Scoring on Cylinder Walls

[Solittle]

I am replacing the deflectors on one of my 1987 OMC 1.6L V4's. I notice some scoring on the cylinder walls of number 1 cylinder from the 6 oclock to 9 oclock position. The engine ran great last time out and the compression is good and within the 10%. I have also recently decarbed the motor and no heavy carbon build-up with the heads off.<br /><br />I am not looking for problems and do not want to seem a worry wart but can't help but wonder. Your thoughts??

 

[OBJ]

Re: Scoring on Cylinder Walls

Dang solittle....never like to see scoring of any kind. Can only lead to worse problems. <br /><br />How bad is the scoring? <br /><br />Don't know here buddy. If it was me, I'd fix it before it causes worse grief.

 

[The Marine Doctor]

Re: Scoring on Cylinder Walls

What is the reading on all 4 cyls? compression that is.<br /><br />TMD

 

[Hooty]

Re: Scoring on Cylinder Walls

You can take the by-pass cover off and get a partial look at the piston and ring. That may help decide what to do, if anything.<br /><br />c/6<br /><br />Hooty

 

[The Marine Doctor]

Re: Scoring on Cylinder Walls

Poster said 6-9. That cover will only show what can be seen with the head removed. 6-9 is on the exhaust side.<br /><br />"Carbon" is likely to blaim.<br /><br /> TMD

 

[Solittle]

Re: Scoring on Cylinder Walls

I don't have the compression numbers at hand but readings were taken recently and were in the 105-115 range. I haven't been inside all that many motors so it is hard to rate or compare the scoring - I can see them clearly and feel them with my finger nail. I would say moderate. Also I don't have any clue if they are new or have been that way for years. I am inclined to keep runnin it and monitor compression fairly frequently and decarbon say every six months - if it lasts that long.<br /><br />What I intend to do is look for a cheap, rebuildable motor and rebuild it myself as a spare in case this one heads south.

 

[Hooty]

Re: Scoring on Cylinder Walls

You're absolutely right TMD. I was "looking" at nr. 2cyl. Another senior moment.<br /><br />c/6<br /><br />Hooty

 

[The Marine Doctor]

Re: Scoring on Cylinder Walls

If I found a cyl with 105 with my guage at work...its rebuild time.<br /><br />TMD

 

[OBJ]

Re: Scoring on Cylinder Walls

Solittle....I'm incline to agree with TMD. You will be running the risk of really doing some non-rebuildable damage to the engine. And it can happen really quick to. Just my opinion here.