metal shaving in cylinder

[Shubobo72315]

I recently found metal shaving in the 3rd cylinder on my 1990 60hp johson. I have took the motor apart and found that there was a rod bearing that failed and came apart. it has very slightly scored the cylinder wall. can I replace the bearing and rings and it work and if so do I need to replace all the cylinder bearings and rings? I was tring to find a fix without taking it to a machine shop.

 

[Mas]

Re: metal shaving in cylinder

While you have it apart, I would consider having the rest of the bores and pistons mic'ed to see if everything is still in serviceable limits and square.

If you're asking whether just replacing the bad rod bearings and asking if the motor will run...if it ran before, it will run again...but how well??

MAS

 

[tashasdaddy]

Re: metal shaving in cylinder

seeing you have gone that far, i would make sure everything was right. why do it a second time.

 

[emdsapmgr]

Re: metal shaving in cylinder

An autopsy is in order on the carb that fed the bad cylinder. Before you run it after overhaul, best to know why the failure occurred. You need to tear into the carb and have a look at the jets. Possible you have some debris in them, causing the cylinder to run lean.

 

[Shubobo72315]

Re: metal shaving in cylinder

I am rebuilding the carbs while i have them off, but I think this occured while hitting a stomp pretty hard severa years ago. the boat has been sitting for a while and had never ran right since that inccedent.

 

[R.Johnson]

Re: metal shaving in cylinder

The crankshaft, and connecting rod is also a bearing surface, what do they look like? If that bearing failed to the point it could get loose in the engine, that does'nt sound good. Is the rod face, or crankshaft surface scored, or badly discolored? Rereading your post, was it the wrist pin bearing that failed? If so, what I said above applies to the rod, and wrist pin. Just replacing the bearing is doubtful.

 

[Shubobo72315]

Re: metal shaving in cylinder

the wrist pins didn't fail, just the rod bearings and the rod was discolored some. I didn't find any scoreing on the crankshaft or the surface of the push rod.

 

[R.Johnson]

Re: metal shaving in cylinder

Which bearing failed, wrist pin, or crankshaft?

 

[Shubobo72315]

Re: metal shaving in cylinder

crankshaft

 

[iwombat]

Re: metal shaving in cylinder

You should probably have a machine shop inspect and mic the crankshaft. It's doubtful that a big end bearing could have gotten loose w/o there being some other problem. I'd replace the rod as an automatic.

 

[kenmyfam]

Re: metal shaving in cylinder

I'm with iwombat.

 

[Shubobo72315]

Re: metal shaving in cylinder

could running a wrong stator on the motor cause this proplem? I will take it to the machine shop and see what they say. do I need to know any certain thing, or will they know what do?