140 Evinrude - broken piston ring, piston expansion?

[Walker]

Re: 140 Evinrude - broken piston ring, piston expansion?

Yep, each chamber is isolated by rings on the crankshaft. Looks just like a large piston ring.

 

[andys15]

Re: 140 Evinrude - broken piston ring, piston expansion?

Originally posted by Walker:<br /> Yep, each chamber is isolated by rings on the crankshaft. Looks just like a large piston ring.

That's what I thought. So it could conceivably injested a reed. That'll be easy enough to get to.

 

[Walker]

Re: 140 Evinrude - broken piston ring, piston expansion?

You should be able to see all the reeds thru the front of the intake manifold. Reguardless, you need to tear the motor down for inspection.

 

[andys15]

Re: 140 Evinrude - broken piston ring, piston expansion?

Update for anyone that was interested in this thread other than me of course . I decided to pull the powerhead off the engine and dig inside. After finally splitting the case apart it turns out I have a broken piston ring which also cracked a small piece of the top of the piston off. That's what was jamming against the sparkplug. Good thing there's no damage to the cylinder wall, althought I'll hone it a bit anyway. Should be back in order in a week. Thanks for all your help and suggestions.<br /><br />Just FYI quick note. On a 1986 140 Evinrude you can't get to the connecting rod bolts via the front after taking the reed block off. There's an integral faceplate in the front half of crankcase which blocks access. The whole powerhead has to come off to split the case to get access.