locking up!?

[brownhunter]

I have a 76 Johnson 6hp. it says to use 100-1 fuel mix on the side of it and this weekend. i test ran it for a buddy, it hasnt been run in a few yrs. It trolled fine for many hours, but when I went to zoom back to the ramp too see how fast it could go, after a few 100 ft, it started making a tink sound for a lil bit then stopped, so a few mins later I slowed down to troll speed again, it went a 100ft and the tink tink started then it died! tried to restart and I could barly pull the rope out, and the fly wheel was hard to move around. I got it too free up tried to start it, then locked up again after 3 pulls. I got it home today, i pulled the plugs, used my finger to feel for compression, the lower plug had barly any, so then I sprayed some wd40 in there, got it to free up and both plugs had compression. But after about 6 good pulls trying to start it, its competly locked up again and wont budge!

so whats wrong?

 

[ezeke]

Re: locking up!?

100 to 1 was rescinded by OMC many years ago. Use only 50:1.

It doubtful that the Fuel/oil ratio was the cause of the lockup because 100:1 would temporarily provide enough oil for a running motor that was in otherwise good condition.

Keep the cylinders saturated with oil, not WD-40, until you have a chance to pull the cylinder heads. Also check the cooling system and thermostat.

Click the thumbnail for a typical OMC service bulletin on the subject:

 

[brownhunter]

Re: locking up!?

how do i keep then saturated in oil, poor it in the plug holes? the motor never got hot, why would that cause it lock up?

 

[ezeke]

Re: locking up!?

What locks up is either the gearcase, which can be disconnected, or more commonly the engine, which is usually caused by lack of adequate storage lubrication or long-term wear. If the rings catch or the bearings seize, the engine won't turn.

The easiest initial inspection is through removing the cylinder head.

 

[brownhunter]

Re: locking up!?

cylinder head is what the spark plugs screw into right? lol. I'll need a new gasket if i take it off. so i didnt plow a rod/piston?

 

[icy]

Re: locking up!?

i had a 140 that had a bent shaft (not sure how it got bent but it was) in the lower unit that caused it to lockup like that. hope you fair better..

 

[ss christy]

Re: locking up!?

I had a similar problem. It turned out to be a screw that holds one of the coils on underneth the flywheel had come loose and undone, wedging up in there, therefore you couldn't move the flywheel at all really. Pull your flywheel off and see.

 

[Brianjason6]

Re: locking up!?

Are you sure it's locking up? I had a coil bolt break in my magneto once. It cuased my engine to die, the tink noise, and the bolt gettin stuck between the flywheel and coil caused my recoil/flywheel to lock. If I played with it it freed the bolt and would start back....not the best idea but I didn't have a backup... End result cost me a coil, and a new bolt.

 

[Brianjason6]

Re: locking up!?

I had a similar problem. It turned out to be a screw that holds one of the coils on underneth the flywheel had come loose and undone, wedging up in there, therefore you couldn't move the flywheel at all really. Pull your flywheel off and see.

What are the chances we both answer the same at the same time?

 

[ss christy]

Re: locking up!?

lol. with the same response

 

[Rick.]

Re: locking up!?

How do you know it wasn't over heating? Sounds to me like it was but then I wasn't there. Yes, squirt oil in the plug holes. Best of luck. Rick.

 

[jonesg]

Re: locking up!?

From when I used to run 2 cycle motorbikes the tink sound spells scorched piston.
Has it ever been decarbed?

 

[brownhunter]

Re: locking up!?

ok so i removed the cylinder head, and found these two metal peices in the lower cylinder and its frozen and the upper cylinder moves and is good. What are the metal peices? They didnt come from this side of the cylinder. What do i do now????



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[brownhunter]

Re: locking up!?

did the piston ring break apart? if so what do i do next? thanks all for helping me!

 

[restornator]

Re: locking up!?

as soon as i read 100:1 i knew it wasn't going to sound good. Those metal pieces look like they came out of a bearing assembly, probably from the lower connecting rod

 

[Tim Frank]

Re: locking up!?

ok so i removed the cylinder head, and found these two metal peices in the lower cylinder and its frozen and the upper cylinder moves and is good. What are the metal peices? They didnt come from this side of the cylinder. What do i do now????



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Are you saying that the the flywheel will turn and the upper piston moves but the lower does not?

 

[ezeke]

Re: locking up!?

You would need to tear down & rebuild the powerhead; You will need a factory manual to do it correctly, and a gasket kit, plus whatever parts turn out to be bad. You can start by studying the parts catalog for the motor: http://shop.evinrude.com/

 

[brownhunter]

Re: locking up!?

flywheel still dont move, only a lil wiggle to get the upper piston to move a bit. lower piston locked up, looks like a piece of the metal is wedged between piston and cylinder wall! theres a gap!

did the 100-1 cause this? :-(

so how hard is this going to be and about how much? should i just trash the motor?

 

[jonesg]

Re: locking up!?

They look like roller bearings or parts of.
I would buy another similar engine and keep this one for parts.
Maybe rebuild it as a project during the winter.

 

[restornator]

Re: locking up!?

like ezeke said, the 100:1 fuel mix ratio was rescinded. That is twice as lean as the modern ratio on most premixed 2-strokes