I should check before throwing a new key in there and giving it a second go?

I rechecked all lines and everything that was suggested. I am assuming this was my main problem.


Mike

 

[Joe Reeves]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

Take the time to check and clean the flywheel and crankshaft tapers. Remove the timer base if needed to do this work properly. The slightest bump on those tapers will prevent the flywheel nut from being torqued down properly.

The nut torque specification is 105 foot pounds.

The flywheel key must be the specific key, part number 307480. You cannot use some look alike key purchased in a hardware store!

The straight edge of the key must be vertical with the engine, straight up and down... NOT aligned with the crankshaft taper!

 

[dicarlo]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

Take the time to check and clean the flywheel and crankshaft tapers. Remove the timer base if needed to do this work properly. The slightest bump on those tapers will prevent the flywheel nut from being torqued down properly.

The nut torque specification is 105 foot pounds.

The flywheel key must be the specific key, part number 307480. You cannot use some look alike key purchased in a hardware store!

The straight edge of the key must be vertical with the engine, straight up and down... NOT aligned with the crankshaft taper!

Thanks Joe! I am ordering the key now. Hopefully this is the only issue and this new motor will be rippin around soon!

Cheers!

 

[James R]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

Be sure the tapers are clean and dry. There should be no trace of oil or grease otherwise the flywheel may spin on the shaft again

 

[dicarlo]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

With all this being said, does this make sense with the problem I was having? It ran and then reved up high and then died and would not restart? Also with the #3 cylinder seeming the put out smoke when I pulled the plugs? I double checked the fuel lines and carbs as well as the cooling system. Everything is good.

 

[James R]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

If the timing shifts suddenly anything may happen. Fix the thing you know needs fixing and then look at it again. Everything else is conjecture.

 

[Joe Reeves]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

With all this being said, does this make sense with the problem I was having? It ran and then reved up high and then died and would not restart?

Yep, the key sheared and allowed the flywheel to move ever so slightly, in essence allowing the timing to change (engine racing) momentarily, then finally having the flywheel move to a point where it was completely out of time (engine stops).

 

[emdsapmgr]

Re: 1980 Evinrude V4 Crossflow - Just rebuilt, NEED SOME HELP.

The factory manuals describe a process called "lapping the flywheel." Probably a good idea in your case. As Joe mentioned, surface contaminants on the crank and flywheel mating tapers can disrupt the actual flywheel torque spec. Esp on older engines. Remove the flywheel and key. Purchase some "valve lapping" compound from a local auto parts store. Put a small amount of the compound on the crank taper, and lay the flywheel on the crank. (without the key) Rotate the flywheel back and forth on the crank by hand. The compound will clean off any stains/dirt from both crank and flywheel mating surfaces-after a few minutes. Completely clean the compound off install the new key and retorque the flywheel.